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Eucera angustifrons (Timberlake, 1969)
Synhalonia angustifrons 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

S. angustifrons is very distinctive in having the eyes convergent above, strongly in the male and only slightly in the female. The males have the habit of a constant hovering flight, back and forth between two points, at a nearly uniform level above the ground, and they are about as often seen and captured while in flight as when visiting flowers.

Female.—Black; small joints of tarsi and claws slightly reddened; tibial spurs pale testaceous. Clypeus sometimes with a transverse yellow mark on anterior part of disk. Pubescence erect, moderately dense, but not concealing surface, ochreous or fulvo-ochreous on thorax, and longer and paler beneath and on cheeks. Hair of abdomen pale ochreous or white, but black on disks of tergites 4 and 5, and often at base of tergite 3. Light hair on tergites 3 and 4 forming broad dense bands across apical depression, with additional bands across disk of tergite 3, which is broadly confluent with apical band in middle but more or less separated on each side; or tergite 3 sometimes entirely covered with light hair, although more thinly across middle of disk. Band on tergite 4 sometimes triangularly widened to extend forward to middle of disk. Margin of disks of tergites 2 to 4 just before apical depression with many long, erect black hairs, and shorter, erect dark hairs scattered over disks. Apical band on tergite 5 dark chocolate brown in middle, with outer fourths white. Apical fringes of venter long and white, denser at outer ends, and mostly brown on sternite 5. Tegulae piceous, and reddish brown at apex. Wings moderately dusky, subcosta black, other nervures tinged more or less with red.

Head somewhat wider than long; inner orbits distinctly convergent above although only slightly in comparison with conditions in male. Vertex moderately impressed on each side. Lateral ocelli about their distance apart from nearest eye and one-half as far from occipital margin. Flagellum of antennae more nodose at articulations than usual. Second submarginal cell receiving recurrent nervures about one-fifth to one-fourth of its length from apex. Pygidial plate broad at base, nearly plane, and narrowed one-half or more to rounded apex. Clypeus closely, subrugosely punctured, ridges between punctures more or less shining, sometimes a median ridge more or less distinct. Head otherwise and thorax rather dull, with fine, close, shallow punctures; middle of mesoscutum slightly more shining, with punctures almost uni¬formly about one puncture width or less apart. Apical margin of tergites 1 and 2 narrowly bare and impunctate. Length 13-15 mm, anterior wing, 9.5-10.5 mm, width of abdomen 5.3-5.6 mm.

Male.—Colored like female, but labrum and clypeus yellow; sometimes small supraclypeal mark present. Clypeal mark almost touching margin of eyes and squarely notched on each side. Pubescence of head and thorax rather short and dense, pale ochreous to ochreous-brown above and paler beneath. Hair of abdomen short, erect, with longer hairs interspersed on apical segments, but uniformly short on tergite 2 and long on tergite 1. Hair of tergite 1 and on basal half of tergite 2 pale ochreous or whitish, with some hair on apical margin of tergite 1, that on apical half of tergite 2 (sometimes extending to base in middle) and on following segments black. Appressed plumose hair on apical depression of tergites 3 to 5 more or less white and forming narrow bands, more or less interrupted, evanescent, or absent, and best developed on tergite 5. Hair of venter mostly black on sternites 4 and 5 and other¬wise whitish. Hair of legs light, but ferruginous on inner side of tarsi.

Head broader than long, with eyes unusually large, inner orbits strongly convergent above. Vertex strongly impressed between ocelli and margin of eyes. Lateral ocelli about their diameter from nearest eye. Antennae reaching almost to apex of tergite 1, with flagellum slender, somewhat clavate, moderately compressed, joints slightly widened at articulations; joint 3 longer than scape and pedicel combined and about three-fourths as long as joint 4. Clypeus shining, with moderately close, fine punctures. Oculoclypeal space narrow. Head and thorax dullish, with fine, close, shallow punctures. Legs normal, but slender and elongate. Sternite 6 smooth, shining, with shallow median impression; lateral impressions rather small, somewhat oblique, terminating at margin without formation of lobes, bounded within by weak ridge, which is hardly continuous with weak submarginal ridge on each side of apical margin; disk with very short fine hair on each side of base and some submarginal hair on each side of apical margin. Sternites 7 and 8 as figured. Parameral lobes of genital armature slender except for being very broad at base and dilated at truncate apex. Length 11-15 mm, anterior wing 8.5-10 mm.


Names
Scientific source:

Supported by

Hosts · map
FamilyScientific name @ source (records)
Fabaceae  Parkinsonia aculeata @ BBSL (12)
Hydrophyllaceae  Phacelia sp @ BBSL (1)
Ichneumonidae  Isomeris arborea @ BBSL (1)
Lamiaceae  Salvia sp @ BBSL (1)
Scrophulariaceae  Penstemon palmeri @ BBSL (1)
Solanaceae  Solanum sp @ BBSL (6)
Zygophyllaceae  Larrea tridentata @ BBSL (1)
_  Withheld @ BBSL (9); BBSL__ZION (3)

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Updated: 2024-03-29 15:35:47 gmt
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