350 BULLETIN UNITED STATES GEOLOGICAL SURVEY. [VolY. 



Wings "wliite-liyaline, nervures testaceous, stigma black. First segment 

 of the abdomen squarely truncate, the truncation bounded by a carina 

 and " suture," the base of the second segment with a transverse space, 

 narrowed laterally, marked oif by a slight carina. 



Prom the ? of the Mexican ParatipJda Smnichrasti {Epomidiopteron 

 Sumichrasti Sichel, Sauss. & Sich. Cat. Spec. Gen. Scolia, p. 267), this 

 species difiers in the color of the wings and pubescence, in that species 

 the wings bemg tinted with ferruginous and the ijubescence with red. 



These 9 specimens differ from the description of the Californian ^ 

 alMlabris (the only sex described hitherto) in the icMte-hj aline wings, in 

 the nervures and costa not being exactly " rufous," and in the clypeus 

 not being white. But the white clypeus is a male sexual character of 

 the genus ; in P. Sumichrasti the color of the nervures varies, and in all 

 the specimens of albilabris $ which I have seen the nervures and costa 

 are black. Tet in specimens of albilabris $ the wings have not the 

 white tinge which is apparent in these ? specimens. 



In alhilahris $ the metathorax has two small rectangular enclosures 

 on the disk, and a transverse row of similar reticulations on the obli- 

 quely deflexed posterior border just above the carina, which limits the 

 posterior truncation. The base of the mandibles is sometimes white. 

 It diifers from the $ of Sumichrasti in the posterior border of the first 

 abdominal segment oiot extending over the second segment in the form 

 of an angle so as to give the appearance of a " subcordiform suture." 



The genus Paratiphia (Sichel in Sauss. & Sichel, Cat. Spec. Scolia, p. 

 260) differs from Epomidiopteron in the distinct stigma of the 2 and the 

 large stigma of the $ , in the second submarginal cell being as large as 

 the first, and in both the first and second receiving the recurrent ner- 

 vures beyond the middle, in the uneularged tegulte, in the triangular 

 form of the enclosure on the metathorax of the 5 , in the transverse 

 carina on the sessile first segment of the abdomen, and in the second 

 ventral segment not being tuberculate. It agrees with Tiphia in the 

 distinct stigma, large second submarginal cell, and unenlarged tegulge, 

 but differs in the other characters in which it differs from Epomidiop- 

 teron, and also differs from Tiphia in the partial division of the first 

 submarginal cell into two by an abbreviated vein descending from the 

 marginal cell. In the i)resence of this vein it agTees with Epomidiop- 

 teron, but I find also a rudiment of the vein in some specimens of Tiphia 

 inornata Say. The three genera agree in having the marginal ceU open 

 in the 2 and closed in the (? . 



In Paratiphia the eyes are slightly sinuate within. The <? differs 

 from the 2 in the clypeus being white, in the mandibles being tridentate, 

 the two inner teeth minute, in the sculpture of the metathorax, and in 

 the dorsal valve having a median carina. 



5. Scolia lecontei Cress., 9 



6. Scolia octo-maculata Say, 5 . 



