188".] ON A NEW PARASITIC DIPTEROUS INSECT. 163 



Anteus 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 spermathecaj in the 7th segment. Both genera have two 

 pairs of vesiculpG 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 genns. 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. Whatever may be the way in which the 

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

 Thamnodrilus are perfectly normal. Anteus, like Thamnodrilus, is 

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



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

 Hippoboscidse. By Charles O. Waterhouse. 



[Eeceived 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 Mr. 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 tlie almost total absence of wings — a character which 



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



11* 



