168 IIY.MEXOPTERA OF AMERICA. [PART 1 



rent, with the radius and the stigma brown, except a little wash- 

 ing of brown ferruginous about the nervures. 



%. Clypeus lengthened, bidentate; the teeth permitting between 

 them a narrow emargination. Mandibles, labram, clypeus, and 

 a line on the scape of the antennae, white. Extremity of the 

 antennae beneath and the hook, ferruginous. Angles of the 

 metathorax dentiform ; marginal ridges of the metathoracic plate 

 very trenchant, forming on each side a spiniform tooth ; scutellum 

 parted by a groove ; post-scutel rugose, offering on the summit 

 of its posterior trench a sort of interrupted rugose ridge. Knees, 

 tibiae; tarsi, and often the femora, whitish. 



Var. Scutellum bordered with whitish. 



Bess. a. cliff. — This species is very well characterized by its 

 white ornaments, and it has the appearance of. the European 

 species of the subgenus Epipona. One might easily err in 

 ranging* it with this group in spite of the anteriorly truncated 

 abdomen. The clypeus (%) in particular is cut exactly as with 

 these insects. See the affinities of the 0. Catskilli. 



Hob. North America. I took this Odynerus in abundance in 

 the environs of New York in the month of April, but I met none 

 except the males. I finally received 12 ? from Connecticut, 

 Illinois, and Pennsylvania. 



Observation. — We possess one individual 9, having the form 

 sensibly more stubbed, which has the clypeus white, with a black 

 spot and the scutellum almost entirely white ; the borders of the 

 segments quite wide. (Illinois.) Is it a simple variety? 



13. A. Catsltillensis Satxss. — Niger, punctatus, crassus; 0. alio- 

 phalerato statura et 0. cawpestri pictura similis; corpore flavo-picto ; 

 metanoti foveola acute marginata, frequenter utrinque macula flava ; 

 sentellorum limbo interrupto, flavo; antennarnui scapo fiavo-lineato. 



O'li/nerus Catskilli Sauss. Vespides, I, 126. ' 

 0<!<jn. Catsli/lensis Sadss. Et. Vespid., Ill, 204. 



9- Total length, 11.5 mm. ; wing, 9.5 mm. 

 % . Total length, 9.5 mm. ; wing, 8 mm. 



1 The fig. 8, pi. xvi, which is named as representing this species in the 

 work cited, does not represent it at all. It is a lapsus to he regretted, 

 without considering that the figure is very bad. One should not take it 

 into account at all. 



