92 ENTOMOLOGY FOR MEDICAL OFFICERS 



argyrotarsis. The stated difference is that there is a narrow 

 black band at the base of the last tarsal segment of the hind 

 legs, but in the London School of Tropical Medicine there is 

 a specimen which has this band on one hind leg but not on 

 the other. West Indies and Tropical South America. 



Anopheles {Cellid) braziliensis , Peryassu. Differs from 

 argyrotarsis in having the tip of the abdomen white from the 

 presence of abundant white scales. The three spots of the 

 costa are larger and not so sharply circumscribed. Brazil. 



Anopheles {Cellid) bigotii, Theobald. Palpi with three 

 white bands and white tip. In the hind legs the ist tarsal 

 segment has a white terminal band, the 2nd has a white tip, 

 and the 3 last are white. Scutum with four longitudinal lines 

 of light scales. Chili. 



Subgenus Cl-IAGASIA, Cruz. 

 Including Chagasia and Myzorhynchella of Theobald. 



The scutum is covered with distinct scales of considerable 

 breadth, and more or less recumbent. The vestiture of the 

 abdomen consists of hairs, but there may be some narrow 

 scales (inconspicuous) on the genital lobes. The wings have 

 a dark cast, though they may be spotted ; the wing-scales are 

 of considerable breadth. The palpi are shaggy with scales, 

 and the legs are either profusely barred, or have some of the 

 tarsal segments white. Some of the antennal segments carry 

 whorls of scales. On the head broad semi-procumbent scales, 

 which are not forked, predominate, and it is this character, 

 chiefly, that separates the subgenus from NyssorJiynchus. 



The species are restricted to the Neotropical Region. 



Anopheles {Chagasia) fajardii, Lutz. Head rather sparsely 

 covered with broadish falcate scales and a few black bristle- 

 like forked scales. Antennae with particularly thick whorls 

 of scales on the 2nd to the 7th or 8th segments. Palpi 

 with very faint indications of pale rings at the inter- 

 segmental joints. Legs banded in alternate rings of yellow 

 or yellowish-white and brown, the bands of the tarsi of the 

 hind legs being very broad. Wings dark without any notice- 

 able spots. No scales on the abdomen. Rests like a Culex. 

 Brazil. 



