CULEX ERYTHEOTHORAX 315 



of dark-brown bristles. Postnotum elliptical, prominent, dark brown, nude. 

 Pleurffi and coxjb dark brown with rows of pale bristles. 



Abdomen subcylindrical, depressed, truncate at tip ; dorsal vestiture of black- 

 ish-brown scales and a row of pale bristles at tip of each segment, a row of 

 lateral, basal, segmental, triangular yellowish-white patches ; venter yellowish- 

 white scaled, the two last segments broadly black at their tips. 



Wings moderate, hyaline ; petiole of second marginal cell one-fourth as long 

 as its cell, that of second posterior cell considerably shorter than its cell ; basal 

 cross-vein distant more than its length from anterior cross-vein ; scales of veins 

 brown, with a blue reflection on costa, the outstanding ones ovate, dense on third 

 vein, forks of second and fourth, and upper branch of fifth. 



Legs moderate ; middle femora stout ; vestiture of black scales with bronzy 

 and blue reflection, underside of femora whitish. Claw formula, 0.0-0.0-0.0. 



Length : Body about 3 mm. ; wing 3 mm. 



Life history and habits unknown. 



Panama. 



Colon (A. C.H. Russell). 



We have seen but a single female specimen. Neither Mr. Busck nor Mr. 

 Jennings has been able to find the species. It is allied to Culex spissipes, and, 

 possibly, but a variety thereof. Our material of both species is, however, too 

 slender to allow us to form a positive opinion. 



CULEX ERYTHROTHORAX Dyar. 



Culex erythrothorax Dyar, Proc. U. S. N. M., xxxii, 124, 1907. 

 Culex erythrothorax Theobald, Mon. Culic, v, 615, 1910. 



Original Desceiption of Culex eeythbothobax : 



Head golden, reddish scaled behind, the eyes with a narrow white border; pro- 

 boscis blackish; palpi red brown; antennae black. Thorax light red, the scales fine, 

 golden brown, striped by two impressed discolorous areas in the membrane; sides 

 light golden scaled; legs blackish, the femora and tibiae broadly pale below, un- 

 handed. Abdomen black above, mixed with pale ocherous scales, the bases of the 

 segments with rather pale ocherous bands mixed with a few dark scales; beneath 

 with pale ocherous scales and golden hairs. 



Eighty specimens, Nigger Slough, Gardena; slough at San Onofre; Sweetwater 

 Junction, swamp full of reeds; Guadaloupe, slough covered with reeds (A. N. Cau- 

 dell) ; Salinas, California, a pool in a river bed choked with vegetation. 



Type. Cat. No. 10009, U. S. N. M. 



The adults could only be taken in the midst of the tall reeds that covered shallow 

 sloughs by wading into the water. A person sitting on the bank was immune from 

 their attacks, but among the reeds they bit viciously in the daytime. The larvae 

 occurred among the reeds, resting quietly at the surface in the Lemna, though fish 

 were present in all the sloughs. Culex tarsalis and Anopheles were generally present 

 also, the mass of vegetation doubtless shielding them from the fish. 



Desceiption of Female, Male, and Larva of Culex eeythrothoeax: 



Female. Proboscis moderate, subcylindrical, uniform, labellae conically 

 tapered ; vestiture of black scales with a pale bronzy reflection, whitish beneath ; 

 setae minute, curved, black, those on labellse more prominently outstanding. 

 Palpi short, one-sixth as long as proboscis, slender, reddish brown, with few out- 

 standing setae, black scaled. Antennae with joints subequal, rugose, pilose, black, 

 second joint slightly swollen, pale at base ; tori subspherical with a cup-shaped 

 apical excavation, yellowish, darker within; hairs of whorls sparse, moderate, 

 black. Clypeus rounded triangular, doubly excavated at base, reddish brown, 

 nude. Occiput orange brown, clothed with narrow, curved golden-brown scales, 

 sordid whitish along margins of eyes and lower parts of sides, the scales on lower 

 part of sides flat, appressed ; many erect, forked brown scales on nape ; a row of 

 black bristles along ocular margins. 



