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Ashmeadiella occipitalis Michener, 1939
Life   Insecta   Hymenoptera   Apoidea   Megachilidae   Ashmeadiella
Subgenus: Ashmeadiella


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Overview
Species account taken from: "A Revision of the Genus Ashmeadiella (Hymen., Megachilidae) Author(s): Charles D. Michener Source: American Midland Naturalist,Vol. 22, No. 1 (Jul., 1939), pp. 1-84"


This large, robust, black species is easily recognized in both sexes by the polished and sparsely punctate vertex. Other species having a similar appear- ance such as maxima and opuntiae, have the median teeth of the sixth tergite of the male long. In the present species these' teeth are but little longer than broad.


Female: Inner margins of eyes converging toward clypeus; transfacial line a little Ionger than facial; flagellum dusky beneath; sides of face densely cov- ered with pubescence; truncation of clypeus slightly concave, as lonlg as dis- tance from end of truncation to lateral angle of clypeus; punctures of anterior edge of clypeus, just basad to the rather broad impunctate margin, fine and close; mandibles with dorsal carina of anterior margin ending somewhat nearer to anterior than to posterior basal angle of mandible; distance from first to third tooth of mandible somewhat shorter than width of eye, nearly as long as last three antennal segments together; cheeks as wide as eyes seen from side, distinctly more finely punctate than vertex; anterior ocellus a little anterior to midpoint between antennal sockets and edge of vertex; distance from posterior ocellus to edge of vertex considerably greater than to eye, the latter distance a little greater than distance between ocelli; punctures of head and thorax, except for propodeum and anterior part of clypeus, coarse and separated by shiny ground; vertex behind ocelli with broad, shiny area with few punctures; scutum with pair of pubescent spots anteriorly; scutum some- what more coarsely punctate than vertex, disc, except for median line, more sparsely punctate than elsewhere, the punctures being often separated by more than their diameters; punctures of mesepisterna about same size as those of vertex; punctures of scutellum finer than those of scutum and much sparser; wings clear; inner margin of inner hind tibial spurs with about fifteen small teeth, outer margin with about ten large teeth; inner margin of outer hind tibial spurs with about six small, rather oblique, teeth, outer margin with about nine smaller, oblique teeth. Punctures of dorsum of first four abdominal ter- gites a little finer than those of scutellum, those of elevated portions of ter- gites separated by more than their diameters; punctures of sides of tergites and of- fifth and sixth tergites as coarse as those of scutum and close together; tergites with white apical bands of pubescence, that of fifth tergite weak; sixth tergite slightly pruinose; scopa dull white; sixth sternite produced later- ally as a lamella on each side. Length a little over 9 mm.


Male: Transfacial line distinctly longer than facial; under side of flagellum dusky; eyes converging below; apical margin of clypeus with slight concavity considerably shorter than basal width of clypeus; cheeks about half as wide as eyes seen from side; anterior ocellus about midway between antennal bases and posterior edge of vertex; distance between posterior ocelli less than dis- tance to eye, which distance is less than distance to posterior edge of vertex; punctation similar to that of female but a little finer, punctures of cheeks and mesepisterna more nearly the same size; scutellum a little more finely and closely punctate than scutum; abdomen, especially laterally and posteriorly, more finely punctate than in female; raised portion of dorsum of second tergite with punctures separated by their diameters, punctures of first, fourth, fifth, and sixth tergites closer; lateral teeth of sixth tergite rather large and acutely pointed; median teeth dusky, obliquely truncated, a little broader than long, concavity between them a semicircle. Apical segment of each tarsus rufescent; inner margin of inner hind tibial spur finely serrate with about twenty teeth, those of basal part being longer than basal width, outer margin with about twelve teeth, the basal three and apical few of which are small; inner margin of outer hind tibial spur with about five, rather oblique teeth, outer margin with about nine, rather small teeth; tegulae faintly rufescent. Pubescence as in female but much more abundant on face; no apical band of pubescence on fifth tergite. Length 7 to 8 mm.


Holotype female (Calif. Acad. Sci., Ent. No. 4726), allotype male (Calif. Acad. Sci., Ent. No. 4727) and a paratype of each sex from Sabino Canyon, Santa Catalina Mountains, Arizona, August 13, 1924 (E. P. Van- Duzee). Paratypes, all from ARIZONA: two females, Sonorita, August 5, 1924 (J. 0. Martin, E. P. VanDuzee); one female, Baboquivari Mountains, August 18, 1924 (0. C. Poling); two females, Pepper Sauce Canyon, Santa Catalina Mountains, August 15, 1924 (E. P. VanDuzee). Two paratypes are in the author's collection, the rest in the collection of the California Academy of Sciences. An additional specimen of this species is from El Paso, Texas, April 6, 1902 (Acad. Nat. Sci. Phila.)

Names
Scientific source:

Supported by

Hosts · map
FamilyScientific name @ source (records)
Asteraceae  Baccharis brachyphylla @ UCRC_ENT (2)

Baccharis sp @ BBSL (1)

Baileya pleniradiata @ AMNH_BEE (1)

Baileya sp @ BBSL (2)

Dieteria canescens @ UCRC_ENT (2)

Erigeron sp @ BBSL (1)

Heterotheca subaxillaris @ UCRC_ENT (1)

Heterotheca @ UCRC_ENT (3)

Hymenothrix sp @ BBSL (3)

Hymenothrix wislizeni @ BBSL (1); UCRC_ENT (1)

Machaeranthera gracilis @ UCRC_ENT (1)

Senecio sp @ BBSL (3)

Verbesina encelioides @ UCRC_ENT (21)
Cactaceae  Opuntia sp @ BBSL (1)
Euphorbiaceae  Euphorbia albomarginata @ AMNH_BEE (1)
Fabaceae  Melilotus officinalis @ AMNH_BEE (7)
Malvaceae  Gossypium sp @ BBSL (1)

Sphaeralcea sp @ BBSL (2)
Polygonaceae  Eriogonum @ UCRC_ENT (3)
Scrophulariaceae  Penstemon sp @ BBSL (1)
Zygophyllaceae  Kallstroemia grandiflora @ BBSL (1)

Larrea tridentata @ BBSL (1)
_  Withheld @ BBSL (14); BBSL__CAVE (1)

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Updated: 2024-03-28 13:20:07 gmt
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