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Notes on N. sphaerogaster. Mitchell's original description of this species mentions only the type. I have seen or been in correspondence with people with pictures regarding possible additional specimens from Michigan (almost certainly) and Florida (likely, though it has been a while and included males). I compared 2 specimens collected by Bequeart (no date!) from Northern New Jersey and a specimen from April 27, 1901 from Dane County, Wisconsin collected by S. Graenicher.
Here are some identification notes: Clypeus longitudinally short compared to other specimens and with prominent but scattered long light brownish hairs (can be hard to see the brown) that are slightly taller than the matrix of bright white more plumose hairs, these hairs extend onto the labrum; Mandibles relatively large and thick and angle downwards following the margin of the labrum rather than crossing in front of it; Clypeus with blotchy yellowish to brownish markings that are extensive but in the 3 specimens these blotches don't fully reach the upper margin; Light markings circle the compound eyes but are often so faint as to be absent, in places they are muddy, poorly defined blotchy yellowish, ochre, to slightly dark reddish; Scutellum is pillow-like with no clear division or depressed area in the center, complete extensive yellow mark on 2 specimens, but does not reach the edges of the scutellum and in one specimen they are more restricted and form two large yellow patches; Hind tibia with 5 or so thick setae about as long as the surrounding usual white hairs, setae well spaced out; T5 almost completely yellow except for a brownish cut out on the sides; T5 with a very thin white pseudopygidial area.; Two small yellow dots present at the far sides of the propodeal triangle appear to be diagnostic
Reprinted with permission from: Mitchell, T.B. 1962 Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 152.
FEMALE�Length 8 mm.; lateral ocelli considerably nearer margin of vertex than to eyes; cheeks subequal to eyes in width; longer side of basal segment of flagellum shorter than segment 2, median segments very slightly longer than broad; clypeus very short, median length only about a fourth the breadth, with erect, dark hairs; mandibles simple; wings slightly infuscated, veins testaceous to brownish, stigma somewhat darker, 3rd submarginal cell narrower than 2nd anteriorly, basal vein very slightly basad of transverse median; tegulae yellow, shining, sparsely and minutely punctate; scutellum not grooved; front coxae not spined; apex of hind tibiae with a row of four or five rather short, brownish setae; head and thorax black, the labrum, mandibles except tips, clypeus, and very short lateral maculations, yellow; antennal scape yellowish anteriorly, flagella testaceous beneath, brownish above tubercles and a pair of blotches on scutellum, bright yellow; propodeum with a pair of very small, yellow spots triangle; abdominal terga black, 1-4 with transverse yellow bands, interrupted medially except on 2 which is only subinterrupted, largely yellow; legs black basally, the femora apically and all tibia and tarsi, yellow; head and thorax finely rugoso-punctate, but clypeus very minutely punctate; abdominal terga very minutely and quite closely punctate, rims narrowly impunctate; pseudopygidium short, of the usual form; pubescence of head and thorax quite copious and erect, but rather short, pale yellowish above, more whitish laterally and beneath; abdominal terga with only very short, thin and obscure pale pubescence.
TYPE LOCALITY � Riverton, N. J., 4-22.
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Identification | |
Extracted from: Cockerell, T.D.A. (1905). Some bees of the Genus Nomada from Wisconsin. The Canadian Entomologist pp. 189 - 191.
Female. Length, about 8 mm.; black, with lemon-yellow markings, and some red, but none on thorax;
mandibles and anterior coxae simple; basal nervure passing a short
distance based of transverso-medial; third antennal joint a little shorter
than fourth. Head and thorax coarsely roughened, and quite hairy, the
dorsal hair tinged with fuscous j head broad, facial quadrangle much
broader than long; no yellow about head, cheeks entirely black; labrum,
mandibles, malar region, broad anterior margin of clypeus, and a minute
inconspicuous stripe on each side of face adjacent to eye and small spot
at summit of eye, all ferruginous; antennae entirely ferruginous, suffused
with blackish above, except the third joint; upper border of prothorax,
most of tubercles, and two large confluent spots on scutellum, yellow; the
rest of the thorax is black; sides of metathoracic area with conspicuous:'
grooves; legs black to about the middle of the femora (more behind), and
beyond that red, the middle and hind tibiae with a blackish streak behind,
the knees inclined to be yellowish, the hind tibia! with a yellow stripe on outer edge, and the middle tibiae with faint indications of an apical yellow
spot; abdomen very broad, black with yellow bands, that on first segment
broadly interrupted, on second to fourth broad at 5ides, and narrowed or
slightly interrupted in the middle, on fourth notched behind laterally;
fifth segment yellow, with the base, and a round spot on each side, b1ack ;
venter dark reddish, irregularly banded with lighter, and with a little
yellow.
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Updated: 2024-04-24 14:06:58 gmt
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