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Nomada truttarum Cockerell, 1909
Nomada (Xanthidium) truttarum Cockerell, 1909; Nomada (Heminomada) truttarum Cockerell, 1909

Life   Insecta   Hymenoptera   Apoidea   Apidae   Nomada
Subgenus: None


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Identification
Extracted from: Cockerell (1909). New American Bees. The Entomologist vol. VIII


Length about 8 mm., the abdomen fusiform and rather slender; belongs to the subgenus .Xanthidimn. Head broad, orbits not greatly diverging above; face with appressed silvery hair, not concealing the surface; mandibles simple; mandibles except apex, labrum, clypeus (a black sutural spot on each side), quadrate supraclypeal patch, and large lateral face-marks (filling in the whole area between clypeus and eyes, and extending from upper corners of clypeus, touching the antennal sockets, to a point some distance above antennrn) all pale yellow; a narrow yellow stripe, becoming reddish, extends up posterior orbital margins, and there is a ferruginous patch above summit of eye; third antenna} joint scarcely over half length of fourth; scape moderately swollen, yellow in front, black behind, the junction of the colours reddish; flagellum stout and long, red, with the first five joints strongly blackened above, and the third to fifth strongly undulate; apical joint obtuse; thorax black, with the hair all white, especially conspicuous on pleura; scutellum, four rather obscure stripes on mesothorax, part of prothorax above, and a large spot on anterior part of pleura, all ferruginous; tubercles pale yellow suffused with red; mesothorax entirely black; tegulrn shining hyaline testaceous, with two pale yellow spots; wings dusky at apex, otherwise nearly clear; stigma dark ferruginous; b. n. going a long distance basad of t. m. ; second s. m. large, broad above, receiving the r. n. at the beginning of its last third; third t. c. abruptly bent; legs red, without yellow, except that the anterior femora are suffusedly yellowish in front; a little black at base of anterior femora, more on middle femora, and hind femora broadly black beneath except at apex; abdomen rather well punctured; first segment black basally, and with the broad band red without any yellow; second segment red, with an exceedingly broad lemon-yellow band, narrowly interrupted in the middle (by a longitudinal red band) and notched at each upper lateral corner; segments three to six reel with yellow bands, on three and four widely interrupted, on six a median patch, not reaching the sides of the segment; apical plate broad, strongly notched; venter red, suffused with blackish, and with a large diamond-shaped yellow spot at extreme apex. In the tables of Rocky Mountain Nomada runs to N. vicinalis, Cresson, from which it differs by the large lateral face-marks, first abdominal segment without yellow, &c.

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Updated: 2024-03-29 05:36:55 gmt
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