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Eucera zonata (Timberlake, 1969)
Synhalonia zonata Timberlake, 1969

Life   Insecta   Hymenoptera   Apoidea   Apidae   Eucera
Subgenus: Synhalonia


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Identification
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

Specimens of zonata that have the pubescence pale ochreous or whitish could be easily confused with actuosa, but the normal fulvous red of the thoracic pubes¬cence readily distinguishes fresh specimens. The females differ from actuosa also in larger size, less transverse head, less opaque mesonotum, and in having the white band on the second tergite set off by black hair and widely receding from apical margin across the middle. The male differs in having the labrum black and in lack¬ing the laminate keels on the sixth sternite which distinguishes actuosa.

Female.—Black; tibial spurs pale testaceous; small joints of tarsi dark, or sometimes some¬what ferruginous; claws ferruginous. Tegulae dark amber at apex, fuscous at base. Wings dusky hyaline, nervures dark ferruginous or piceous, subcosta black. Pubescence on notum of thorax typically dark fulvous or fox red, paler on face, beneath, and on tergite 1 of abdomen, but sometimes ochreous on only slightly worn specimens. Hair on tergites 2 to 5 black, with white apical bands on tergites 2 to 4; band on tergite 2 arcuate and receding from apical margin across middle of segment; long hairs overhanging the bands, pallid on tergite 2 and dusky on tergites 3 and 4. Black hair at base of tergites 2 to 4 thinly interspersed with appressed short hairs that glisten palely by reflected light. Apical band on tergite 5 brown on middle third and white on each side. Hair on tergite 6 brown or black. Ventral fringes of abdomen ochreous or whitish, but fulvous across middle of sternite 5 and tinged with fulvous on middle of sternite 4. Hair of legs ochreous, but bright ferruginous on inner side of middle and hind basitarsi and brown on outer side of middle tibiae.

Head much broader than long; inner orbits of eyes parallel; facial quadrangle distinctly broader than long. Vertex only slightly impressed on each side; lateral ocelli slightly more than their distance apart from nearest eye and their diameter from occipital margin. Proboscis moderately long; galeae narrow, tapering, partly shining and with sparse, very short hairs. Second submarginal cell receiving recurrent nervure about one-fifth of its length from apex. Clypeus finely and densely rugoso-punctate. Frons and vertex dull, but rather shining in some lights, and finely and densely punctured. Mesonotum dull, punctures of scutum small, rather obscure, but close, and those of scutellum more distinct and dense. Abdomen minutely and densely punctured, but sculpture mostly concealed by dense pubescence except on tergite 1 and on middle of apical half of tergite 2; apical depression of tergite 1 bare and impunctate, as is also apical half of depression of tergite 2 except far to each side. Pygidial plate about as long as wide at base, with apex generally rather broadly rounded; disk plane. Length 12-14 mm, anterior wing 8-8.4 mm, width of abdomen 4.5-5 mm.

Male.—Black; tibial spurs testaceous; small joints of tarsi brown or more or less ferruginous; claws ferruginous. Tegulae and wings as in female. Labrum black (in one paratype with a yellow median streak). Clypeal mark pale yellow, widely separated from margin of eyes, about one-third broader than long, hardly emarginate on convergent sides and more or less rounded at summit; margins of clypeus dark all around, broadly on each side, narrowly at summit, and with apex narrowly testaceous or sometimes more broadly dark and partly black. Pubescence of head and thorax fox red as in female, but varying to ochreous or whitish in some specimens. Hair of tergite 1 very long, erect, and strongly tinged with fulvous red in bright-colored specimens. Hair of tergite 2 about one-half as long as longest hair of tergite 1, and colored nearly the same, but becoming more or less dusky or black across apical margin. Tergites 3 to 7 with black hair, partly as long as hair of tergite 2, but with mixture of shorter and more plumose hair. Hair across apex of tergite 6 and on tergite 7 sometimes brown. Long fringes on lateral margins of venter ochreous, but shorter hair across middle of sternites 4 and 5 more or less fulvous. Hair of legs pale fulvous, varying to whitish, but ferruginous on inner side of middle and hind basitarsi.

Head much broader than long; inner orbits somewhat divergent above. Vertex moderately well impressed on each side; lateral ocelli about their distance apart from nearest eye and their diameter from occipital margin. Oculoclypeal space very narrow. Antennae slender, reaching base of tergite 2 (in small specimens reaching apex of tergite 4), flagellum moderately com¬pressed; joint 3 about one-third as long as joint 4. Proboscis and second submarginal cell as in female. Legs normal, middle basitarsi longer than tibiae. Hair of face much longer and denser than usual, and labrum with long, dense hair. Clypeus dullish, closely, shallowly, and rather obscurely punctured. Frons dull, densely and finely punctured. Mesonotum opaque, punctures close but obscure on scutum and denser on scutellum. Abdomen dullish, minutely and densely punctured, with apical margin of tergites only very narrowly bare and impunctate. Sternite 6 rather broadly and moderately well impressed on each side without formation of distinct marginal lobes; inner margin of impression forming low, elbowed ridge, distal arm of which parallels lateral margins of plate for a short distance; disk shining, with very short, erect hair at base, and short, fine submarginal hair on each side of apical margin. Sternites 7 and 8 as figured; sternite 7 testaceous, but slender subapical spines on outer face black. Parameral lobes of genital armature slender, strongly arcuate, moderately widened at base and only slightly widened at rounded apex; outer surface with long pale hair except on apical expansion. Length 9.5-12 mm, anterior wing 8-8.5 mm.


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