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



tory will be eagerly sought for in endeavoring to establish its true posi- 

 tion in nature. 



Its unusually deeply indented eyes and the narrowness of the head 

 in front of the antennae, and its remarkably long pedicellate abdomen, 

 wherein it is mimicked by the % of Pelecinus, are the most important 

 subfamily characters. 



Subfamily Trypoxylonin;E.* 



TKYPOXYLON, Latr. 



Trypo.rylitcs St. Fargeau, Nat. Hist. Ins. Hym. Suite a Buffon. (1845). 

 Trypoxylon, Latr. Proa. Cav. Ins. (1796). 

 Apius Jurine, Hym. 140. (1807). 



9 . Head half as long as broad, a little convex in front, where it is 

 much narrower than usual, about half as broad as long. The eyes are 

 large, approaching each other on the vertex much nearer than usual, 

 triangularly indented nearer the middle than usual. The ocelli are 

 arranged in an equilateral triangle. The epicranium is produced 

 acutely between the antennae, which are nearer together than usual. 

 The clypeus is equilateral, being distinctly so, and the two upper sides 

 are straight, being acutely pointed above, while the base is convex, 

 and the surface is raised in the middle. Antennas of the usual length, 

 hardly thickened in the middle ; there is a greater equality in the three 

 basal joints than usual, the 1st and 3d being very large, while the 2d is but 

 a third longer than the 3d, which is flattened spherical. The thorax is 

 cylindrical oval, narrowing more at each extremity than usual. The 

 prothorax is more separate than usual from the succeeding ring, pos- 

 teriorly, being short convex above and on the sides, and narrower than 

 the rneso-thorax ; meso-scutum square, not as long as broad; scutellum 

 oblong, twice as broad as long; meta-scutellum short, a third as long 

 as preceding piece. The enclosure of the propodeum is more triangu- 

 lar than usual, very small, eqnilaterally triangular, and from it the sides 

 rounds rapidly down behind and laterally. The coxae are flattened 

 conical, those of meso- and meta-thorax very unequal in size. The 

 trochanters are long, legs not very stout, smooth ; femora swelled, tibiae 

 very broad towards the tip, spurs large. Fore tarsal joints rather 

 broad; hind tarsal joints long cylindrical, smooth, not dilated. 



Primaries : the 2d and 3d sub-costal, and 2d median spaces are 

 obsolete; pterostigma small, outer costal triangular, lanceolate acute 



* The subfamily ending ina3 is substituted for St. Fargeau's family ending, 

 as be considered the group to be equivalent to the Crabronidse. 



