316 THE CANADIAN ENTOMOLOGIST. 



somewhat polished, thinly grayish pollinose ; only marginal ma- 

 crochsetae on second and third abdominal segments, none at all on 

 first segment. Cheeks not over one-fourth the height of the eye. 



Length, 9 mm . . . G. facialis Coq.* 



Third aristal segment not less than twice the length of second segment ; 

 parafacials with a row of macrochaetie or strong bristly hairs, and 

 between these and the eye rows of weaker hairs, these extending 

 from the cheeks up to the lowest frontals. Ocellar bristles present 

 or absent. First abdominal segment bearing marginal, remaining 

 segments bearing marginal and sometimes discal macrochaeta?. . .3. 



3. Abdomen and mesonotum grayish pruinose or pollinose ; the mesono- 



tum with darker vitt?e, the abdomen with dark-reflecting spots. . . . 4- 

 Abdomen, as viewed from above, dark brown, somewhat polished, with, 

 out grayish pruinosity or pollinosity ; mesonotum, as seen from above, 

 thinly grayish-dusted, with darker vittas only on the anterior part, 

 the remainder of the mesonotum and the scutelium appearing some- 

 what polished, the scutelium dark reddish ; first two abdominal 

 segments on the sides reddish, the first three segments with strong 

 marginal macrochaet?e, the second and third with short erect bristles, 

 intermingled with which are sometimes discal macrochsetpe ; ocellar 

 bristles present or absent ; species having a superficial resemblance 

 to BlepJiaripeza leucoplu-ys Weid. Length, 1 1 mm. G. cockereliiCoc^. 



4. Second and third abdominal segments with discal macrochaetse 5. 



Second and third abdominal segments without discal macrochietre ... 6. 



5. Ocellar bristles not developed ; sides of front more or less strongly 



tinged with reddish, in certain lights appearing somewhat polished, 

 thinly pruinose; scutelium red, polished, thinly grayish-dusted; 

 abdomen in the male with the sides broadly reddish, the fourth 

 segment black or reddish tinged, somewhat polished, only thinly 

 grayish-dusted, second and third segments with strong discals in 



both sexes. Length, 12 mm G. setosa Coq. 



Ocellar bristles developed, strong, proclinate ; sides of the front opaque, 

 densely yellowish-pollinose ; scutelium bhckish at base, only slightly 



*In the single specimen of this species (the type, male) in the U. S. N. M. 

 collection, only ihe larg-e scars of the ocellar bristles remain. That the specimen 

 once possessed well-developed ocellar bristles there can be no question ; in the 

 description of the species, however, nothing- is said in regard to the direction of 

 the bristles, so that it is not certain that they were present when the specimen 

 was received by Mr. Coquillett. In view of this fact and the singular divergence 

 from the typical generic character presented by this species in the almost bare 

 parafacials, its generic position must remain to a certain extent in doubt until 

 perfect specimens are secured. 



