204 



THE CANADIAN ENTOMOLOGIST. 



venation as in Asilus in the restricted sense. Posterior margins of the 

 abdominal segments without bristles that differ in length from those on 

 other parts of the abdomen. Female genitalia plainly conical ; male 

 appendages plainly bent upward near the middle of the length. 



Nigrasiliis nitidifacies, n. sp. — Black, wings slightly fumose, face just 

 beneath the antennae shining black; female with conical oviduct. 



Length, 12 to 15 mm. 



Facial gibbosity rather 

 prominent, and clothed 

 with black bristles above 

 and white bristle? below ; 

 face just beneath the an- 

 tennae shining black, other- 

 wise clothed with gray 

 dust, which is most pro- 

 nounced along the entire 

 margins of the eyes ; beard 

 white; occipito - orbital 

 bristles all black. Ground 

 colour of the thorax black, 

 but thinly covered with 

 gray dust, four to six black 

 bristles on the margin of 

 the scutellum; wings slight- 

 ly fumose, almost hyaline 

 on basal parts. Femora 

 all black, with fine white 

 hair and black bristles ; 

 tibia3 and tarsi more or less dark red, approaching black in parts. Hind 

 tibiae each with three or four black bristles on the front side near the 

 middle. Abdomen black above, with gray hind borders to the segments. 

 A male specimen collected in the Hope Mountains of British 

 Columbia by R. S. Sherman, July 16, 1906, and a female, collected on 

 Vancouver Island, July 2, 1903, by R. V. Harvey. 



This insect has the general appearance of the species of some of the 

 other genera of the subfamily Asilinse, but if Loew's classification is to be 

 followed and his subgenera raised to the rank of genera, as is the tendency, 

 it must stand in a new genus, mainly on account of the black colour and 

 the very peculiar genitalia, of both sexes. 



Fig. 8. — Nigrasilus nitidifacies.— Side view of the tip of the 



male abdomen (upper diagram). Dorsal view of the 



tip of the female abdomen (lower diagram). 



