COOKERELL: FOSSIL HYMENOPTERA FROM FLORISSANT. 47 



(6) Third s. m. very much broader above, being equally broad (1050 /u) above 

 and below. 



(7) Prothorax, mesothorax, and metathorax longitudinally striate, especially 

 the prothorax. (Very faint striation of the prothorax is visible in P. albifrons.) 



Other characters are : width of third discoidal at base somewhat less than 

 greatest width of first discoidal ; first t. c. not angulated at basal third ; second 

 discoidal cell more than twice as long as its width at apex ; cubital nervure not 

 bent, but slightly curved downwards, at end of first discoidal ; lower section of 

 b. n. (bordering first discoidal) about twice as long as upper. 



Prophilanthus destructus, sp. nov. 



Length about 20 mm., robust, with a thick sessile abdomen, which appears to 

 have had very broad black bands alternating with narrower yellow ones ; antennae 

 6 mm. long, ordinary, the scape thick, flagellum black ; length of anterior wing 

 12£ mm. ; costa, up to base of marginal cell, broadly and very deeply infuscated, 

 apex also clouded; marginal cell 3 mm. long, only just surpassing apex of third 

 s. m. ; first s. m. 3 mm. long; second and third submarginal cells combined, on 

 cubital nervure, 3 mm. long; first discoidal cell 4| mm. long, or nearly; second 

 r. n. nearly straight, slightly bowed outwards ; second s. m. very broad below ; 

 origin of first t. c. to insertion of first r. n., 450 ft; insertion of first r. n. to origin 

 of second t. c, 975 /* ; origin of second t. c. to insertion of second r. n., less than 

 150 fi. 



Type. —No. 2017, Mus. Comp. Zool. Florissant, Col. (No. 7762, S. H. 

 Scudder Coll.). 



NYSSONIDAE. 



Hoplisidia, gen. nov. 



Size rather large ; thorax hairy, the hairs long and quite simple ; abdomen sub- 

 cylindrical, broadest at the apex of second segment; first segment comparatively 

 small, but not petiolate ; apex pointed ; the form of the insect like Gorytes or 

 Hoplisus ; stigma very narrow, almost obsolete ; three submarginal cells, the first 

 at least as long as the other two combined, the b. n. joining subcostal very far 

 basad of the stigma; second s. m. broad, receiving the recurrent nervures near the 

 end of the first and second thirds, the second r. n. curved and bent backwards to 

 its point of insertion ; third s. m. about twice as broad below as above ; marginal 

 cell narrowly rounded at apex; first discoidal conspicuously longer than marginal; 

 b. n. sharply bent at origin of cubital ; b. n. meeting t. m., or practically so ; hind 

 wings with cubital nervure exactly meeting t. m., which goes downwards for a 

 short distance, and is then bent, finishing its course very obliquely. Among the 

 Gorytinae, this falls closest to Hoplisus by the venation of the hind wings. It is 

 peculiar for the very long first s. m., the b. n. meeting t. m., the reduced stigma, 

 and the long first discoidal, the whole combination seeming to exclude it from the 

 modern genera. The upper apical corner of the second discoidal is obtuse, as in 

 Gorytes mystaceus, not acute as in G. (Hoplisus) quadrifusciatus. The second t. c. 

 is much less oblique than in either of the species just cited, being very nearly 

 vertical, and not at all parallel with the third t. c. 



