126 INSECUTOR INSCITI^E MENSTRUUS 



Type, No. 21716, U. S. Nat. Mus. ; male, Trinidad River, 

 Panama, March 20, 1912 (A. Busck). 



The new subgenus is founded on the male genitalia, which 

 differ from Choeroporpa in the elliptical sucker-like termina- 

 tion of the clasp filament. The last plate of the unci ends in 

 a sharp tooth, recalling Microculex ; but the point is laterally 

 directed, not retrose. 



Culex (Mochlostyrax) alogistus, new species. 



Bronzy black. Occiput clothed with flat broad white scales, 

 only a few black ones present ; mesonotum dark brown, the 

 scales small, sparse and bronzy brown ; abdomen black above, 

 bronzy shaded, with lateral, basal segmental white spots in 

 both sexes ; legs black, the femora white below ; wing-scales 

 black, those on the second to fourth veins ovate. A small, 

 dark species with white head. 



Types, No. 21914, U. S. Nat. Mus., four males and one 

 female ; bred from larvae in temporary pools, lying on their 

 backs on the bottom, Surinam (Mrs. J. Bonne- Wepster). 



The male genitalia are distinctive ; characters in general of 

 hesitator D. 8z K., but the basal lobes of the penultimate seg- 

 ment enormously developed, bearing long hairs that reach to 

 the tips of the side-pieces. 



The larvae have typical Mochlostyrax structure. 



Psorophora (Psorophora) ctites, new species. 



Entirely as in P. ciliata Fab., except for the absence of the 

 raised scales on the legs, palpi and base of proboscis. Head 

 with median bare space, the scales flat and white ; bristles 

 yellowish ; some erect slender black scales behind. Mesonotum 

 with a median line of golden yellow scales, subdorsal area 

 nude ; lateral areas with flat white scales. Abdomen wholly 

 gray-scaled posteriorly, with lateral areas of blackish scales in 

 front ; venter with sparse gray scales. Legs black-scaled, the 

 scales appressed, none broadly spatulated or erected; femora 

 pale beneath ; tarsi with white rings at the bases of the joints, 

 becoming smaller outwardly, the fifth joint not ringed. Wings 



