60 Journal New York Entomological Society. [Voi.vii. 



26. Second ventral segment 7i'ith a small longitudinal impression on each side towards 



the middle, tilled with a pubescence resembling dull black felt. 



Stenotnutillla Andre. 



Second ventral segment luithotit such impressions. 



Front wing with two submarginal cells, the third entirely obliterated 30 



Front wings with three submarginal cells, or the third partially formed, not 

 entirely obliterated 27 



27. Stigma more or less well developed, truncate or rounded at apex 28 



Stigma not well developed, minute. 



Marginal cell rounded, not truncate at apex, the third submarginal cell along 

 the radius very .short, shorter than the second ; me.sonotum with distinct 

 furrows on the posterior half or two-thirds, obliterated anteriorly. 



Mandibles at apex tridentate ; first joint of flagellum about half the length 

 of the second Dasylabrls Radoszk. 



28. Stigma well develojjcd, oblong oval, rounded at apex ; the luargiiial cell usually 



short 29 



Stigma not so large or well developed, obliquely truncate at apex or sublanceo- 

 late, often clear or open in the middle. 

 Marginal cell broadly truncate at apex. 



Mesonotum without distinct furrows at the most with an indistinct furrow 



on the shoulders ; third submarginal cell ahjng the radius fully 



twice as long as the second, or even longer ; pygidial area distinct. 



Mandibles at apex broad, tridentate, with a slight sinus or emargi- 



nation beneath nearly the middle. 



Sphserophthalma Blake (Type S. sccwa Blake) 



Mandibles toward a]iex more or less bluntly pointed with usually 



one tootli within tjefore apex ; body densely clothed with long hair. 



Dasymutilla Ashm. g. n. (Type S. gorgons Blake) 



29. Marginal cell rounded, not truncate at apex. 



Mesonotum ivith four more or less distinct furrows. 



Eyes extending to base of mandibles or nearly ; ocelli large. 



Mandibles not excised beneath, of an equal thickness to apex, where 



they are truncate and tridentate, the teeth nearly of an equal size. 



Photopsis Blake (Type P. iinperialis Blake) 



Mandibles strongly excised or emarginate beneath from near the 



middle to apex and usually with a process or projection before the 



incision, bi- or tridentate, the teeth very unequal. 



Tricholabiodes Radoszk. 



30. Stigma not well developed, indistinct ; mesonotum luithotit furrows ; abdomen 



distinctly petiolate Dasy labris Radoszk. 



Stigma well developed ; mesonotum with furrows ; abdomen .subpetiolate. 



Head large, quadrate, armed beneath with four teeth, two at base of gula and 

 a very large tooth or spine on each cheek beneath ; ocelli small. 



Hoplomutilla Ashm. g. n. 

 Head normal, unarmed, subquadrate or subglobose. 



Ocelli not large, mandibles not excised beneath. . Cystomutilla Andre. 



Ocelli large, ])rominent ; mandibles excised or sinuate beneath, at apex 



bidentate Photopsis Blake (pars) 



