INSECUTOR INSCITI^ MENSTRUUS 35 



but without basal arm. Ninth tergites large at base, long, 

 tapering and finger-shaped with a tuft of long hairs at the tip. 



Type, male, No. 33938, U. S. Nat. Mus. ; Atirro, Costa Rica, 

 elevation 600 meters, October 24, 1920 (A. Alfaro). 



The male type is much damaged and shows little that is 

 characteristic in coloration ; the structure of the hypopygium 

 places it close to tecmarsis Dyar. 



Culex (Choeroporpa) holoneus, new species. 



Palpi, proboscis and legs black ; mesonotum dark brown, 

 the narrow curved scales slightly golden under the microscope ; 

 abdomen black, with narrow white basal segmental bands, 

 widening on the sides ; venter pale ; the apices of the segments 

 broadly dark. Wing scales rather broadly ovate on the forks 

 of the second vein outwardly. 



Hypopygium. Side piece swollen basally, the tip narrowed 

 and conical, coarsely setose ; an area of fine setae on the inner 

 aspect. Clasper attenuated centrally, the tip narrowly snout- 

 shaped, excavate a little beneath, where there is a seta, and 

 around which the median groove makes an arc ; a short crest 

 of pile on top ; subterminal spine widened and appendiculate, 

 unusually large. Outer division of the lobe of side piece with 

 a slender inner arm, bearing a long hooked filament and a 

 l)Iade-like one; on the stem below the fork, a very large ex- 

 panded leaf is inserted, the base and margins radially rein- 

 forced, the tip thin and indefinite ; outer limb with a group of 

 rather long appressed filaments ; inner division of the lobe of 

 side piece with the limbs divaricate and subequal, each bearing 

 a long curved filament with expanded hooked tip ; some minute 

 pilosity in the angle between the two divisions of the lobe of 

 side piece. Mesosome greatly reduced, apparently absent, in 

 its place a pair of small pointed simple appendages, fimbriate 

 on tlie inner side, the tip forming a retrose point. Tenth stern- 

 ites comb-shaped, with about seven teeth, the basal shoulder 

 produced into a thumb-like arm. Ninth tergites large, oblique, 

 thick, conical, with fine setae uniformly distributed, rather 

 sparser at the tip. 



