COCKERELL: FOSSIL HYMENOPTERA FROM FLORISSANT. 51 



in Tiphia ( 9 ) they are conspicuously longer than broad. In Geotiphia and 

 Tiphia the claws are bifid ; in Austrotiphia they appear at first sight to be 

 simple, because the inner tooth is flattened, shortened, and directed somewhat 

 inwards. In Tiphia the middle coxae are very widely separated by a bilobed 

 projection of the mesosternum ; in Austrotiphia they are considerably closer 

 together, the bilobed projection, although present, being much smaller. In 

 Engycystis they are more as in Austrotiphia. In Tiphia the middle tibiae 

 have only one spur, in Austrotiphia and Engycystis (as in the Myzinids) 

 there are two. Tiphia has an open marginal cell and only two submarginals ; 

 Austrotiphia, Engycystis, Geotiphia, and Lithotiphia have a closed marginal 

 and three submarginals. 



Geotiphia, gen. nov. foxiana, sp. nov. 



Length about 11| mm. ; black, with light markings on abdomen ; femora black, 

 tibiae and tarsi light, probably red in life ; the abdominal markings, presumably 

 yellow in life, consist of a broad transverse spot or patch on the first segment, 

 rounded at sides and deeply emarginate posteriorly, a couple of transversely oval 

 spots on second segment, and a pair of smaller and rounder ones on third ; first 

 segment broad, broadly rounded in front ; width of abdomen about 3 mm. ; head 

 round, width about 2 mm.; middle joints of flagellum about 180 /x long and 

 225 broad ; middle tibia apparently short, broad (breadth about 300 /x), abruptly 

 truncate ; middle tarsi slender, first joint about 900 fx long, its outer edge straight 

 on first half and convex on second, third and fourth joints each about 225 /x 

 long, and quite slender; claw joint (excluding claws) about 300 /x long; claws 

 bifid, the two teeth about equally long ; hind femora stout but not at all subglobose, 

 about 1500 fx long ; hind tibia about as long, about 600 /x broad ; basal joint of hind 

 tarsus about 250 abroad. Outer apical edge of hind tibiae with very broad teeth, 

 witli points directed apicad, and long straight or nearly straight upper edges. Wings 

 with a large stigma (solid, filling stigmal cell), its breadth about 300 (this and all 

 following measurements in /x) ; costal cell very distinct, the costal and subcostal 

 nervures very heavy, and quite wide apart ; marginal cell complete, broadly 

 rounded at end, the actual apex not on costa, length of the cell 1500 [x, its tip sur- 

 passing apical point of third s. m. by about 100, although the distance from inser- 

 tion of third t. c. to apex of marginal is about 450 ; three submarginal cells, the first 

 1200 long ; second very broad, 450 long on marginal, and 000 on cubital nervure, 

 receiving the first r. n. exactly at the middle ; third s. m. 600 long on marginal, its 

 outer side strongly bulging ; first (upper) section of b. n. less than 300 long, bulg- 

 ing at its lower end, just before the origin of cubital nervure; second (lower) sec- 

 tion slightly over 300 long, meeting t. m., which is a little oblique ; first discoidal 

 1500 long ; second r. n. joining third s. m. not far from the middle. 



Type. — No. 2021, Mus. Comp. Zool. Florissant, Col. (No. 14,292. S. H. 

 Scudder Coll.). Named after Mr. W. J. Fox, in recognition of his work on 



Engycystis. 



