COCKERELL: FOSSIL HYMENOPTERA FROM FLORISSANT. 49 



SPHECIDAB. 



Ammophila antiquella, sp. nov. 



Head and thorax black ; abdomen all light ; hind legs apparently light, with the 

 tarsi black, in strong contrast ; form slender. Length 12 mm. ; abdomen 7^ mm., 

 of which 3 mm. is petiole ; width of thorax between wings If mm., of head per- 

 haps a trifle less ; hind tibia 2f mm. ; scape rather stout, as usual in the genus, 

 metathorax transversely striated ; wings not preserved. Anteriorly to the trans- 

 versely striate area on thorax, some longitudinal striae can be seen. The petiole of 

 abdomen is two jointed, the first joint scarcely over one third the length of the sec- 

 ond ; the breadth of the apical part of the abdomen is 1J mm. 



Type. — No. 2020, Mus. Comp. Zool. Florissant, Col. (No. 5974, S. H. 

 Scudder Coll.). The specimen is poorly preserved, but as its relationships are 

 evident, it is described. 



YESPOIDEA. 

 SCOLIIDAE. 



I here use this family name in a rather broad sense, including the Myzinidae 

 and Tiphiidae of Ashmead. The two extinct genera here introduced are evi- 

 dently related to the Tiphiid series, though not without features suggestive of 

 the other groups. So far as I am able to judge, their affinity is closest with 

 the rare and apparently primitive genus Engycystis Fox, found in Texas and 

 Lower California. Curiously, however, a new genus from Australia is also re- 

 lated, and for purposes of comparison is herewith described. The following 

 table separates the four genera from each other : — 



Basal nervure entering subcostal at a distance from stigma much greater than 

 length of stigma Austrotiphia, gen. nov. 



Basal nervure entering subcostal at a distance from stigma less than length 

 of stigma 1 



1. T. m. strongly oblique ; stigma very narrow, not nearly filling the large 



stigmatic cell ; marginal cell not surpassing third s. m 



Lithotiphia, gen. nov. 

 T. m. slightly oblique 2 



2. Marginal cell surpassing third s. m., its apex rounded ; costal cell large. 



Geotiphia, gen. nov. 



Third s. m. surpassing marginal cell ; apex of marginal pointed, on costa ; 



costal cell small or rudimentary Engycystis Fox. 



In Engycystis, the ventral constriction between the first and second abdom- 

 inal segments is not nearly so marked as in Tiphia and Paratiphia, but in Aus- 

 trotiphia the constriction is still less evident, being hardly appreciable. One 

 would almost hesitate to place the latter genus in the Scoliids, were it not so 

 obviously a Tiphiid in every other feature. The otherwise different Australian 

 vol. l. —No. 2 4 



