140 



American Midland Naturalist Monograph No. 3 



arated, each bearing several scattered setae. Tenth sternite (X-S) prominent, 

 heavily sclerotized. Phallosome (Ph) heavily sclerotized, conical, broad at base, 

 narrowly rounded at apex, closed dorsally, open ventrally; apical half with a 

 lateral flange and a mid-dorsal longitudinal basally divaricated carina. Clas- 

 pette (Cl) (exclusive of the apical filaments) reaching middle of basistyle or 

 slightly beyond; stem slender, curved, its mid-portion fused to the basistyle, 

 expanded apically into a broad triangular crown. Crown with about nine elon- 

 gated pointed flattened filaments (filaments nearest basistyle larger, curved), 

 and several feathered setae. Basistyle (Bs) nearly two and one-half times as 

 long as broad, cylindrical, bluntly rounded at apex, clothed with sparse scales 

 and numerous long setae; basal and apical lobes absent. Dististyle (Ds) reticu- 

 lated, about three-fifths as long as basistyle, moderately expanded a little 

 beyond middle (expanded inner margin pubescent and with four or five short 

 spines), tapering distally, slender and curved near tip and terminating in a 

 peg-like claw (Ds-C). 



larva. (Fig. 72). — Head broader than long. Antenna stout, shorter than 

 head, coarsely spined; antennal tuft small, 2 to 4-branched, sparsely barbed, 

 inserted slightly beyond middle of shaft; tip of antenna with three long spines, 

 one short spine and a membranous papilla, all apical in position. Head hairs: 



-IXT-L 



IX-T 



Fig. 71. Male ferminalia of Psorophora c^anescens (Coquillelt). 



