172 Ihiitr (I lid h'iiah — Sonic Aineriraii iMosqultoes. 



Mochlostyrax jamaicensis Grabham. 



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

 in the table witli ])ilosns Dyar & Knab, ditfering in the relative length of 

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

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

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

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

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

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

 with his description. They are apparently identical with ouv ^f. foridanus. 

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

 may be found to possess diflerences, when known, as in the case of Cule.v 

 caniiDdiiae and C. vidIIIs, referred to above, where the larvae are alike and 

 the adults diti'er, but inhabit separated localities. As it stands, M.Jhridu- 

 nua 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 consi)icuous errors in description as these would have to be con- 

 sidered. 



