148 American Midland Naturalist Monograph No. 3 



Venter yellowish scaled, except for segment VII, base of VI, and occasionally 

 base of V, dark scaled. Legs: Pale knee spots absent. Femora I and II violet 

 scaled except for pale inner surfaces (outer surface of femur I pale at base) ; 

 femur III with basal two-thirds pale on all aspects. Tibiae and tarsi of fore 

 and middle legs entirely dark scaled; segments 4 and 5 of hind tarsus, and 

 sometimes the apex of segment 3, white scaled, other segments dark (segment 

 4 rarely with a few dark scales); scales of hind tibia and of segments 1 to 3 

 of hind tarsus somewhat suberect. Wing: Scales narrow, dark. 



ADULT MALE. (Head characters adapted from Roth, 153). — Coloration 

 similar to that of female. Proboscis slender, distinctly swollen apically. Palpus 

 with the last two segments not appreciably stouter than preceding segments. 

 Antenna extending well beyond apex of the third palpal segment; the last two 

 antennal segments comprising at least half the length of the entire antenna. 

 TERMINALIA (Fig. 76). Ninth tergite (IX-T) greatly modified, with lateral 

 portions separated by a strongly chitinized median structure; this structure is 

 narrow basally (anteriorly), broadened beyond middle into a pair of elongate 

 lateral projections, constricted subapically, broadly truncated at tip and often 

 with a median terminal tooth. Tenth sternite (X-S) heavily sclerotized beyond 

 middle; dorsal arm large, curved. Phallosome (Ph) ovoid, bluntly pointed at 

 apex, open ventrally, closed dorsally, the opening at base small and with a wide 

 lip. Cldspette (CI) slender, unequally bifurcate; the shorter branch armed with 

 a long slender curved spine at tip and a strong seta arising from a tubercle 

 near base; the longer branch bearing a long slender curved spine at tip and two 

 spine-like setae arising from a short stout projection at basal third. Basistyle 



Fig. 76. Male terminalia of Psorophora longipalpus Roth. 



