HYMENOPTERAEUMENIDAE. EUMENES COLORADENSIS. 717 



74. PHILANTHUS VENTILABRIS. 

 PhUanthws ventildbris, FABE., Ent. Syst., suppl., 268. 



3 9 specimens; Colorado; Wm. H. Hance: New Mexico; Dr. H. C. 



Yarrow. 



75. CERCERIS FRONTATA. 



Cerceris frontatd, SAY, West. Quar. Eep., ii, 80. 



2 9 specimens; Colorado; Dr. H. C. Yarrow. 



76. CERCERIS BICORNUTA. 



Cerceris bicornuta, GUER., Icon. Reg. Auira., 443, 9 . 

 Cerceris Dufourii, GUER., Icon. Reg. Anim.. iii, 444, ,f . 

 Cerceris senator, CRESS., Proc. Eut. Soc. Phila., v, 116, <J . 



11 c? 9 specimens; Eastern Nevada; 1872: Colorado, New Mexico; 



Dr. H. C. Yarrow. 



77. CEEOEEIS SEXTA. 



Cerceris sexta, SAY, Bost. Jour. Nat. Hist., i, 382. 



2 9 specimens; Colorado; Wm. H. Hance. 



78. MASARIS VESPOIDES. 

 Masaris vespoides, CRESS., Proc. Ent. Soc. Phila., ii, 69. 



1 $ specimen; Colorado; 1873; Dr. J. T. Rothrock. 



79. ODYNERUS CAPRA. 

 Odynerus capra, SATiss., Rev. Mag. Zob'l., 1857, 273. 



2 <? 9 specimens; Eastern Nevada; 1872: New Mexico ; Dr. H. C. 

 Yarrow. 



80. EUMENES COLORADENSIS, sp. nov. 



9 . Black; rather densely clothed with a short, pale pubescence; apex 

 of clypeus, two oblique spots on upper margin (sometimes nearly confluent 

 with apical spot), clavate spot between antennae, dot behind summit of each 

 eye, scape beneath, anterior margin of prothorax, dot beneath wings, dot 

 on each side of scutellum, postscutellum, a round spot on each side of meta- 

 thorax at base, apex of femora, anterior pair beneath, all the tibiae, dot on 

 each side of first segment, of abdomen above, its narrow and wavy apical 

 margin, a transverse, rather oblique mark of variable size on each side of 

 second segment, its broad, apical margin (narrowed laterally, sometimes 

 deeply indented on anterior middle, sometimes entire, inclosing a black dot), 



