124 INSECUTOR INSCITI^ MENSTRUUS 



basal segmental spots ; showing white basal bands in the male 

 after the second segment ; venter whitish, the segments apically 

 banded with black. Legs bronzy black, knee-spots and tips of 

 tibiae narrowly whitish ; femora pale beneath. Wing scales 

 brown, ovate, spinose along costal edge. 



Male genitalia. Clasp filament simple, constricted at basal 

 third, the spine subterminal, widened and appendiculate ; side- 

 piece about twice as long as wide, conical, excavate at the base ; 

 lobe divided, a basal portion nearly sessile consisting of four 

 spines, one stouter and on a more elevated pedicel ; outer 

 division pedicellate, of four short spines and a large leaf-like 

 appendage. Harpes long-stemmed, comb-shaped, with 8 or 9 

 teeth. Unci with the basal plate slender and recurved into a 

 pair of hooks ; two pairs of slender upright plates, the central 

 one denticulate ; sublateral plate very large, bifid, the inner 

 arm forming a large horn-like plate, the outer one finger- 

 shaped and sinuate. 



Types, No. 21714, U. wS. Nat. Mus. ; male and female, Man- 

 dingo River, Panama, bred from larv?e associated with Pistia 

 (L. H. Dunn). 



Culex (Choeroporpa) tecmarsis, new species. 



Head with a narrow area of small scales in the nape, not 

 reaching the vertex, the remaining scales broad and flat, black 

 and white, the white predominating. Mesonotum pale brown, 

 with darker longitudinal linings, clothed with dense narrow 

 curved bronzy brown scales and black bristles, the general 

 effect dark brown. Abdomen black dorsally in both sexes; 

 lateral spots faint, pale, alike in both sexes ; venter pale, very 

 broadly banded with black at the apices of the segments. In- 

 tegument of pleura and leg-bases dark brown ; legs black, the 

 femora paler beneath, but still of a brown tint. Wing scales 

 dark brown, ovate, only the outstanding ones on base of third 

 vein ligulate. 



Male genitalia. Clasp filament narrowly snout-shaped, the 

 tip distinct and upturned, the spine widened and appendiculate ; 

 eye-shaped insertion of the seta proportionately large ; dorsal 

 aspect finely pilose. Side-pieces twice as long as wide, 



