Genus Chagasia. 123 



The very distinctive generic characters are (i) the dense long 

 outstanding scales at the sides of the thorax, and (ii) the whorls 

 of prominent scales on the antennal segments. 



A single species only is known. It is peculiar in regard to 

 the position it assumes when at rest. The head and its 

 appendages and the thorax form a very marked angle with the 

 abdomen. The greater part of the fore legs lie parallel with the 

 head and thorax and the tibiae of the mid and hind legs with the 

 abdomen. Thus it assumes more the position of Culex than 

 Anopheles. 



Chagasia pajardi. Lutz (in Bourroul) (1904). 

 Pyretojphorus fajardi. Lutz (in Bourroul) (1904). 

 Pyretophorus fajardoi. Blanchard (1905). 

 Chagasia nivae. Cruz (1906.) 



Mosq. do Brasil, pp. 16, 36, 64 (1904), Lutz; Les Moust., p. 623 (1905), 

 Blanchard; Brazil-Med. XX., 20, p. 199 (1906), Cruz. 



The following is Lutz's original description : — 



" Total length 5 mm. (without proboscis which is 2 mm.). 



Proboscis, of the same length as the palpi, of a uniform dark colour 

 with a few dark scales. 



Palpi. — Densely covered with scales, at the joints paler rings without 

 scales, scales black. Clypeus dark with white sheen. 



Antennae with some dark scales on the basal segment ; basal part of 

 the scourge is dark; but four or five segments lighter ; at the base of the 

 segments distinct bunches of dark spatulate scales; verticillate hairs 

 dark, the shorter ones are fine with a white sheen. 



Occiput. — In the centre are pale hairs directed towards the front ; on 

 the sides darker hairs and long curved scales of a light yellow colour, and 

 others filiform and with a bifurcated apex, nearly all black. 



Prothorax with pale hairs and long curved scales, yellow and black. 



Mesonotum. — On the anterior part yellow with a golden sheen (as in 

 Culex confirmatus), fusiform scales of this colour placed in longitudinal 

 rows, hinder part dark with mixed white gold and black hairs ; the sides 

 with black scales fairly long forming groups ; ground colour of mesonotum 

 where seen dark fawn. Scutellum with a few yellow scales. 



Legs dark brown or black, with a great many spots and rings. Femora 

 of the two first pair, swollen apically ; the first tarsal has five white 

 rings, others white so that there are eight rings on the foot ; on the mid 

 legs twelve rings more or less perfect, last tarsal being quite black ; on 

 hind legs the tarsals are white with black apex, but at end have yellowish 

 white rings, knees and venter of femora yellow, these and the tibiae 

 have a great many patches and incomplete rings of a yellow colour. 



