238 American Midland Naturalist Monograph No. 3 



Lateral basal patches of abdomen while, sharply defined; abdominal segments 

 entirely dark dorsaliy (rarely with very narrow white basal bands), VII 

 entirely dark scaled except for white lateral patches; scales of scutum dark 

 brown; pleura with few or no scales (if scales present, rarely more than 5 or 

 6 in any single group) nigripalpus Theob., p. 242 



MALE TERMINALIA 



1. lOth sternite crowned apically with a comb-like row of blunt teeth 2 



10th sternite crowned apically with a dense tuft of short spines 6 



2. Subapical lobe of basistyle not divided into two main trunks; lateral plates of 



phallosome columnar, blunt and denticulate at apices, connected at apical 



fourth by a narrow transverse bridge (Subgenus N eoculex) 



apicalis Adams, p. 272 



Subapical lobe of basistyle deeply divided into two main trunks; lateral plates 

 of phallosome not columnar, without a narrow subapical connecting bridge 

 (Subgenus Melanoconion) 3 



3. Lobes of 9th iergite slender, finger-like, widely separated, the tips slightly con- 



vergent pilosus (D. and K.), p. 268 



Lobes of 9th tergite inflated, the bases contiguous or separated by no more than 

 the width of one lobe 4 



4. Basistyle very large, subspherical ; dististyle quadrately expanded apically 



peccator D. and K., p. 265 



Basistyle moderate in size, only about half as broad as long; dististyle not 

 quadrately expanded apically 5 



5. Lobes of 9th tergite large, ovate, contiguous at bases, widely divergent apically, 



clothed on all aspects with numerous long smooth setae 



erraltcus (D. and K.), p. 262 



Lobes of 9(h tergite large, pyriform, separated basally by nearly the width of 

 one lobe, divergent apically, clothed on basal half with numerous long feath- 

 ered and smooth setae, the apical halves bare and tapered 



atratus Theob., p. 260 



6. Subapical lobe arising near middle of basistyle, stout, thumb-like, about twice as 



long as wide; apical armature consisting of three stout rods, shorter than the 



lobe - bahameusis D. and K., p. 240 



Subapical lobe arising near apical third of basistyle, little if any longer than 

 wide; apical armature consisting of a variable number of appendages, all 

 longer than the lobe 7 



7. Subapical lobe with 8 appendages, one of which is a broadly expanded leaf- 



like filament; basal arm of 1 0th sternite represented by a short protuberance, 



never long and curved -— 8 



Subapical lobe with 5 or 6 appendages, one of which may or may not be a 

 broadly expanded leaf-likS filament; basal arm of 1 0th sternite long, curved 9 



8. Ventral arm of phallosome large, weakly sclerotized, broadly wing-like, curved 



outwardly, tapered to a point; dorsal arm of phallosome long, slender, straight, 

 pointed or narrowly rounded at tip, directed posteriorly and crossing over the 



ventral arm nearly at right angle to its wing-like outward extension 



quinquefasciaius Say, p. 247 



Ventral arm of phallosome large, moderately sclerotized, narrowly wing-like, 

 curved outwardly, tapered to a point; dorsal arm of phallosome long, slender, 

 straight, truncate or bluntly rounded at tip, directed postero-laterally and 



obliquely crossing over the wing-like lateral extension of the ventral arm 



pipiens Linn., p. 245 



9. Leaf-like filament of subapical lobe narrow; crown of 10th sternite with outer 



spines blunt tarsalis Coq., p. 257 



Leaf-like filament of subapical lobe very broad; crown of lOth sternite either 



with all spines pointed or with the outer spines blunt 10 



10. Each plate of phallosome with several stout teeth between the dorsal and ventral 

 arms; crown of 10th sternite either with all spines pointed or with outer spines 

 blunt; basal arm of 10th sternite heavily sclerotized 11 



