Transactions of the American Entomological Society Volume 39 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 Excerpt: ...very dark cinereous pile. Third antennal segment distinctly shorter than fourth, the fifth much longer than the fourth. Thorax.--Clothed with entirely dark brown pile; a large area on dorsal disc and all but hind and side margins of scutellum naked, the pile apparently having been rubbed off. Abdomen.--Entirely dark. Genitalia (figs. 159 and 166).--Much like those of medius (see the comparison of the genitalia of these two species, following the description of medius'). Sagittae with nearly straight shafts and with outer margins of heads nearly entire, scarcely serrate at all; their heads extending posteriorly but little beyond the long inner lobes of the squamae, these lobes reaching mesad far past the rounded projections on the inner sides of the volsellae to nearly even with the outer margins of the heads of the sagittae. Tips of volsellae reaching considerably beyond tips of squamae. Wings.--Dark and with distinct violaceous reflections. Legs.--Coxae and trochanters with scattering dirty whitish pile, though mostly dark. Femora and tibiae black. Hind tibiae with outer faces convex and hairy throughout; with no long fringes and no trace of corbiculae. Hind metatarsi with outer faces distinctly concaved; with no long fringes. Dimensions.--Length, about 19 mm.; spread of wings, about 38 mm. This species is most closely related to medius, but appears to be distinct from it. B. atratus is certainly quite distinct from both and is possibly the male of niger. Incarum is also quite distinct from all these forms. Mexicanus is certainly distinct from pullatus. The volsellae of the genitalia of pullatus have much wider apices and more hook-like apical projections than do those of mexicanus, and the squamae of pullatus have the outer lobe well developed and promine...