﻿1927] Curran, Dipicra uf the B(-Iqian Congo 39 



Legs orange, the tarsi brown; anterior tarsi beneath with short, apically curved, 

 fine sensory hairs on the whole length. 



Wings brown on more than the l)asal half, the apex hyaline; the l)rown extends 

 slightly obliciuely across from the apex of the first vein, just over the apex of the discal 

 cell and thence a little more obliciuely to the posterior border; in front it fills out the 

 whole of the sub-costal cell. 



Abdomen black in the middle, orange laterally, the black varying in width from 

 one-third the abdominal width to a width equal to that of the scutellum, but always 

 narrower on the middle portion. First segment wholly tawny pilose, densely so 

 laterally, the black portion otherwise with appressed, short, black pile, the orange 

 lateral portion with longer, sub-erect tawny pile. 



Described from two specimens from Stanleyville, taken on April 

 10 and 27, 1915. 



Petrorossia chapini, new species 



Length, 7 mm. 



Female. — Head lilack, the lower fourth of the front, the face and lower half of the 

 occiput, pale grayish pollinose. Front and upper half of occi]:)ut opaque black, the 

 front, however, shining black Ijelow the middle. Frontal pile l)lack, but there are 

 some yellow hairs across the shining portion, the pile on the head elsewhere reddish 

 yellow, conspicuous except on the opaque portion of the occiput where it is short and 

 sub-appressed, the long pile commencing level with the dividing line on the eyes. 

 Circle about each antennal base dull ochreous, the antennae brown (third segment 

 missing). The extremely narrow mouth-edge is yellow. 



Thorax sub-opaque black above, clothed with rather alnmdant golden-reddish 

 tomentum which is longer and more abundant laterally, and with scattered black 

 bristly hairs. Pleura gray pollinose and clothed with golden reddish pile. Scutellum 

 clothed with fairly long golden tomentum and some black In-istly hairs, the three pairs 

 of marginal bristles reddish. 



Middle legs missing, the others reddish yellow, the posterior tarsi brownish, the 

 anterior pair becoming brownish on the apical half, clothed below with normal, tiny 

 bristles and entireh^ lacking sensory hairs. 



Wings strongly cinereous with luteous tinge in front, especially on the basal half. 

 Squamae whitish, the haltères yellow. 



Abdomen orange-red, the first segment black beneath the scutellum and clothed 

 with dense, erect, long reddish pile laterally, the pile elsewhere on the abdomen 

 shorter, fine, appressed, more golden reddish on the dorsum with scattered, sub- 

 appressed black bristly hairs which become quite numerous on the apical segment; 

 pile on sides and venter a little longer than on the dorsum. 



Described from a single, almost perfect, female, Stanleyville, April 

 5, 1915. 



Differs from gratiosa by the color of wings, etc. 



