INSECUTOR INSCITI^ MENSTRUUS 93 



pygium. The inner area of the side-piece is normally weakly 

 chitinized, and in the usual form shows no differentiation. In 

 the present form there is an angular thickening about the mid- 

 dle, encroaching on the weak inner area. The coloration of the 

 adults is as usual, the male with the mesonotum silvered across. 

 the female with dark central band. 



Type No. 25253, U. S. Nat. Mus. ; three males, Alajuela, 

 Costa Rica, August and October, 1921 (A. Alfaro) ; Cordoba, 

 Mexico, March 7, 1908 (F. Knab). 



Culex (Choeroporpa) pose Dyar & Knab. 



Mr. G. H. Bradley is the fortunate discoverer of the male of 

 this species, which proves to be abundantly distinct. The species 

 was bred at Mound, Louisiana. 



Male hypopygium. Side-piece somewhat swollen, curved, 

 convex, a lunate area of fine hairs on the convexity. Clasper 

 constricted in the middle, a little less than the apical half 

 swollen, parallel sided and elliptical, a crest of short fine pile 

 on the anterior declivity ; lower termen projecting and upcurved, 

 crossing the elliptical appendiculate spine ; a sinuous groove 

 from the spine base; one seta at the upcurve of this groove, 

 and another near the base of the enlargement. Outer division 

 of lobe of side-piece with a slender and rather long stem, a 

 large quadrately expanded leaf in the outer setal group, about 

 as long as the setae, which are all flattened and curved ; inner 

 arm short but distinct, with the usual hooked filament and short 

 accompanying one. Inner division of lobe of side-piece with 

 some minute spines at base, furcate, the arms unequal, the 

 inner only about half as long as the outer, each with a long 

 sinuate filament with expanded hooked tip. Tenth sternites 

 with long slender stem and comb-shaped tip, about ten teeth 

 in comb. Second mesonomal plate broad, the tip curved out- 

 ward at right angles, furcate, both arms pointed and smooth, 

 the lower the longer ; a third long sharp point on the stem at 

 the base of the outward curve, being subapical. Ninth tergites 

 large, elliptical, with many setae, approximate and outwardly 

 oblique. 



