THE CANADIAN ENTOMOLOGIST. 75 



NEW GENERA AND SPECIES OF DIPTERA. 



HY D. \V. COQUILLETl, WASfllNGTON, D. C. 



CONDIDEA, new genus of Syrphid?e. 



Near Helopliilus, but the antennal arista is plumose, the eyes con- 

 tiguous in the male, etc. General aspect of a species of Didea. Head 

 in profile very similar to that of Sericomyia tnilitaris (Williston's Synopsis 

 N. Am. Syrphid?e, Plate VII, fig. 36), except that the face is somewhat 

 shorter ; antennae as in that figure except that the third joint is subquad- 

 rate, with rounded angles ; body almost bare, abdomen noticeably wider 

 than the thorax, subovate, greatly depressed ; legs unarmed, femora not 

 thickened ; venation of wings as in Helophilus conostomus (Williston, 1. c, 

 Plate VIII, fig. 3a), Type, Condidea lata, nev/ species. 



This interesting form is practically a Sericomyia with a pediform first 

 posterior cell ; it thus forms a connecting link between the tribes Sericom- 

 yini and Eristalini. 



Condidea lata, new species. — Black, the thorax tinged with bronze, 

 the face and cheeks except a stripe extending from each eye to the oral 

 margin, the lower edge of the front and of the occiput, a pair of spots on 

 abdominal segments two, three and four, also the venter except apically, 

 light yellow, apex of abdomen reddish ; wings hyaline, stigma yellowish 

 brown. The yellow spots on the abdomen do not touch the lateral mar- 

 gin ; the first pair is very large and nearly circular ; second pair less than 

 half as large, the outer posterior angle of each spot almost cut off by the 

 black ground colour ; the third pair is much the smallest, each spot reni- 

 form and placed obliquely. Length, 15 mm. 



North Saugus, Mass. A male specimen collected by Mr. F. H, 

 Mosher. Type No. 10 156, U. S. National Museum. 



A CIIyE TO M US, new genus of Helomyzidfe. 



Near Helomyza, as restricted by Loew, but with only two pairs of 

 dorsocentral bristles, propleural present, two pairs of fronto-orbitals, etc. 

 Eyes circular, cheeks nearly as wide as the eye-height, third joint of 

 antennae broader than long, arista dorsal, bare. Femora without bristles, 

 tibiae with apical and pre-apical bristles only. Venation as in Heloviyza, 

 spines of costa well-developed. Type : The following species : 



Achcetomus pilosus, new species. — Reddish brown, the scutellum and 



legs yellow, bases of abdominal segments three to five dark brown, hairs 



and bristles black. Hairs of cheeks covering their lower half, no bristles 



near vibrissae. Pleura almost wholly covered with hairs except the portion 



>Iarcb, 1907. 



