916 MOSQUITOES OF NORTH AMERICA 



lateral tufts of first two segments long, multiple, obsolete on other segments; 

 secondary hairs in distinct stellate tufts. Tracheal tubes slender, flexuous. 

 Air-tube slender, uniform, about five times as long as wide; pecten of uni- 

 formly spaced small teeth, a large tuft at the middle beyond pecten; single 

 pecten teeth narrow, tapered, fringed on the sides with spinules, the tip smooth. 

 Lateral comb of eighth segment a row of scales on the edge of a large lateral 

 chitinous plate, the single scales conical and fringed with long thick spines. 

 Anal segment about as long as wide, ringed by the plate, which has a row of 

 spines along posterior edge ; dorsal tuft of three hairs on each side ; a small 

 lateral tuft ; ventral brush moderately well developed, confined to barred area ; 

 anal gills short, about as long as the segment, tapered. 



Life history and habits unknown. 



Southern United States. 



Baton Eouge, Louisiana, September 6-9 and October 23, 1904 (J. W. 

 Dupree) ; Jackson Barracks, Louisiana, August (M. P. Chamberlain). 



Uranotcenia continentaKs was founded on the larva, and, although the char- 

 acters then indicated are without value, adults since received show that the 

 species is distinct from Uranotcenia lowii, but very closely allied thereto. In 

 continentalis the two dorsal, mesonotal, bare pale stripes are much narrower 

 than in lomi, the silvery-blue spot on the vertex is absent on most of our speci- 

 mens and the femora and tibiae are not marked with white, as they are in lowii. 



URANOTiENIA COATZACOALCOS Dyar & Knab. 

 Uranotcenia coatzacoalcos Dyar & Knab, Journ. N. Y. Ent. Sec, xiv, 186, 1906. 

 Original Desckiption of UEANOTyENiA coatzacoalcos: 



The antennaa are stout, with a single stout hair at basal third and two short 

 spines on the other side; at tip two long hairs, not as long as the antennae, a short 

 one and a sharp angle; a long double blade-like digit that appears to be divided to 

 the base, one part dark and about two-thirds as long as that longer pale portion. 



The larvae were collected by the junior author at Santa Lucrecia, Mexico, in the 

 valley of the river Coatzacoalcos. They were not bred. The larvae occurred in a 

 ditch full of vegetation. 



The following is an abstract of the table : 



1. Antennae with scattered spines; longest terminal seta shorter than 



antenna 2 



2. Terminal setae three, the short one obsolete 3 



3. Shaft with but two spines; terminal digit double coatzacoalcos 



Descbiption of Larva of Uranot^nia coatzacoalcos (Female and Male Unknown) : 

 Larva, Stage IV. Head rounded, elongate, longer than wide, bulging at the 

 sides, front margin with a slight median emargination and a stout sharp promi- 

 nence each side of it, a deep notch at insertion of antenna. Antennae cylindri- 

 cal, small and stout, basally thickened, with a few scattered spines and a single 

 short hair at basal third; four large apical spines of irregular length and a 

 stout digit with a basal branch. Eyes moderate, pointed. Both pairs of dorsal 

 head-hairs single, very stout and thick ; a two-haired tuft below ; ante-antennal 

 tufts multiple. Mental plate triangular, with a central tooth and five on each 

 side, the last one small. Mandible quadrangular, rounded ; four filaments and a 

 large tuft of hairs before tip ; a row of stiff cilia surrounding dentition ; denti- 

 tion of four teeth on a thick process, the second tooth much the largest ; a small 

 tooth and a larger double one at base, a broad plate with irregularly serrate edge 

 and two slender filaments within ; two delicate superposed hemispherical plates 

 at basal articulation, serrate on the edge, fringed with hairs outwardly ; a basal 



