AMERICAN DIPTERA. 313 



Holopogoii giittiila. 



Dasypogon guttida Wiedemann, Dipt. Exot., 228, 1821. 



Dasypogon guttula Wiedemann, Auss. Zwei., I, 411, 1828. 



Dasypogon guttula ? Walker, List, II, 355, 1849. 



Holopogon philadelphicus Schiner, Verb. Zool.-Bot. Ges., XVII, 

 360, 1867. 



Holopogon philadelphicus Loew, Berl. Ent. Zeit., XVIII, 367, 

 note, 1874. 



Holopogon guttula Johnson, Psyche, 76, 1905. 

 $. — Length 6-7 '}nm. — Black; the abdomen polished blue-black; the 

 pleurse and a large angular spot above and behind and including each 

 humeral angle grayish- white; the rest of the dorsum thinly clothed with 

 a dark olivaceus bloom. 



Face and front yellowish-brown pruinose; the occiput more grayish; 

 pile of face, except on the extreme oral margin, and the beard white; 

 that of the wholly black antennas, front, tubercle and upper occiput 

 black. Thorax, when viewed from before, shows on each side two 

 grayish-white pruinose spots including the humerus and extending 

 above and inward to the obscure median geminate stripe, and back- 

 ward nearly to base of wings; rest of dorsum clothed with a thin 

 brownish-black, in some lights olive-black, bloom; pleurae and coxae 

 grayish-white pruinose. Dorsum of thorax and scutellum with black, 

 not very prominent, black pile; the white pruinose spots, posterior 

 callosities and the pleura with white pile. Trichostical pile long and 

 white. Abdomen highly polished, with bluish reflections, the micro- 

 scopic pile of the tergum and the longer pile of the sides and venter 

 wholly white. Legs wholly black, the long pile white, the weak bristly 

 hair black; the front tibise and their metatarsi clothed on the inner 

 side with a dense golden pubescence. Wings hyaline, beautifully 

 violescent; veins black; venation normal. 



Habitat. — North Sangus, Mass. (July 6) ; Penn. ; N. J. ; N. C. ; 

 Savannah, Ga. ; Ormond, Fla. (Mrs. Slosson, Apr.). Prof. C. 

 W. Johnson in Smith's Hst reports this species from the fol- 

 lowing places in New Jersey: Clementon (May 30), Newark 

 (June 14), Jamesburg (July 4), Dunnfield (July 9). In the 

 National Museum, Mr. D. W. Coquillett has identified spec- 

 imens from Ariz., Col. and Mont. 



The above description was made from a fresh perfect spec- 

 imen taken by the writer at North Saugus, Mass. In the 

 collections of the Massachusetts Agricultural College and the 

 Am. Ent. Soc. of Phila. are several partially greased specimens 

 of both sexes; they agree for the most part with the above 

 description, but there seems to be in some individuals a ten- 



TRANS. AM. ENT. SOC, XXXV. (40) AUGUST, 1909 



