596 CALIFORNIA ACADEMY OF SCIENCES. 



ereous on the second segment. No dark spot on venter. 

 Facial, frontal and ocellar callosities perfect. 



8. Apatolestes comastes Will. El Paraiso, Baja 

 California (Haines). May. Five females. Rancho 

 Viejo, B. C, April, one ? . I refer these somewhat 

 doubtfully to this species. Their length is 10 mm. 

 They agree quite well with Williston's description. The 

 tibiae are rather brownish which may be due to bad pre- 

 servation, and the cross-veins are hardly clouded. 



9. Apatolestes (or nov. gen.) eiseni n. sp. 



San Jose del Cabo (Eisen). One S • Length, 7^ 

 mm. Wholly blackish. Thorax with a slight whitish 

 bloom. Scutellum and abdomen shining blackish brown. 

 Legs black. Wings quite evenly and very decidedly 

 smoky, a little lighter in the neighborhood of anal angle. 

 Eyes contiguous for a long distance, flattened anteriorly, 

 face short. Antennae rather slender, not long, brownish, 

 first joint short, second still shorter; third not like Apa- 

 tolestes, but composed of only five annuli, the basal one 

 swollen and rather bead-like, as thick as first and second 

 antennal joints, while the remaining annuli are slender. 

 Proboscis and palpi blackish. Hind tibia? with spurs. 

 Ocelli present. 



This can hardly be the $ of Apatolestes comastes Will. , 

 and I believe will prove to be a new genus. It is entirely 

 different from Chrysops in its antennal structure, and can 

 hardly be either a Silvius or an Apatolestes, I hesitate 

 to describe the genus, however, from the male alone. In 

 antennal characters it seems to approach the genus Go- 

 niops Aldrich. 



10. Chrysops pachycera Will. El Taste, Baja Cal- 

 ifornia (Eisen). September. One ? and two males. 

 These agree with Williston's description in the color of 



