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Sphecodes antennariae Robertson, 1891
Dialonia antennariae (Robertson, 1891)

Life   Insecta   Hymenoptera   Apoidea   Halictidae   Sphecodes
Subgenus: None

Sphecodes antennariae, F, back, Cecil Co., Maryland
© Copyright source/photographer · 5
Sphecodes antennariae, F, back, Cecil Co., Maryland

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    Note: In addition to only having 2-submarginal cells, the female of this species is tiny, has a yellow cast to its abdomen and its clypeus is noticably compressed longitudinally and wide latitudinally.
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Sphecodes antennariae, F, side, Cecil Co., Maryland
© Copyright source/photographer · 5
Sphecodes antennariae, F, side, Cecil Co., Maryland
Overview
Reprinted with permission from: Mitchell, T.B. 1960 Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 141.

FEMALE-Length 4 mm.; head and thorax black above, becoming more or less ferruginous beneath, abdomen ferruginous basally, becoming piceous apically; head much broader than long, length about three-fourths the breadth; clypeus flat, very broad and short, apical margin about level with the suborbital line; labrum testaceous, broadly rounded, with a rather pronounced, median groove toward apex; mandibles simple, elongate and slender, testaceous basally, becoming piceous at tips; basal segment of flagellum very slightly broader than long, shorter than pedicel, 2nd and following segments slightly longer; space between lateral ocrelli considerably less than that between ocelli and eyes; wings subhyaline, veins and stigma brownish-testaceous, with but two submarginal cells; tegulae kstaceous- hyaline; face above antennae smooth and shining, punctures very fine but deep and distinct, well separated, interspaces slightly exceeding diameter of punctures, those below antennae becoming more minute, more widely separated and obscure, becoming quite shallow, sparse and obscure on clypeus; vertex punctured about as upper part of face, cheeks shining, punctures hardly visible, becoming shining and polished below; scutum and scutellum shining, punctures minute and quite widely separated but distinct, more sparse on scutellum, pleura rather dull, finely roughened, dorsal area of propodeum rather coarsely striate, its length about equal to that of scutellum, lateral faces somewhat shining, obscurely striate posteriorly; basal abdominal terga shining, tergum 2 with rather close but very minute punctures across base, becoming impunctate toward the apical margin, which is rather broadly yellowish-hyaline, terga 3 and 4 more fully punctate, punctures rather close and very minute, apical margins quite broadly yellowish-hyaline.

MALE-Length 4 mm.; head and dorsum of thorax black, thorax laterally more brownish- piceous, abdomen brownish-testaceous basally, becoming black apically; head only slightly broader than long; eyes very slightly convergent below; clypeus quite strongly flattened; mandibles testaceous, tip reddened, base more piceous; antennae dark basally, Aagellum pale testaceous beneath, somewhat more brownish above, length and breadth of segments subequal, but 1st and 2nd very slightly shorter; lateral ocelli slightly nearer each other than to eyes; lower portion of face somewhat obscured by pubescence, but punctures barely visible, fine, rather close along inner orbits and on supraclypeal area, somewhat more sparse on clypeus, those above antennae fine, distinctly separated but rather close, interspaces shining; vertex somewhat shining between eyes and ocelli, punctures minute but quite distinct, rather close, hind margin becoming obscurely roughened; cheeks above somewhat shining, very minutely and obscurely punctate; wings subhyaline, with but 2 submarginal cells, veins and stigma brownishtestaceous; tegulae yellowish-hyaline; legs brownish-testaceous, tarsi somewhat more yellowish; scutum and scutellum shining, punctures exceedingly minute and indistinct, rather widely separated in center of scutum, becoming somewhat closer toward sides, those on scutellum well separated but hardly sparse; pleura rather smooth, only obscurely rugose anteriorly; dorsal area of propodeum rather broad, with a few fine and more or less incomplete striae, lateral faces dull but rather smooth, posterior face with a few inconspicuous striae; abdominal terga smooth and shining, basal tergum with a few scattered, minute punctures across middle, 2 and 3 very finely and rather closely punctate basally, punctures becoming somewhat more sparse toward the yellowish-hyaline, narrowly impressed, apical margins which are entirely impunctate; gonostyli (fig. 113), quite small, bare, slender, slightly constricted at base, only slightly exceeding penis valves.

DISTRIBUTION-Wisconsin and Michigan to North Carolina; July to September.

FLOWER RECORDS-Robertson (1929) records antennariae on Antennaria plantagenifolia, Aster ericoides and Pycnanthemum f lexuosztm.


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Updated: 2024-03-28 10:47:10 gmt
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