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



Trypoxylon clavatum, Bay. 



T. fuscipc?mis, Beauv., Ins. Afrique et en Amer. Ilym. pi. iii, fig. 2, p. 115. 

 (1805). 



not T. fuscipennis, Fabr., Bp. Syst. Piez. 181, 3. (1805). 

 T. clavatus, Harris, Cat. Ins. Mass. p. G8. (1835). 



Say, Bost. Jour. Nat. Hist. vol. i, p. 374. (1837). 

 T. clavatum, Smith, Cat. Hym. Br. Mus. iv, p. 381. (1856). 



9. Head as usual, front very thickly silvery pubescent; antenna; 

 little more clavate towards the tip than in the preceding species, black ; 

 mandibles black ; thorax densely pubescent ; propodeum with a large, 

 distinct, triangular area ; mesial furrow very distinct, with slight li- 

 near rugae, posteriorly at the apex of the enclosure an area covered 

 with transverse parallel curvilinear lines; very densely silvery pubes- 

 cent on the sides of the propodeum ; wings differ from those of T. po- 

 litum in being clear, slightly clouded externally; pterostigma much 

 more distinct; outer side of 1st sub-costal cell bent in the middle, 

 where in T. politum it is slightly curved, while the outer side of the 

 2d sub-median cell is more obliquely and slightly curved than in T. 

 politum, where it is suddenly bent. Fore legs black, tarsi slightly 

 paler ; middle legs black, tarsi with tips of joints 1 — 1 fuscous, un- 

 guinal joint black ; hind legs black, tarsi pale testaceous, uiiguinal joint 

 entirely black, while in T. politum it is white, and only the ungues 

 themselves are black. Abdomen as in the preceding species, but a 

 little slenderer. 



Length of body, .54 inch. 



In this species there is a good deal of variation in the amount of 

 striation of the enclosure of the propodeum, some specimens having it 

 smooth, polished, and minutely punctured, and at the apex transversely 

 minutely striated; while in others the base of the enclosure is longitu- 

 dinally striated, and with the cross-line very much larger than in 

 others, much as described in T. tridentatum. 



Illinois, (Coll. Ent. Soc. Phil.). North Carolina, (Hentz, Harris, 



Coll. B. S. N. H.) West Farms, N. Y., (Angus). 



Trypoxylon excavatum, Smith. 



T. excavatum, Smith, Cat. Hym. B. M. iv. p. 380. (1856.) 



This species is a little smaller than T. clavatum; the front is nar- 

 rower, not so silvery pubescent ; the outer edge of the wing and the 

 costa beyond the pterostigma is more clouded; tarsi uniformly black; 

 joints very narrowly tipped with testaceous, sericeous; propodeum 

 with a semielliptical area, with slightly raised sides, and a dense ob 

 lique line of silvery pubescence on each side. 



Cuba, (Coll. Ent. Soc. Phil.). 



