-436 Dr. A. S. Packard, Jr's Revision of the 



ferruginous, femora black, densely sericeous, yellow towards the tip, 

 especially the anterior pair, which are one-third yellow; anterior tibiae 

 yellow; two hinder pairs black, yellow at base ; tarsi black-brown, un- 

 guinal joints fuscous. Abdomen of the usual width and size, densely 

 •punctured, at base two yellow spots, and those on succeeding rings 

 geminate; hind edge of rings very narrowly reddish; tip with a dense 

 line of hirsuties, broad, unusually large, triangular, nearly as broad at 

 base as long, surface fiat, sides high. 



Length, .14 — .20 inch. 



% . Differs from the female in having whitish tarsi and the tip of 

 the abdomen being scarcely fuscous, while the front of the head is a 

 little narrower. 



Pennsylvania, New Jersey, Illinois, (Coll. Ent. Soc. Phil.). Mass., 

 August 15, Harr., (Coll. B. S. N. H.). Indiana, (Norton). 



The narrow front, the antennas which are testaceous beneath, the 

 laterally carinated prothorax, the broad, ovate, membranous expansion 

 on the meta-scutelluni, the broad bifurcate spine, and the broad, red, 

 abdominal tip, are good distinguishing marks for this species. In 

 many respects it closely approximates 0. analis Cress., from Cuba, and 

 represents that species in our Atlantic States. 



One minute specimen from Illinois is but .14 inch long, with the 

 abdominal fasciae obsolete. The individuals of this genus vary re- 

 markably in size. 



Section C. 

 Oxybelus interruptus, Cresson. 



0. interruptus, Cress., Proc. iv. p. 475. (1S65). 

 Colorado Territory, (Ridings, Coll. Ent. Soc. Phil.). 



Oxybelus parvus, Cresson. 



0. parvus, Cress., Proc. iv. p. 476. (1S65). 

 Colorado Territory, (Ridings, Coll. Ent. Soc. Phil.). 



Oxybelus mucronatus, n. sp. 



% . Front broad, densely and coarsely punctate, densely, silvery pu- 

 bescent, a prominent black protuberance between the antennae, which 

 are black, becoming brown on the outer half of flagellum. Mandibles 

 black at tip, ferruginous in the middle. Prothorax coarsely punctate 

 above, scarcely carinated, angular on the sides, with two remote yellow 

 spots, nearly contiguous to the yellow non-ocellated tubercle. Thorax 

 coarsely and densely punctured, not hairy; scutellum black; two 

 acutely, remote, thin expansions, not united, with two pairs of lateral, 

 curved, parallel, testaceous, membranous lines, going to the insertion 

 of the wings. On the base of the propodeum the parallel rugre diverge 





