364 GNATS OR MOSQUITOES — CHAPTER XIII 



articulations, and on those between the first and second tarsal 

 joints of the fore and hind legs. Thorax dai'k brown, with a 

 broad median reddish line, forking behind and with curved lateral 

 lines of pale scales in front. Abdomen dark steel-blue, with six 

 lateral patches of white scales, and with golden hairs on the hind 

 borders of the segments. Proboscis nearly black, with a broad 

 creamy band in the middle, and the apex pale. Whole insect 

 generally deep brown. 



$ . — Head dark brown, with white curved scales dotted about and 

 black upright forked ones, a narrow pale border round the eyes, white 

 curved scales at the sides of the head ; eyes black ; antennae deep brown, 

 faintly pale banded, basal joint and base of the second joint testaceous ; 

 pal[)i with black scales at the tips of the joints, brown at their bases, 

 the apical joint white scaled, five-jointed ; proboscis dark, almost black, 

 with a broad creaniy-wliite band m the middle and with the apex pale. 

 Pleurie brown with a greyisli sheen and a patch of white scales. Legs 

 witli femora and tibiie black, speckled with a few white scales, the 

 former white beneath. Venter yellowish, the segments darker behind. 

 Halteres pallid throughout. Length. — 5 mm. 



Habitat. — Rio de Janeiro (1899) ; Navarro, in Argentina; Lower 

 Amazon (November). 



Although not of the characteristic yellow colour, this may be re- 

 garded as the type species of the genus, as it is tlie only one of 

 Arribalzaga's genus included in tlie group as now limited. 



Dr. Lutz writes concerning this species as follows : "It is a real 

 swamp mosquito, common in the littoral ; stings painfuUy, in preference 

 through the stockings, principally at dusk, or in tlie shade during the 

 daytime." 



8. TiENIORHYNCHUS RICHARDII (Ficalbi). 



= Culex Richardii, Ficalbi. 

 ("F. K." p. 261 ; "V, S." p. 151.) 

 Veins of the wings clothed with black scales with a few white 

 ones intermixed, the short rank of inner fringe scales all black. 

 Tarsal joints deep brown with yellowish basal bands. Thorax 

 chestnut-brown, with small golden scales, adorned with five or 

 six pale lateral spots. Abdomen black with five or six bright 

 yellowish-white trapezoidal spots along the sides. Proboscis 

 black with a very broad band occupying more than the middle 

 third of its length. 



$ . — Head brown, with narrow curved very pale creamy scales, which 

 become almost white at the sides of the head, and with whitish eye- 

 borders; the nape with ochreous and black upright forked scales ; antenuie 

 brown, with narrow pale rings, basal joint bright, pale ferrugmous, also 

 the base of the second joint ; palpi yellowish-brown, densely covered 



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