56 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



two light lines or narrow bars on mesothorax, not reaching the anterior ov 



posterior margins, and 5986 also shows a narrow light anterolateral margin, 



probably really on the prothorax, as is common in living forms. The antennae 



appear to be as in Vespa. Nos. 2031, 2032, M. C. Z. (Nos. 18,382 and 7868, 



S. H. Scudder Coll.), are two isolated anterior wings of Palaeovespa. They 



exhibit a good deal of difference in small details, but are, I think, certainly 



referable to P. gillettei. From them it is possible to ascertain several characters 



not clearly discernible in the type. Both show a dark cloud in the apical 



part of the costal cell, such as occurs in modern Vespa. The junction of b. n. 



to subcostal, which in the type is some 450 /i from base of stigma, is only about 



300 from it in No. 18,362, and 345 in No. 8981, but it is difficult to say exactly 



■where the basal n. leaves off, and where the stigma begins, the fusion being 



gradual. The size is throughout too small for P. scudderi. The following 



measurements are in p. : 



Length of second s. m. Length of third s, m. 



on marginal. on marginal. 



P. scudderi, Type No. 2027, M. C. Z. 450 825 



No. 2032, M. C. Z. 345 675 



No. 2031, M. C. Z. 225 675 



First r. n. from First r. n. (on Second r. n. 



beginning of cubital n.) from end of 



second s. m. from second r. n. second s. m. 



P. scudderi, Type No. 2027, M. C .Z. 225 665 ? 375 ? 



P. gillettei, Type No. 2028, M. C. Z. ? ? 225 ? 



No. 2032, M. C. Z. 150 535 375 



No. 2031, M. C. Z. 150 375 300 



Vespa (modern) 195 240 750 



P. gillettei is named after Professor C. P. Gillette, in recognition of his 

 work on the entomology of Colorado. 



EUMENIDAE. 



Odynerus palaeophilus, sp. nov. 



$ Rather slender, length 9 mm., anterior wing 8 mm. ; black, the wings dusky ; 

 first abdominal segment in lateral profile (/. e. seen from the side) presenting a 

 curve which is uniform, not abruptly bent at any point, and is equal to about 

 a quarter of a circle ; abdomen broad and convex, with the apical part separated, 

 doubtless originally marked off by a suture, as in some living forms ; marginal 

 cell very broad, in the form of an elongated triangle, the apex downwards ; apex 

 of first discoidal only moderately oblique (much less so than in a modern species 

 compared) ; second sultinari^nn il cell narrowed almost to a point above, its length 

 on marginal being only 00^, while its length on cubital nervure is 655 fi ; width of 

 marginal cell, 600 fi ; width of third s. m. on marginal, 525 /x. It would be easy to 

 misinterpret the venation of this insect (as also of the species of Palaeovespa), 

 owing to the folding; but it is easily understood when compared with modern 



