THE CANADIAN ENTOMOLOGIST. 175 



A NEW ASILID GENUS RELATED TO ERAX. 



BY D. W. COQUILLETT, LOS ANGELES, CAL. 



Among the species heretofore referred to the genus Erax is a small 

 group in which the first submarginal cell is divided by an oblique cross 

 vein into two cells. The venation is similar to that of the genus 

 Promachus, except that the foremost of the two apical submarginal cells 

 is shorter, and the third vein curves forward to the costa before the apex 

 of the wing, instead of curving backward to the hind margin beyond the 

 apex. The examination of quite a large series of specimens belonging to 

 this group proves that the characters above mentioned are constant, and 

 as the genus Erax already contains a large number of species, it is 

 desirable to separate as a new genus those species possessing these 

 characters. For this group I propose the name Effcria, and would 

 further characterize the genus as follows : — 



Efferia, n. gen. — Third joint of antennae provided with a distinct 

 naked, terminal style ; wings having three submarginal and five posterior 

 cells, the marginal, fourth posterior and anal cells closed ; third vein 

 terminating in the costa before the tip of the wing ; front tibiae destitute 

 of a claw at the apex ; ovipositor of the female compressed and destitute 

 of a circlet of spines at the tip. 



Two species belonging to this group have been described from North 

 America: anoma/is, Bellardi (Saggio, II., 32) and computus, Macquart 

 (Dipt. Exot., I , 2, 117). The last-named species has not been identified. 

 My collection contains three apparently undescribed species, which, with 

 anoma/is, may be separated as follows : — 



i. — Thorax destitute of a median longitudinal crest of nearly erect 



hairs 2 



Thorax provided with such a crest ; bristles of the palpi 



black rava, n. sp . 



2. — Bristles of palpi, mystax and scutellum white 3 



Bristles of palpi, scutellum, occiput above, and several in lower 



part of mystax, black anomalis, Bell. 



3- — Abdomen silvery-white pollinose, and with rather long white pile- 

 parted in the middle and directed outward Candida, n. sp. 



Abdomen grayish-brown pollinose, and not with pile as above 

 described pernicis, n. sp. 



Efferia pernicis, n. sp., & . Black, the base of the tibire red. Pile and 

 bristles of entire head yellowish-white, the pollen yellow. First antennal 



