1916.] NATURAL SCIENCES OF PHILADELPHIA. 499 
hyaline, the stigma inchstinct, brownish; veins dark ])r()wn, sub- 
costa more yellowish. Venation (Plate XXV, fig. 14) Rs moderate 
in length, about one and one-half the length of the deflection of 
Ri+&; cell 1st M2 small to elongate; basal deflection of Cui variable 
in position, before, at or beyond the fork of M. 
Abdominal tergites dark brown, the hypopygium bright 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, d', Orono, Penobscot County, Maine, June 12, 1913 
(Alexander) . 
Paratopotypes, 4 d^'s; paratype, d", Hyattsville, Maryland, 
September 1, 1912 (Malloch); d" , 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 M2, etc. 
ATARBA Osten Sackcn. 
Alarba Osten Sacken; Monographs of the Diptera of North America, pt. 4, 
p. 127 (18G9). 
Atarba cincticornis sp. n. (Extra-limital.) 
Atarba raricornis Alexander (in part); Transactions of the American Ento-' 
mological Society, vol. 40, p. 232 (1914). 
Antennffi 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^ of the wings 
very small. 
3i"a^e.— Length, 4.2 mm.; wing, 5 mm. 
Rostrum and palpi reddish. Antennse with the basal segment 
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. 
