INSECUTOR INSClTlvE MENSTRUUS 177 



black upright forked scales and flat white scales at the sides. 

 Mesonotum with pale golden brown, narrow curved scales on 

 anterior half of mesonotum, brown on posterior half. Abdo- 

 men black above, with narrow white basal bands except on the 

 two first segments. Lateral basal, segmental spots. Venter 

 dark with pale basal bands. Wings hyaline with broadly 

 elliptical scales. Legs bronzy brown. Claw formula : 

 1.1-1.1-0.0. 



Genitalia : Side-pieces with a simple clasp-filament ; a di- 

 vided lobe on outer third ; outer division with a large leaf 

 and a seta, inner division with a heavy stout spine and a seta 

 at its base. Between the lobe and the apex of the side-piece 

 a large scale-like structure. Unci with several plates, one 

 blade-like at the base of the side-piece. Harpes slender, with 

 comb-shaped tip with seven broad teeth. 



Only one male, bred from a ditch, Alkmaar, March, 1919 ; 

 near Ciilex ensiformis. 



Culex (Mochlostyrax) curopinensis, new species. 



The adults show no tangible differences from Culex {Moch- 

 lostyrax) alogistus Dyar. The larvse also look very similar, 

 but the genitalia are distinct. 



Side-pieces with a lobe, extending from the middle to near 

 the tip ; divided into three portions, outer bearing three rods, 

 a small leaf-like appendage and a seta, others bearing each a 

 long filament with tapered recurved tip. Clasp-filament stout, 

 with foot-shaped tip. Harpes with comb-shaped tip. Second 

 uncal plate ending in three points, middle one with distinct 

 radial pecten. Two appendages at the base of the genitalic 

 structures, partly chitinized and finger-shaped, this chitinized 

 part bearing at least one long seta. 



The basal lobes of alogistus are much larger. 



Culex curopinensis is common all over the colony through- 

 out the year. 



Cotype, No. 22710, U. S. National Museum. 



Culex (Mochlostyrax) multispinosus, new species. 



We do not see differences in the adults from Culex (Moch- 



