1916.] NATURAL SCIENCES OF PHILADELPHIA. 499 



hyaline, the stigma indistinct, brownish; veins dark brown, sub- 

 costa more yellowish. Venation (Plate XXV, fig. 14) Rs moderate 

 in length, about one and one-half the length of the deflection of 

 R i+b ; cell 1st M t small to elongate; basal deflection of Cu t variable 

 in position, before, at or beyond the fork of M. 



Abdominal tergites dark brown, the hypopygium brighl reddish 

 yellow; sternites two to five dull brownish yellow basally, the caudal 

 margins dark brown; segments six to seven dark brown; eight and 

 nine dull yellow. 



The Maryland paratype is strikingly smaller (the smallest measure- 

 ments given) than the typical Maine material and has the stigma more 

 distinct, but is undoubtedly the same species. 



Habitat. — Northeastern United States. 



Holotype, c\ Orono, Penobscot County, Maine, June 12, 1913 

 (Alexander) . 



Paratopotypes, 4 cf's; paratype, cf, Hyattsville, Maryland, 

 September 1, 1912 (Malloch); <?, Lake Forest, Illinois, July 8, 1906 

 (Needham) . 



Type in the collection of the author. 



This species differs conspicuously from the only other eastern 

 species of the genus, R. flavipes Macquart (Plate XXV, fig. 13), 

 in the elongate rostrum, the uniformly dark legs, the clear wings and 

 the abdominal coloration. It is much more closely related to R. 

 longirostris Meigen (western Palaearctic region) which has the antennal 

 flagellar segments more elongated with longer verticils, the thorax 

 differently patterned, the wings broader with a higher cell 1st M 2 , etc. 



ATARBA « Isten Sacken. 



Atarba Osten Sacken; Monographs of the Diptera of North America, pt. 4, 



p. 127 (1869). 



Atarba cincticornis *p. n. (Extra-limital.) 



Atarba varicornis Alexander (in part); Transactions of the American Ento- 

 mological Society, vol. 40. p. 232 (1914). 



Antennae of the male greatly elongated, the flagellar segments 

 bicolored, the basal half of each segment black, the apical half yellow. 

 the segments with long outstretched hairs; cell 1st M 2 of the wings 

 very small. 



Male. — Length, 4.2 mm.; wing, 5 mm. 



Rostrum and palpi reddish. Antennae with the basal segmenl 

 reddish; second segment dark brown; flagellar segments with the 

 basal half to three-fifths black, the remainder of each segment light 

 yellow; fourth segment largely blackish; flagellar segments with 



