Technical Series Volume 23-27 (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. 1915 Excerpt: ...brown or black stripes, the central one straight, the lateral ones curved, and dilated slightly anteriorly, the dilated portion with white pollinose spot when viewed from behind; pleura? gray, opaque; scutellum and postscutum concolorous. Abdomen gray, segments 2-i broadly opaque brown or black-brown on dorsum, the one below basal scale only slightly darker on center. Legs dark gray, only the bases of tibiae and bases of first tarsal joints of mid and hind legs paler, except in immature specimens, when the legs may be yellowish, but they never show so distinctly bicolored as in virgatum or hunteri. Wings grayish, the veins rather more distinct than usual. Halteres yellow, darker at base of stalk. Frons slightly raised in center, divergent-sided, as long as broad at upper angle of eyes, where it is one-fourth wider than at lower angle of eyes; surface hairs white, with a slight admixture of black ones, most numerous on lateral margins; face as broad as frons at center, slightly longer than broad, the surface hairs yellowish white: palpi black haired; postocular cilia white and black intermixed, the black hairs strongest. Scutum with yellowish white, regular, hairlike pilosity, anterior angles with short intermixed black hairs, posterior fourth with distinct, long, black, upright hairs; pleural tuft whitish; post-spiracular area haired; scutellum with whitish pilosity and upright black hairs. Abdominal basal scale opaque black, fringe pale, whitish; surface hairs on abdomen short, pale yellow or whitish. Legs with whitish pilosity and some upright black hairs, which are most noticeable on dorsal surfaces and tarsal joints, the paired apical fore tarsal hairs not so conspicuous as in venmtum and its allies; tarsal claws simple (PI. II, fig. 10). Length, 3-4 mm...