Smithsonian Institution, Entomology Department · 9
Stelis permaculata, face |
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Overview |
Stelis (Stelidium) trypetina (Robertson)
Stelidium trypetinum Robertson, 1902. Canad. Ent. 34, p. 232. ♀.
Stelis (Stelidium) ontariana Sladen, 1916. Canad. Ent. 48, p. 312. ♀♂.
Stelis (Stelidium) trypetina Cockerell, 1922. Canad. Ent. 54, p. 143.
Stelidium trypetinum Robertson, 1929. Flowers and Insects, Lancaster, Pa., Science Press. (flower records)
FEMALE—Length 5 mm.; black, with very small, cream-colored macu1ations on head and abdomen; a pair of narrow, slightly separated maculations along inner orbits and a narrow, transverse maculation back of each eye, near margin of vertex; face considerably longer than distance between eyes above; eyes slightly convergent below; lateral ocelli slightly nearer margin of vertex than to each other, and slightly nearer each other than to eyes; clypeus nearly flat, apical margin nearly straight; mandibles 3-dentate, middle tooth slightly nearer inner angle than to apical tooth; labrum with a median, basal, triangular, polished and impunctate area, densely and finely punctate on each side and apically; cheeks subequal to eyes in width; transverse carina of prothoracic tubercles very low, barely evident; tegulae shining, uniformly, closely and deeply punctate; wings faintly smoky, veins piceous, recurrent veins received well within base and apex of 2nd submarginal cell; front tibiae without distinct, apical spines, mid tibiae with a pair of very short, acute spines, and hind tibiae with single, triangular, spine-like, apical projection; spurs yellowish, mid tibial spur very short; pubescence entirely pale, very short and thin, rather dense but not hiding surface around antennae and over lower half of face, somewhat more copious on pleura, thin on abdominal terga, but forming rather definite, apical fasciae toward sides on terga 1-4; punctures coarse, deep and distinct in large part, close and coarse over most of face and cheeks, but becoming finer and more dense on clypeus and sides of face; punctures coarse and close over most of thorax, posterior face of propodeum polished, shining and impunctate, with a narrow, pitted area across dorsal margin; discs of abdominal terga quite coarsely and deeply punctate, punctures slightly separated medially, becoming densely crowded toward sides, apical margins narrowly depressed, shining, impunctate and yellowish-hyaline; terga 3-6 gradually narrowed, resulting in a conicle form of the abdomen, tergum 6 triangular posteriorly, coarsely and deeply punctate, much exceeded by the elongate and broadly rounded 6th sternum; sterna 1-5 coarsely and closely punctate, with quite dense, apical fringes of elongate white hairs, 6 very minutely and closely punctate except around the dull testaceous, more nearly impunctate margin.
DISTRIBUTION—Illinois to Virginia, August and September.
FLOWER RECORD — Pyenanthemum. Recorded by Robertson (1929) on Aster. Erigeron, Rudbeckia and Solidago.
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Updated: 2024-04-26 02:30:37 gmt
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