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Eucera quadricincta (Timberlake, 1969)
Synhalonia quadricincta Timberlake, 1969

Life   Insecta   Hymenoptera   Apoidea   Apidae   Eucera
Subgenus: Synhalonia

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Extracted from: Timberlake P.H., (1969). A Contribution to the Systematics of North America Species of Synhalonia (Hymenoptera, Apoidea). University of California Publications in Entomology Volume 57

The female of quadricincta may be recognized by the unusually dense pubes¨cence and by the four broad white bands of the abdomen. The male is similar to primiveris but has denser pubescence, and the middle tibiae and basitarsi are nearly normal in structure. The characters separating it from the male of albescens are given in the key.

Female.óBlack; small joints of tarsi and base of claws dusky ferruginous; tibial spurs testaceous. Sometimes a small yellow spot on anterior middle of clypeus. Flagellum of antennae dark ferruginous beneath. Tegulae amber on apical half. Wings dusky hyaline, nervures dark ferruginous to piceous, subcosta black. Pubescence moderately long and unusually dense on cheeks and mesonotum, ochreous above and whitish beneath and on face. Tergite 1 with moder¨ately long, erect white hair, and a patch of appressed white tomentum on each at apex. Tergites 2 to 5 with short, dense black hair at base and broad apical white bands, that on tergite 2 narrowly receding from margin across the middle and that on tergite 3 receding only slightly. Band on tergite 5 with its apical half tinged with pale brown across middle. Hair of venter whitish, but chocolate brown across the middle of sternite 5 and on sternite 6. Hair of legs mostly whitish, but scopal hair of hind legs ochreous, and hair on inner side of front and middle basitarsi bright ferruginous.

Head much broader than long; inner orbits of eyes parallel. Vertex only slightly impressed on each side; lateral ocelli their distance apart from nearest eye and a little more than their diameter from occipital margin. Proboscis moderately long, galeae minutely tessellate, moderately shining, and nearly hairless. Second submarginal cell receiving recurrent nervure generally less than one-fifth of its length from apex. Clypeus moderately shining, closely punctured, with fine, mostly longitudinal ridges between punctures. Frons shining, with close, fine punctures. Meso¨notum shining, finely and densely punctured, but sculpture concealed by dense, finely plumose hair. Abdomen densely pubescent, with sculpture concealed; apical depression of tergite 1 broadly bare and impunctate across middle and that of tergite 2 narrowly bare. Pygidial plate narrowed more than one-half to rather narrowly rounded apex. Length 13-14 mm, anterior wing 8.8-9 mm, width of abdomen, 5.6-5.8 mm.

Male.óBlack; small joints of tarsi ferruginous brown; apical half of claws red; tibial spurs testaceous. Labrum, clypeus, triangular supraclypeal mark, and sometimes small spot on base of mandibles creamy white; clypeal mark reaching close to margin of eyes arid squarely notched on each side. Tegulae and wings about as in female. Pubescence dense and ochreous above on thorax, paler beneath and on face. Hair of abdomen long and erect on tergite 1, and short, inter¨spersed with longer, erect hair on following segments, mostly white or with white bands on tergites 3 to 6, and black at apex of tergite 2 and broadly black at base of tergites 3 to 6, the white band on tergite 3 and sometimes also that on tergite 4 followed by a row of black hairs. Hair of venter and legs mostly white, but ferruginous on inner side of middle and hind basitarsi.

Head much broader than long; inner orbits of eyes somewhat divergent above. Vertex slightly impressed on each side; lateral ocelli a little less than their distance apart from nearest eye and their diameter from occipital margin. Oculoclypeal space very narrow. Antennae reaching apex of tergite 2, flagellum moderately slender, strongly compressed; joint 3 on its short side slightly more than one-third as long as joint 4. Legs almost normal, middle tibiae flattened beneath, anterior margin of outer face slightly concavely arcuate in the apical two-thirds, with under surface partly hairy. Clypeus shining, with fine, shallow, and moderately close punctures. Meso-notum moderately shining, with fine, dense punctures. Abdomen dullish, minutely and densely punctured; smooth apical margin of tergites narrow. Sternite 6 with strong longitudinal impres¨sion on each side toward base, terminating in a low, rounded marginal lobe, and bounded within by a low ridge, which is elbowed inward to parallel lateral margin for short distance; disk with patch of short, dense, fuscous hair on each side of base and submarginal row of hair beyond impressed area. Sternites 7 and 8 as figured. Parameral lobes of genital armature less slender than usual, gently arcuate, broad at base, and constricted one-half before the expanded truncate apex; outer face of basal half with short, erect, thin hair. Length 12-13 mm, anterior wing 8.5-9.5 mm.

Scientific source:

Supported by

Hosts · map
FamilyScientific name @ source (records)
Apocynaceae  Cycladenia humilis @ BBSL (2)
Asteraceae  Baileya sp @ BBSL (3)
Berberidaceae  Berberis fremontii @ BBSL (1)
Brassicaceae  Chorispora tenella @ BBSL (1)

Thelypodium laciniatum @ BBSL (1)
Fabaceae  Astragalus sp @ BBSL (5)

Melilotus officinalis @ BBSL (1)
Hydrophyllaceae  Phacelia palmeri @ BBSL (1)
Onagraceae  Oenothera sp @ BBSL (2)
Papaveraceae  Arctomecon californica @ BBSL (5)

Arctomecon humilis @ BBSL (22); BBSL__LMNRA (1)

Arctomecon merriamii @ BBSL (2)
_  Withheld @ BBSL (34); BBSL__LMNRA (1)

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Updated: 2024-06-20 18:11:48 gmt
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