38 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. G?.. 



Abdomen with the third and fourth tergites shining brown or black on the 

 venter, contrasting with the pollinose second; inner forceps more slender 

 apically, almost straight, with a minute tooth in front at apex, hairy only 

 about two-thirds of their length; femora black viriiis, new subspecies. 



ZENILLIA BLANDA BLANDA Osten Sacken. 



Front variable in both sexes, in male from 0.19 to 0.27, and in the 

 female 0.245 to 0.32 of the head width; front, face, and posterior 

 orbit silvery white pollinose; sides of front sparsely clothed with 

 indistinct short hairs; the frontal bristles reach well down nearly 

 opposite the base of third antennal joint, the two uppermost ones 

 stout and reclinate ; facial ridges bristly on the lowest fourth, bucca 

 linear, about one-tenth the eye height ; palpi nearly always yellow, 

 sometimes slightly reddish, clothed thickly with short black hairs; 

 probosis yellow; antennae yelloAvish, as long as the face, the third 

 joint in both sexes from three and one-half to four and one-half 

 limes the second; arista gradually tapering from base to apex, pe- 

 nultimate joint short. Thorax black, gray pollinose, marked with 

 four black vittae, the outer ones broken at the suture ; dorsocentral 

 macrochaetae variable, in the type specimen there are four, but in 

 many specimens which are certainly this species there are but three, 

 occasionally a specimen will be found with four on one side and 

 three on the other; scutellum grayish, bearing two long and two short 

 pairs of marginal bi'istles, the apical pair curving upward or back- 

 ward; there is also a weak pair on disk. Sternopleura gray polli- 

 nose, clothed with fine black hairs and bearing two stout and un- 

 usually a vestigial third bristle, quite often there are but two and 

 sometimes three quite well developed ones on one side and but two on 

 the other. Abdomen thick, the fourth segment shorter than the 

 third, blunt, closing in a slit behind in the female in the lower end of 

 which the genital organs are placed ; black, the first segment wholly 

 so, the second and third gray pollinose at base their apices blackish, 

 fourth segment slightly yellowish, sometimes grayish pollinose. 

 First segment with marginal macrochaetae, second with marginal 

 and a median pair of discals ; third with one pair of median discals 

 and a marginal row, the fourth with two rows, one on the apical 

 half and the other at the extreme apex; abdominal hairs depressed. 

 Legs yellow, femora often black, tarsi blackish, mid tibiae with one 

 bristle on the outer front side near the middle; hind tibiae weakly 

 ciliate, with one longer bristle near the middle. Wings hyaline, the 

 third vein with two bristles at its base. 



Length 4 to 8 mm. 



Redescribed from many specimens of both sexes, including several 

 long series that were reared. The type of Uanda. locality not given, 

 is in the Museum of Comparative Zoology. Cambridge, Massachusetts, 



