Dec, 1906] Dyar and Knab: Larvae of Cuucid^e. 179 



We are unable to distinguish the larvae of portoricensis and rutila, 

 which occur together, and conclude that there is but one species, the 

 degree of white banding on the tarsi of the adults being probably 

 variable. The larvae inhabit hollow trees and similar artificial 

 situations. They are exclusively carnivorous in their diet, devour- 

 ing the larvae of the other Culicinae with which they live. Mr. Busck 

 has noted that they kill all the larvae that are with them before pupa- 

 tion. We have the species from the southern Atlantic States, 

 West Indies and Central America. A specimen from Guadeloupe 

 (Busck) was named "M. violaceus," but the adult was in poor con- 

 dition. 



Megarhinus violaceus Wiedemann. 



Culex violaceus Wiedemann, Dipt, exot., i, 7, 1821. 



We accept this determination with some hesitation for some very 

 pale colored larvae of normal structure taken from the leaves of 

 Bromelias by Mr. Urich in Trinidad. The species was described from 

 Bahia( Brazil), but is insufficiently known, as stated by Blanchard. 

 We would note that Dr. Butz has recently described two Megarhinus 

 bred from Bromelia water, one in Bahia, the other in Rio Janeiro. 

 We are surprised that there should be several species with this limit- 

 ed habitat, and suspect the possibility of variability in the adults, 

 as in the foregoing species. 



Genus PSOROPHORA Desvoidy. 



Psorophora Desvoidy, Mem. soc. d'hist. nat. Paris, iii, 412, 1827. 

 Psorophora Blanchard, Les Moustiques, 237, 1905. 



Table of species. 



1. Air tube less than three times as long as wide; a single tuft almost at tip 



cilipes 



Air tube four times as long as wide; a single hair shortly beyond the 



peeten 2 



2. Labial plate with the teeth regular and subequal ciliata 



Labial plate with the next to basal tooth greatly enlarged howardii 



Psorophora cilipes Fabricius. 



Culex cilipes Fabricius, Syst. Antliat., 34, 1805. 

 Culex cilipes Blanchard, Les Moustiques, 373, 1905. 



We have accepted this identification for some very distinct larvae 

 taken by the junior author in Puntarenas, Costa Rica. Blanchard 



