128 INSECUTOR INSCITI^ MENSTRUUS 



The larva falls with scrratus, but has less teeth in the lateral 

 comb of the eighth segment, namely about seven instead of the 

 ten or more in serratus. The anal gills are large and con- 

 spicuously tracheate. 



Types, No. 21911, U. S. Nat. Mus., three males and two 

 females, bred from larvae lying on their backs on the bottom 

 of temporary rainpools in sandy land, Surinam, March 12 to 

 20, 1918 (Mrs. J. Bonne- Wepster). 



Aedes (Ochlerotatus) nubilus Theobald. 



Culex mibilus Theobald, Mon. Culic, iii, 208, 1903. ( $ ) 

 Ai'dcs polyogrus Dyar, Ins. Ins. Mens., vi, 77, note, 1918. ( $ ) 



Mrs. Bonne- Wepster sends bred specimens from identical 

 larvae, the males with a silvery median mesonotal stripe, the 

 females entirely without this marked ornamentation. The 

 species is therefore sexually dimorphic. 



Aedes (Ochlerotatus) camposanus, new species. 



Female. Proboscis black-scaled. Occiput with flat white 

 scales, the erect forked scales on the nape brown, and giving 

 a brown shade to the posterior portion of the head. Meso- 

 notum with silvery white scales in a broad patch over the 

 anterior two-thirds, the anterior margin and posterior third 

 golden brown ; a yellow streak before the antescutellar space. 

 Rarely this white patch is golden yellow. Abdomen black 

 above, with lateral triangular basal segmental silvery white 

 spots ; venter white with traces of apical segmental black bands. 

 in some specimens there are basal median white spots dorsally, 

 which form a continuous line on the last three segments. 

 Femora white, their tips black ; tibiae black with a broad white 

 line on the under side, not reaching base or apex, most dis- 

 tinct on the hind pair; tarsi black, with a white reflection 

 below, most distinct on the first joint. Claws toothed. Wing- 

 scales wholly dark. 



Male. Coloration as in the female. Genitalia with the side- 

 pieces long and slender, about four times as long as wide, 

 conical ; apical lobe rather small, nude ; basal lobe small, 

 rounded with few short hairs, a very stout spine on its margin. 



