This species is restricted to the southwest of the USA and north of Mexico. The genus is only present in Nearctic and Neotropical regions. Although not as diverse as other genera only 12 species , specimens from some species are abundant in the field. Heterostylum robustum was previously known from Coahuila and was collected during this study. This species is distributed from Canada to central Mexico. There are two revisions for this genus that contains identification keys, one by Hall and Evenhuis and the more recent by Cunha et al. Figure 4. Heterostylum croceum , female CNIN a dorsal view b lateral view.
Heterostylum croceum is recorded for the first time in Mexico; previously known from the southern-central United States.
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Hall and Evenhuis suggest that Heterostylum croceum may be related to Heterostylum engelhardti Painter, or even be a subspecies of that taxon, Heterostylum croceum is the eastern form and Heterostylum engelhardti the western form Arizona, California, Texas, Utah although both species are present in Texas. Cunha et al. Most of the 29 species in this exclusively Nearctic genus are distributed in the southwest of the USA and north of Mexico, although eight species are present in the northwest of the USA Lordotus apicula Coquillet, ; Lordotus bipartitus Painter, ; Lordotus diversus Coquillett, ; Lordotus gibbus Loew, ; Lordotus miscellus Coquillett, ; Lordotus pulchrissimus Williston, ; Lordotus striatus Painter, ; Lordotus zona Coquillett, The three species present in Coahuila are also found in California; their distribution probably includes all northern states of Mexico.
Hall and Hall and Evenhuis present reviews of the genus and keys to the species. Figure 5a, b. Figure 5c. Figure 5d, e.
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Lordotus perplexus has the most southern distribution in the genus, reaching Sinaloa on the Pacific coast. Four species of Triploechus are present in Nearctic region: Triploechus luridus Hall, ; Triploechus novus Williston, ; Triploechus sackeni Bigot, ; Triploechus stagei Hall, Of these Triploechus stagei is endemic to Mexico and Triploechus novus has the widest distribution of this genus, being present in the south of the USA and center of Mexico. Hall and Evenhuis present a revision and key for species for this genus.
Figure 6. Triploechus novus , female CNIN dorsal view.
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Scale bar: 3 mm. This is a widespread and apparently common species. All specimens were collected in April so it may have a short flight season.
The only two species in this genus have been collected from the neotropical part of Mexico to north of the USA and Canada. Ogcodocera leucoprocta Wiedemann, , not sampled during this study, is present in the whole Nearctic region from Canada to south of Mexico. Figure 7. Ogcodocera analis , male CNIN dorsal view. This record is the first of this species in the north of Mexico, but it has been previously collected in the south of Mexico and in the south of USA, and thus is probably distributed across the whole country.
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Unlike Ogcodocera leucoprocta , Ogcodocera analis has its most northern distribution in Arizona and Texas. All five extant species of Paracosmus have Nearctic distributions, and all are present in California. Two of these species have been collected in the northwest of Mexico Paracosmus Actherosia rubicundus Melander, and Paracosmus Paracosmus morrisoni Osten Sacken, Figure 8. Paracosmus Paracosmus morrisoni has the widest distribution within this genus, but in Mexico had previously only been recorded in Sonora. This record represent the most eastern distribution for the genus in the country.
This is a diverse genus with species worldwide. Two old but complete revisions of the genus, including distribution maps and keys, were made by Marston , Thanks to these Anthrax species can be easily identified. Some Anthrax species are widely distributed occupying two biogeographic regions. From the seven Anthrax species collected in this study in Coahuila, just Anthrax cybele Coquillett, has a restricted distribution. The other six species are widespread across the Nearctic region. Two species of Anthrax are reported for the first time for Mexico.
Figure 9a. Anthrax part I. Megachile gentilis Cresson Megachilidae. Figure 9b. This is a rare species flying in April. Its distribution is disjunct so far, present in the southwest of the USA and northeast of Mexico. Figure 9c. The range of Anthrax georgicus includes all North America and Central America Nicaragua, Costa Rica covering a wide diversity of habitats and environmental conditions.
