INSECUTOR INSCITI^ MKNSTRUUS 57 



triangular membrane, which folds across the plate and forms a 

 retrose angle on the side ; stem slender, no third projection. 

 First uncal plate triangularly widened, reaching the fork of the 

 second plate and bearing a sharp horn on the outer side about 

 the middle. Basal hooks rather long. Basal appendages mod- 

 erate, with many hairs. 



Type, male. No. 22733, U. S. Nat. Mus. ; Surinam, without 

 further data, "two larvae found in a pool in a stream-bed" 

 (J. Bonne- Wepster), sent under No. BB232, July 20, 1917. 

 The specimen from which the mount of the genitalia was made 

 has been mislaid. Mrs. Bonne-Wepster identified it with Culex 

 elevator D. & K. at the time, which it must closely resemble. 



Culex (Choeroporpa) ybarmis, new species. 



Clasp-filament rather stout, the tip somewhat horn-like, spine 

 appendiculate ; dorsal pile short and scant. Outer division of 

 lobe of side-piece slender, curving a little toward apex ; a long 

 filament inserted near the base on the inner side ; a slender 

 filament subapically, also on the inner side ; tip with three short 

 triangularly expanded filaments, forming small leaves. Inner 

 division of lobe slender, columnar, bearing two long filaments 

 with twisted expanded tips, the inner one inserted a little basad 

 of the other but not separated. Second uncal plate furcate, 

 both limbs rather horn-like, broadly emarginate ; a sharp 

 double angle near middle of first plate is probably the tip of 

 the fourth plate and not a point on the stem of the first plate. 

 With only the single mount it is difficult to be certain. Basal 

 hooks short, broad, scarcely recurved. Basal appendages 

 large, elliptical, setose, contiguous. 



Type, male, No. 22734, U. S. Nat. Mus. ; "ground-pool near 

 Paramaribo," Surinam (J. Bonne-Wepster). The adult has 

 the mesonotum entirely dark brown, clothed with small spinose 

 scales. Head with mostly oval flat white scales and many 

 erect forked black ones. Palpi exceeding the proboscis, 

 pointed, black. Abdomen with very narrow segmental white 

 bands, the venter black and white banded. Legs black, with- 

 out knee-spots, the femora whitish beneath. 



