ART. 4. GENERA CLISTOPYGA AND SCHIZOPYGA CUSHMAN. 7 



Clypeus separated from face : mandibles bidentate, without a flange 



internally ; ovipositor distinctly esserted B. 



B. Eyes parallel or nearly, face not convergent below and wider tlian long ; 

 clypeus truncate and flattened or impressed at apex; mandibles with 

 teeth subequal ; ovipositor curved upward, weakly compressed or sub- 

 cylindrical ; hypopygium reaching nearly or quite to apex of abdomen. 



Clistopyga Gravenhorst. 

 Eyes convergent below, face as long as wide at clypeal foveae ; clypeus 



either rounded or truncate at apex, but never impressed ; ovipositor 



straight, compressed ; hypopygium retracted 1. 



1. For remainder of key see Proceedings of the United States National Museum, 

 vol. 58, 1920, pp. 16-17. 



Genus SCHIZOPYGA Gravenhorst. 



Schizopyga Gbavenhoest, Ichn. Eur., vol. 3, 1S29, p. 12-5. Genotype — 

 ScMzopyga podagrica Gravenhorst. 



Very anomalous in its head characters, this genus agrees in most 

 particulars T\^ith the more normal forms of the Polj'sphinctini, The 

 form of the ovipositor, the tuberculate tergites, the deep and com- 

 plete notauli, the swollen femora and apical tarsal joints, the dentate 

 clavv^s in the female, and the venation differ very little from those 

 of the typical Pohvsphinctine. 



The very peculiar head has the face long, flat, elevated above the 

 level of the eye-margins, and completely fused with the clypeus, 

 which is truncately rounded at apex. The mandibles are as de- 

 scribed above, while the lobe, or mala, of maxilla is very large, almost 

 quadrate, and when at rest lies beneath and against the mandibles 

 meeting its fellow along the median line. The calcaria are very 

 stout with a small apical spine-like process. 



SCHIZOPYGA FRIGIDA Cresson. 



Schizopyga frigida Cresson, Trans. Amer. Ent. Soc, vol. 3, 1870, p. 159. 

 Type.— Cat. No. 1468, Acad. Nat. Sci. Phila. 



Discussion based on a female homotjq^e (Rohwer) from Mount 

 Washington, New Hampshire, and another female from Ames, Iowa. 

 The Mount Washington specimen has the hind tibiae and tarsi more 

 extensively black than in the Iowa specimen and the coxae are 

 piceous. Cresson's type is from Hudson Bay Territory. 



Genus CLISTOPYGA Gravenhorst. 



Clistopyga Gravenhokst, Ichn. Europ., vol. 3, 1829, p. 132. Genotype. — 

 IcJmeiimon inciiator Fabricius. 



Readily distinguished from the other genera of the tribe by the 

 parallel and practically nonemarginate eyes, the short hind tibiae, 

 which never exceed the femora very greatly in length, and, in the 

 female, the large hypopygium and upcurved ovipositor. 



Ashmead's translation of Foerster's character for separating this 

 genus from Polysfhincta^ etc., conveys exactly the opposite idea from 

 that intended by Foerster. The ventral borders of the terminal 



