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Megachile asymmetrica (Snelling, 1990)
Chalicodoma (Chelostomoides) asymmetrica Snelling, 1990

Life   Insecta   Hymenoptera   Apoidea   Megachilidae   Megachile
Subgenus: Chelostomoides


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Identification
Extracted from: Snelling R.R., (1990). A Review of the Native North American Bees of the Genus Chalicodoma (Hymenoptera: Megachilidae). Contributions in Science, Number 421, pp. 1-39.

Male separable from all others possessing a ventral mandibular process, except C. subexilis, by the lack of a mastigion on the probasitarsus; differs from C. subexilis in having the ventral surface of the pro-coxa densely covered with abundant plumose white hairs. Female unknown.

MALE. Measurements (mm): Holotype: head width (HW) 2.75; HL 2.23; WL 5.3; total length (TL) 8.1. Paratypes: HW 2.68-2.77; HL 2.18-2.27; WL 5.1-5.2; TL 7.8-8.1.

Head about 1.2 times as broad as long; inner eye margins weakly convergent below, upper interor-bital distance about 1.1 times lower interorbital distance; in frontal view, preoccipital margin distinctly elevated above eyes and ocelli. Mandible with prominent ventral process; apex tridentate, inner tooth large, acute. Labrum normal, apex truncate, margins parallel. Clypeus weakly convex; apical margin broadly and weakly incurved, with a small median and a pair of larger submedian tubercles; disc punctures moderate, subcontiguous to contiguous, interspaces shiny; without basal or median impunctate areas. Superclypeal area similar but punctures slightly finer and largely contiguous, hence appearing duller; punctures about as coarse as those of clypeus on vertex and preocciput, becoming sub-contiguous, interspaces very weakly tessellate and moderately shiny; gena about half as wide as eye in profile, shiny between subcontiguous moderate punctures that become slightly finer and contiguous near eye margin. Pedicel about twice as long as first flagellar segment, latter broader than long; second flagellar segment about three times longer than first. Interocellar and ocellocular distances subequal and slightly greater than ocelloccipital distance.

Mesoscutum finely tessellate and slightly shiny between subcontiguous to dense moderate punc-tures; scutellum similar but slightly shinier, punc-tures contiguous to subcontiguous; metanotum tessellate and slightly shiny between irregularly spaced minute to fine punctures; mesepisternum and met-episternum slightly shiny, punctures moderate and mostly contiguous to subcontiguous, but with irregular interspaces up to a puncture diameter, especially ventrad; side of propodeum slightly shiny between mostly subcontiguous moderate punctures.

Anterior face of procoxa with numerous, long, erect, plumose, white hairs; apical process bluntly triangular, about as long as broad at base. Probas-itarsus without mastigion and about three times longer than broad; second segment of protarsus about one-third shorter and about as broad as pro-basitarsus, asymmetrical; third segment about one-third as long as probasitarsus and narrower than second; all three segments slightly concave on inner face, smooth, shiny, and bare; last protarsal segment distinctly shorter than probasitarsus.

First metasomal tergum shiny between subcon-tiguous moderate punctures; terga 2-4 shiny, punctures moderate, very variably spaced, from subcontiguous to close; tergum 5 similar but subcontiguously punctate; tergum 6 dull, contig-uously finely punctate, carina bilobate, apical margin with low, oblique lateral teeth and broad, lobelike median teeth. Exposed sterna shiny between subcontiguous moderate punctures.

Hidden sterna and genitalia as in Figures 43-46.

Piiosity mostly white and conspicuously plu-mose; sparse on clypeus except along apical margin; abundant but not wholly concealing surface on rest of face, becoming sparse on vertex-preocciput; pronotum with flocculent hairs only along margin of posterior lobe; mesoscutum without patches or band of flocculent hairs; tergum 1 with flocculent patch on each side of apical margin; terga 2-6 with basal fasciae of short, appressed, plumose hairs, weakest on 2, strongest on 5; disc of terga 5 and 6 uniformly covered with short, plumose, appressed hairs, entirely white on 5 and along midline of 6, yellowish brown on remainder of 6; sterna 1-3 with long, appressed and decumbent, white, plumose hairs, discs of 1 and 2 largely bare, 3 mostly covered but with basolateral bare areas. Clypeus, vertex-preocciput, mesoscutum and scutellum with sparse long, erect, fuscous hairs.

Color mostly blackish brown, becoming lighter on antenna, legs, and metasoma; at least tergum 6, and sometimes margin of tergum 5, somewhat fer-ruginous. Tegula dark brown. Wings clear, weakly brown, veins and stigma light brown.


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Updated: 2019-10-21 23:32:36 gmt
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