172 /)?/? ondKnab Some American Mosquitoes. 



Mochlostyrax jamaicensis Grabham. 



According to the characters given by Dr. Grabham, this species will fall 

 in the table with pilosus Dyar & Knab, differing in the relative length of 

 the tube. In jamaicensis the tube is "about five times as long as broad (at 

 base) " while in pilosus it is four times as long as broad. There are fewer 

 comb scales in jamaicensis and they are larger; the anal gills are unequal. 

 Dr. Grabham has kindly sent us some larvae labelled " Mochlostyrax jamaic 

 ensis" which differ from his diagnosis in having the body glabrous and the 

 air tube three and a half times as long as wide ; otherwise they agree well 

 with his description. They are apparently identical with our M. floridanus. 

 Still this may be a case of geographically isolated forms, and the adults 

 may be found to possess differences, when known, as in the case of Culex 

 carmodyae and C. mollis, referred to above, where the larvae are alike and 

 the adults differ, but inhabit separated localities. As it stands, M.florida- 

 nus will have to be added to the Jamaican list, it being more probable that 

 Dr. Grabham had two species before him than that he should have made 

 any such conspicuous errors in description as these would have to be con 

 sidered. 



