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© Copyright source/photographer
· 7
Colletes robertsonii, f, face, Hooker Co., Nebraska |
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· 7
Colletes robertsonii, f, left, Hooker Co., Nebraska |
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© Copyright source/photographer
· 7
Colletes robertsonii, m, back, Hooker Co., Nebraska |
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· 7
Colletes robertsonii, m, face, Hooker Co., Nebraska |
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© Copyright source/photographer
· 7
Colletes robertsonii, m, right, Hooker Co., Nebraska |
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· 7
Colletes robertsonii, f, face, Hooker Co., Nebraska |
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· 7
Colletes robertsonii, male, back, Pennington Co., SD |
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Colletes robertsonii, male, face, Pennington Co., SD |
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© Copyright Laurence Packer 2014
· 7
Colletes robertsonii FEM mm .x ZS PMax |
© Copyright Laurence Packer 2014
· 7
Colletes robertsonii MALE mm .x ZS PMax |
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Mitchell, Bees of the Eastern United States, Vol. I, 1960 · 1
Colletes robertsonii, figure9a |
© Mitchell, 1960
· 1
Colletes robertsonii, genital armature |
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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 12 mm.; length of face nearly equal to distance between eyes above; eyes slightly convergent below; malar space linear; facial foveae deep and distinct, rather broad medially, terminating above about half way between eyes and ocelli; clypeus projecting about one-third below suborbital line, with rather fine but deep and close punctures, these somewhat more widely separated toward apical margin; punctures above antennae somewhat more coarse and more widely separated but still rather close, those on vertex rather irregular, becoming very fine and close on cheeks above, but more coarse and widely separated on the shining ventral surface; basal segment of flagellum slightly longer than broad and considerably longer than pedicel, the following segments somewhat shorter, with length and breadth subequal, piceous below, blackish above; pubescence of head and thorax rather thin, but rather copious around bases of antennae, on vertex posteriorly and around prothoracic tubercles, apparently mostly pale, without blackish admixture, more whitish below on thorax; lateral angles of pronotum produced to form rather distinct acute spines; metapleural protuberance very low, not carinate; front coxae without distinct spines; legs piceous basally, mid and hind tarsi becoming somewhat reddened apically, spurs pale ferruginous; tegulae piceous, with scattered, irregular, minute punctures; wings subhyaline, veins ferruginous to piceous, stigma brownish-ferruginous; 2nd submarginal cell somewhat longer than 3rd, slightly narrowed above; scutum sparsely punctate in center, punctures rather coarse but shallow, becoming more closely punctate laterally, and very finely and closely punctate over anterior 3rd; scutellum with coarse, shallow irregular punctures; pleura coarsely and quite closely punctate anteriorly and above, becoming more finely punctate posteriorly, the hypoepimeral area rather smooth below, finely and deeply punctate above: dorsal area of propodeum very narrow, rather finely striate, lateral surfaces finely roughened, posterior face dull; abdominal terga very coarsely and deeply punctate, punctures close but distinctly separated in large part, somewhat more widely so on the basal segment, apical margins deeply depressed and hyaline, with dense entire white fasciae on segments 1-3, that on the 4th reduced, and lacking on the 5th, discs of the terga with very fine, pale pile which is hardly visible.
MALE—Length 11-12 mm.; length of face nearly equal to distance between eyes above; eyes slightly convergent below; malar space linear; facial foveae deep and distinct; clypeus protruding but very slightly below suborbital line, closely and finely punctate, but surface largely obscured by dense white pubescence; face below ocelli coarsely, deeply and closely punctate, punctures becoming somewhat finer on vertex, but still quite deep and distinct, finer on cheeks above and below; lateral ocelli subequally distant from eyes and each other; basal segment of flagellum blackish, slightly longer than pedicel, but length about equal to breadth, following segments piceous, slightly longer than broad; pubescence of head and thorax entirely white, that on face dense, but thin on vertex and dorsum of thorax, dense around tubercles and lateral surfaces of propodeum; lateral angles of pronotum acute, almost spine-like; metapleural protuberance not carinate; legs piceous, spurs more testaceous, tarsi yellowish-brown; tegulae piceous, finely and rather closely punctate; wings subhyaline, veins and stigma brownish to piceous; scutum coarsely and deeply punctate, the punctures close except in center of disc, those on scutellum rather widely separated, those on pleura coarse, close, deep and quite uniform; dorsal area of propodeum rather irregularly and indefinitely striate, lateral faces rather finely and closely punctate, posterior surface with close and rather deep punctures; abdominal terga coarsely, deeply and quite closely punctate, punctures of basal segments somewhat more widely separated basally, apical margins deeply depressed, covered with dense, entire, white fasciae, the discs with barely evident whitish pile.
DISTRIBUTION—This is a midwestern species extending from Colorado and New Mexico east to Minnesota, Illinois, Missouri and Mississippi. It is in flight during June, July and August.
FLOWER RECORDS—Stephen records this on Amorpha canescens, Monarda punctata occidentalis, Petalostemon candidus and P. violaceus. Robertson (1929) records it also on Petalostemon purpureum.
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Updated: 2024-04-26 20:36:24 gmt
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