AMERICAN DIPTERA. 301 



Type, — Collection of Prof. C. W. Johnson, Curator of the 

 Boston Society of Natural History. There are two metatypes 

 in the collection of the Massachusetts Agricultural College. 



Habitat. — Chicopee, Mass. (May 18-24, F. Knab) ; Ocean 

 County Q. B. Smith), Clementon (May 9, 30), Wenonah (May 

 14) and Riverton (May 29), N. J. 



Prof. C. W. Johnson, who is responsible for the last three 

 references, states that this is quite a common species during 

 the spring on the low damp ground of southern New Jersey, 

 where he has taken it in good numbers. 



Lasiopogon tetragranimus. 



Lasiopogon tetragrammus Loew, Berl. Ent. Zeitsch., XVIII, 368, 

 370, 1874. 



9. — Length about 9 mm. — Translation. Black; the usual thoracic 

 stripes fuscous, the intermediate one narrowly bisected, the lateral 

 ones much abbreviated anteriorly, and the lateral ones of the same 

 color; the space between the lateral and intermediate stripes and the 

 last seginent of the abdomen polished black, the latter white pilose 

 the rest of the body black pilose; the several segments of the abdomen 

 grayish pruinose on the posterior margin. Length of body 4-7-12 lin., 

 of wing 4 lin. 



Not greatly unlike L. bellardi Jaen., but the bloom of the head and 

 thorax, with the exception of the more yellow of the face, yellowish- 

 brown or almost deep brownish. The bisected middle thoracic stripe 

 blackish-brown, sharply defined, the lateral stripes greatly abbreviated 

 anteriorly, of the same color, but less sharply defined; between the 

 middle and lateral stripes on each side is insected a blackish-brown 

 stripe, the fore part of which is bent outward and extends as far as the 

 grayish pruinose humeri. Abdomen black, only moderately polished; 

 the first segment everywhere, and the six following ones only on the 

 sides and hind border, grayish pruinose; the last segment wholly 

 without bloom and highly polished. Halteres yellowish. Wings gray- 

 ish, the venation normal, veins brownish-black; the small cross- vein 

 lies considerably before the middle of the discal cell. The arrange- 

 ment of the hair and bristles is as usual in this genus. Mystax, hair 

 on the first two antennal segments, the front and upper part of the 

 occiput black ; the hair on the larger lower part of the occiput and 

 on the under side of the proboscis white ; that on the lateral oral mar- 

 gins yellowish-white. The prothorax only on the sides with more 

 whitish, above with more black hair; dorsum of mesothorax and scutel- 

 lum with black pile and bristles; the scant pile on the pleurae whitish 

 in front of the mesopleural suture, the fine hairs and the trichostical 

 hair black. The first abdominal seginent whitish pilose, on the pos- 



TRANS. .^M. ENT. SOC, XXXV. AUGUST, 1909 



