1919.] NATURAL SCIENCES OF PHILADELPHIA. 179 



The legs are entirely black. The wing pattern is more extensively 

 developed, and the cross veins not noticeably subhyaHne. 



9 . Black; frons and face, first and second antennal joints (tliird 

 wanting), scutellum, second and third abdominal segments laterally, 

 bases of ventral segments, tawny to rufous. Knob of halteres pale. 

 Wings brown or grayish brown, hyaline as follows: apex of marginal 

 cell to base of second submarginal, apex of first submarginal, entire 

 second and third submarginal, apices of first to fourth posteriors, 

 and large median area in discal. Somewhat subhyaline areas on the 

 cross-veins. Opaque. Pile black on: frons, face, first and second 

 antennal joints, mesonotum, humeri, notopleura, mesopleura below, 

 pteropleura, lateral margins of second and following segments, apex 

 of abdomen, fourth and following ventrals, and all coxae. All bristles 

 black. Pile yellow on: collar, upper mesopleura, lateral margins 

 of mesopleura, scutellum laterally, propleura, sternopleura, and 

 lateral margin of first segment. Pile white on roots of wings, and 

 second and third abdominal segments. Tomen mostly yellow, but 

 black on: legs, broad apex of second abdominal, narrow apex of 

 third, all of fourth and fifth except basal angles, medianly on sixth 

 and seventh, and fourth and following ventrals. Narrow base of 

 second abdominal, yellow; broad base of, third especially laterally, 

 whitish; second and third ventrals white. Posterior orbits whitish. 



Structurally same as divisa (by comparison with my specimens 

 of that species) but more robust. Length, 20 mm. 



Tijpe. — 9 ; Florence, Aiizona, (C. F. Biedermann), [A. N. S. P. 

 No. 6201]. Paratype. — 1 9 ; topotypical. 



Anastoechus barbatus. 



1877. Osten Sacken, Bui. U. S. Geol. Surv., in, 252. 



The species of this genus are easily separated from those of Sys- 

 toechus by the thick, facial pile. Material before me consisting 

 of 11 cf, 14 9, from Long Island, N. Y,, North Carolina, Texas, 

 Colorado, and New Mexico, fall into two groups. One having the 

 knob of halteres pale yellow, the other with the knobs black or 

 brown. There seems to be no corelation of these characters with 

 the difference in locality. The only two from the eastern Atlantic 

 region have the knobs pale; others from Colorado and Texas have the 

 same. 



A male from Europe, determined as nitidulus Fab., has a dis- 

 tinct, dorsal median line of dense white tomen on the abdomen 

 which is not present in any of the other males before me from the 



