54 Journal New York Entomological Society. [VoI. vil 



Abdomen 7vtthoitt a constriction between the first and second segments ; 

 scutellum quadrate ; first recurrent nervure joining the second submarginal 

 cell beyond the middle Milluta Andre. 



9. Front wings with three submarginal cells and two recurrent nervures lO 



Front wings with two submarginal cells. 



Only one recurrent, which is received by the second submarginal cell. 



Typhoctes AsHjh g. n. 9 

 Two recurrent nervures, both received by the second submarginal cell. 



Cyphotes Blake (pars. ) 



10. Second submarginal cell receiving both recurrent nervures. . . Cyphotes Blake. 



Family XLI. MUTILLID.E. 



The genera Scaptodactyla Burmeister and Scaptopoda Lynch- Arri- 

 balzaga, are not included in the following table, since I have not been 

 able to secure specimens, or to consult the descriptions ; the works in 

 which these genera are described not being in the libraries in Wash- 

 ington and Philadelphia. 



Table of Genera. 

 Males 15 



Females. 



1. Abdomen petiolate or subpetiolate, or 7vith a distinct constriction or furrow be- 



tween the first and second segments 8 



Abdomen sessile or subsessile, -without a constriction or furrow between the first 

 and second segments, the first segment uniting with the second its entire breadth. 2 



2. Thorax obpyriform, or narrowed posteriorly, or strongly contracted medially at 



sides, as seen from above often hexagonal 5 



Thorax quadrangular or cubiform, not narrowed posteriorly, rather abruptly or per- 

 pendicularly truncate behind, the dorsal profile straight, the lateral margins 

 parallel or scarcely perceptibly curved inwardly medially ; head most fre- 

 quently quadrate or subquadrate. 



Pygidium without a pygidial area .3 



Pygidium with a pygidial area, or at least with elevated lateral margins 4 



3. Antennal fove^e bounded by a carina superiorly. 



Head large, quadrate, wider than the thorax ; eyes oval ; mandibles broadened 

 towards apex, tridentate ; first joint of flagellum about twice as long as the 

 second or as long as joints 2-3 united ; lateral margins of thorax parallel. 



Myrtnilla IVesfnael. 



Head not so distinctly quadrate, more rounded, not wider than the thorax ; eyes 

 ovate or oval ; mandibles not broadened towards apex, bidentate, the outer 

 tooth the longer, acute ; first joint of flagellum longer than joints 2-3 united ; 

 lateral margins of thorax slightly curved inwardly medially. . . . Ronisia Costa. 



4. Antennal fovese not bounded by a carina superiorly 7 



Antennal foveae bounded by a carina superiorly. 



Head quadrate or subquadrate ; eyes moderately large, ovate, oval or elliptical, 

 but never round. 



