1887.] 



ON A NEW PARASITIC DIPTEROUS INSECT. 



163 



Aniens agrees with Thamnodrilus in the absence of dorsal pores, 

 in the arrangement of the setae, the position of the nephridiopores, 

 the characters of their internal funnel, and in the presence of a single 

 pair of spermathecse in the 7th segment. Both genera have two 

 pairs of vesiculje seminales in segments 11 and 12. The main 

 external points of difference appear to be in the clitellum, which is 

 much more extensive in Anteus than in Thamnodrilus, and in the 

 modification of the clitellar setse in the latter genus. In Thamno- 

 drilus the anterior mesenteries are not specially thickened as 

 they are in Anteus and there is no modification of the nephridia in 

 the genital segments. Wiiatever may be the way in which the 

 genital products are carried off in Anteus, the genital ducts of 

 Thamnodrilus are perfectly normal. Anteus, like Tham7iodrilus, is 

 a native of the northern part of the Soutii-American continent. 



6. Note on a new Parasitic Dipterous Insect of tlie Family 

 Hippoboscidse. By Charles O. Waterhouse. 



[Eeoeived January 31 , 1887.] 



The insect here described was found by Dr. R. W. Shufeldt^ at 

 Fort Wingate, New Mexico, on a species of Swift (Cypselus melano- 

 leucus), and transmitted to jMr. Sclater for examination. It is closely 

 allied to Anapera pallida, a European Dipterous parasite found on 



Cypselus apus. It is, however, much larger, and is at once distin- 

 guished by the almost total absence of wings — a character which 



' See Dr. Shufeldt's paper on this Swift, 'Ibis,' 1887, p. 151. 



11* 



