1G8 BYMENOPTERA OP AMERICA. [PART 1. 



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

 ing of brown ferruginous about, the nervares. 



%. Clypeus lengthened, bidentate; the teeth permitting between 

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

 a line on the scape of the antenna?, white. Extremity of the 

 antenna' 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. 



l'i//\ Scutellum bordered with whitish. 



/,'< ss. a. diff. — This species is very well characterized by its 

 white ornaments, and it has the appearance of the European 

 species (if the subgenus Epipona. One might easily err in 

 ranging it with this group in spite of the anteriorly truncated 



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



insects. See the affinities of the 0. Oatskilli. 



//(ih. 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 9 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? 



1JJ. A. ('atsliillensss Sauss. — Niger, punctatus, crassus ; 0. albo- 

 phalerato statura et 0. campestri pictura similis; corpore flavo-pictd; 

 metanoti foveola acute marginata, frequenter utrinque macula flava ; 

 scutellorum limbo interrupto, flavo; antennarum scapo flavo-lhieato. 



nerus Catslcilli Sauss. Vespides, I, 136.' 

 Odi/n. Catskillensis Sauss. 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 be regretted, 

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

 into account at all. 



