184 Journal New York Entomological Society, [vol. xiv. 



Genus T/ENIORHYNCHUS Arribalzaga. 



Tceniorhynchus Arribalzaga, Rev. del Mus. de La Plata, ii, 147, 1891. 

 Coquillcttidia Dyar, Proe. ent. soc. Wash., vii, 47, 1905. 

 Tceniorhynchus Blanehard, Les Moustiques, 3S1, 1905 



Taeniorhynchus perturbans Walker. 



Culex perturbans Walker, Ins. Saund., i, 42s, 1856. 



Culex perturbans Dyar & Currie, Proc. ent. soe. Wash., vi, 218, 1904. 



Tceniorhynchus perturbans Blanehard, Les Moustiques, 386, 1905. 



The mature larva is undiscovered and its habits remain a mystery. 

 Several excellent collectors searched for it in vain. Professor J. B. 

 Smith had masses of Spirogyra examined, but without result, as he 

 tells us. The young larva obtained from eggs has been described, 

 but failed to feed. The peculiarities of habit, whatever they may 

 be, which have rendered this species undiscoverable are evidently 

 common to the other members of the genus, for Professor Goeldi in 

 Brazil (Os Mosq. no Para, 107, 1905) has exactly repeated our ex- 

 perience with T. fasciolatus Arrib. and T. arribalzagoe Theob., and 

 his first stage larva agree structurally with ours. The antennae are 

 excessively long and the air tube is roundedly narrowed at the middle, 

 the distal half being slender and resembles a triick spine. The tip 

 is armed with hooks. 



Genus MANSONIA Blanehard. 



Panoplitcs Theobald (not Gould), Journ. Trop. Med., iv, 229, 1901. 

 Mansonia Blanehard, Cont. rend. heb. Soc. Biol., liii, 1045, 1901. 

 Pneumaculex Dyar, Proc. ent. soc. Wash., vii, 46, 1905. 

 Tceniorhynchus Dyar (not Arribalzaga), Proc. ent. soc. Wash., vii, 47, 1905. 



We are unaquainted with the larva of the typical species of Man- 

 sonia (titillans Walk.) and if it should prove to be different in struc- 

 ture,* the name Pneumaculex is available for the forms here associ- 

 ated. The senior author has shown that the genus should be called 

 Tceniorhynchus if the rule of first species be accepted in determining 



the type. 



Table of species. 



1. Plate- on the sixth abdominal segment a dorsal saddle; no plate on the 

 eighth segment below the comb signifer 



*We are almost certain that this will prove to be the case. Goeldi figures 

 the eggs of titillans (Os Mosq. no Para. 114, 1905), which have nothing in com- 

 mon with those of the species here treated, but are of the type of an Aides, 



