Dec, 1906] DyarandKnab: Larvae of Culicid^. 203 



and Port Limon, Costa Rica, in water in cocoanut shells and cacao 

 husks. 



Aedes knabi Coquillett. Fig. 19. 

 Culcx knabi Coquillett, Proc. ent. soc. Wash., vii, 183, 1906. 



Collected by the junior author at Tehuantepec, Mexico, in a hollow 

 in a mango tree and at Salina Cruz, Mexico, also in a tree hole. 



Aedes insolita Coquillett. Fig. 20. 

 Verrallina insolita Coquillett, Can. ent. xxxviii, 62, 1906. 



Collected by the junior author at Tehuantepec, Salina Cruz, Al- 

 moloya, Mexico; Sonsonate, Salvador, and Puntarenas, Costa Rica. 

 The larvae were all in holes in trees except in one instance, at Tehuan- 

 tepec, they were in a (cemented) tank in a shaded part of the garden 

 at the public bath house. 



Genus CULISETA Felt. 



Theobildia Neveu-Lemiire (not Theobaldius Nevill), C. R. heb. soc. Biol., liv, 



1329, 1902. 

 Culiseta Felt, Bull. 79, N. Y. Sta. Mus., 391 c, 1904. 

 Theobaldinella Blanehard, Les Moustiques, 390, 1905. 



The larvae of this genus are extremely similar ; the following small 

 differences appear to hold for the species. The European annulatus 

 Schrank is recorded from the West coast of America, but we have 

 seen no larvae. Meinert's excellent figure as well as Theobald's (Mon. 

 Culic, hi, 150, 1903) show it to be a Culiseta, but neither is detailed 

 enough to let us place the larva in the table. Grabhamia vittata The- 

 obald (Can. ent. xxxv, 313, 1903) probably belongs here likewise. 

 (See remarks under Aedes abfitcJiii). 



Table 0} species. 



1. Lower head tuft with three long hairs, upper multiple 2 



Both head tufts multiple, alike absobrinus 



2. Basal pecten teeth of the air tube furcate incidens 



Basal pecten teeth of the air tube with many branches consobrinus 



Culiseta incidens Thomson. 



Culex incidens Thomson, Kongl. Sven. Freg. Eugenies Resa omk. jood., Dipt., 



443, 1868. 

 Culex incidens Dyar, Proc. ent. soc. Wash., vi, 38, 1904. 

 Culex nigripes Blanehard (not Zetterstedtj, Les Moustiques, 345, 1905. 

 Theobaldinella incidens Blanehard, Les Moustiques, 393, 1905. 



