COCKERELL: FOSSIL HYMENOPTERA FROM FLORISSANT, 57 



examples similarly folded. This insect has the closest possible resemblance to a 

 species still living in Colorado, but it differs in the venation in two respects : (1) 

 the second submarginal cell is more contracted above, (2) the cubital nervure is 

 abruptly bent at the end oi the first discoidal cell, as in Vespa, whereas in the 

 modern species it is straight. 



Type. — No. 2033, Mus. Comp. Zool. Florissant, Col. (No. 10,657, S. H. 

 Scudder Coll.) 



Odynerus praesepultus, sp. nov. 



o. Black, apparently with two light longitudinal bars on mesothorax ; length 

 nearly 11 mm., head and thorax about 4 mm., anterior wing 7 mm. ; wings folded, 

 somewhat reddish; flagellum thick, (the end tapering, not clavate,) dark above, 

 light below ; abdomen sessile, second segment not swollen, dorsally or ventrally ; 

 in lateral profile, the dorsum of abdomen is gently curved, the venter nearly 

 straight, no segment markedly different from the one before it. Stigma large, its 

 width (short diameter) about 200 (this and other measurements in /*) ; marginal 

 cell subtriangular, 1350 long, about 450 broad, narrowly obliquely truncate, the 

 truncation about 150 broad ; tip of marginal cell about level with apex of third 

 s. m. ; b. n. inserted at base of stigma, its upper section about 450 long; first s. m. 

 1425 long ; stigma to insertion of first t. c, 450 ; second s. m. much narrowed above 

 (150 long on marginal), and receiving both recurrent nervures ; first r. n. from 

 origin of first t. c, 250 (lower basal corner of second s. m. very acute) ; distance 

 between insertion of first and second r. n., 300 ; cubital nervure not at all bent at 

 end of first discoidal; insertion of second r. n. to origin of second t. c, 105; lower 

 margin of third s. m., 600; third s. m. on marginal, 450; insertion of third t. c. to 

 apex of marginal cell, 450. 



Type. —No. 2034, Mus., Comp. Zool. Florissant, Col. (No. 11,944, S. H. 

 Scudder Coll.). This is readily known from Palaeovespa by (1) marginal cell 

 obliquely truncate at end, the tip not on costa ; (2) cubital nervure not at all 

 bent at end of first discoidal, (3) b. n. originating at base of the very large 

 stigma. It appears to be one of the. Eumenidae, the venation agreeing with 

 that group better than with the Vespidae. Among the Eumenidae, from the 

 venation and structure of the abdomen , it can go only in Odynerini, and it is 

 referred to Odynerus in the old, broad sense. The modern genera of Odynerini 

 are separated mainly on characters which are not discernible in the fossil. 



ICHNEUMONOIDEA. 



STBPHANIDAE. 



Protostephanus, gen. nov. 



Head rounded or subquadrate, rugose or tuberculate; prothorax broad but 

 produced, with a median longitudinal groove, and fine lateral oblique striae ; 

 abdomen sessile ; hind coxae elongated, about £ the length of their femora ; hind 

 femora moderately stout, not toothed; stigma rather large; costal cell very dis- 

 tinct ; terminal part of subcostal nervure, for a distance nearly equal to the length 