Common in the rainy season and present in the dry season March , this species is probably present in most if not all states of Mexico, but has only been collected in eight of them.
Figure 9d. More abundant than its congener, this species has been collected in 15 states in Mexico including Oaxaca of the Neotropical region not listed above and all regions of the USA. Anthrax irroratus should be collected in any systematic, long term Bombyliidae sample in Mexico and the USA.
Figure 10a. Anthrax part II. Apparently closely related to Anthrax irroratus , Anthrax oedipus has a narrow distribution in the Nearctic region but is widely distributed in all South America. In the USA it has been collected only in two southern states, while it occurs in most of the northern states of Mexico and one central state Morelos ; it may be present in most areas from Texas to Argentina. Figure 10b. With just two specimens collected, Anthrax pauper appears to be a rare species in this region.
This population is the most southern recorded of this species, mostly present in the center and east of the USA. Presumably adapted to colder climates, it is no coincidence that it was collected in the most elevated site sampled. Figure 10c. This species is recorded mostly from the south of the USA and north of Mexico, but its presence in Puebla in central Mexico suggests a wider distribution within the country, at least in all northern states.
Dipalta is a small genus with just two species. Figure Dipalta serpentina , male CNIN dorsal view. Myrmeleon immaculatus De Geer Myrmeleontidae. This species is probably present in all of Mexico, but this is the only record in the north of Mexico. Hemipenthes is equally diverse in the Nearctic 29 species , Neotropical 26 species and Palearctic 37 species regions, with just six species in the Oriental region and one in the Afrotropical region. Four species of this genus were collected in Coahuila. All of these have broad distributions but apparently from poor sampling because records are not continuous, especially in Mexico.
Figure 12a. This record is the most eastern record in Mexico. Figure 12b. This species is abundant in the rainy season in most of the Nearctic region but has not been collected in many states of Mexico or the USA where it probably is present. Figure 12c. Males of this species are abundant all year long but females are unknown. There is no explanation for this lack of females in the collections.
Extreme sexual dimorphism and misidentification of females can be dismiss, since there is no Hemipenthes species from which only females are known.
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One possible explanation is that females life span is too short and therefor encounter probabilities are low. Distribution is discontinuous with populations present in central and northern Mexico and the southern USA; it is unknown whether this species is present in between these areas. Figure 12d. Neodiprion sertifer Geoff.
Hemipenthes sinuosa is only known from Morelos in the center of Mexico and Coahuila in the northeast, but can be found almost in all of the USA. It is clearly undersampled in Mexico.
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Forty seven of the 52 species of Lepidanthrax are from the Nearctic region. Hall published a revision of this genus including keys for species. Figure 13a. Lepidanthrax arizonensis has a restricted distribution, being present only in Arizona and Coahuila, but probably is also present in Chihuahua, Texas and New Mexico. Figure 13b. The distribution of Lepidanthrax disiunctus has its northern extreme in Arizona and its southern extreme in Oaxaca, in the southeast of Mexico.
It seems this species is rarely collected, but widely distributed. Figure 13c. Figure 13d. Lepidanthrax hyposcelus is endemic to Mexico, previously only known from the southwest of the country; this record extends its distribution to the northeast of the country. Figure 13e.
Lepidanthrax proboscideus , Lepidanthrax fuscipennis Hall, and Lepidanthrax disiunctus are the only species of this genus distributed in both the Nearctic and Neotropical regions. Of these Lepidanthrax proboscideus extends as far as El Salvador, the most southern distribution for a Nearctic species of this genus. This is the first record of this species in the northeast of Mexico.
Neodiplocampta is a small American genus, more diverse in the Neotropical than the Nearctic region. Hull and Martin described seven of the 16 species and published a key for all species of the genus. Neodiplocampta Neodiplocampta miranda and Neodiplocampta Agitonia sepia Hull, are the only two species distributed in both biogeographic regions Nearctic and Neotropical.