3G2 Dr. A. S. Packard, Jr's Revision of the 



broader. This 9 will probably be eventually found to be the 9 signi- 

 fer, differing likewise from T. pegasus 9 in its brighter yellow spots 

 and different arrangement of the abdominal fascia?. 



Mass. (Sanborn). 



In the following section (C) the head is shorter than in the preced- 

 ing species, the clypeus rather narrower, raised in the middle, and the 

 13-jointed antenna? are cylindrical throughout, the 2nd joint of the fla- 

 gellum long and slender, dilated, as long as the mandibles, which are 

 narrow, longer, tooth somewhat pointed ; palpi short, thick, joints 

 hardly dilated, unusually hirsute, rather broad. The thorax is short, 

 globose, the tubercle not colored yellow, prothorax rather broader than 

 in the preceding sections. The fore tibia? are provided with broad 

 triangular expansions, much shorter than broad, or nearly simple, first 

 joint of tarsus broad, as long as the remaining ones, tip a little produced, 

 2nd, 3rd and 4th short and very broad, of equal length, hind tibia? 

 more dilated than in preceding species, the propodeum is roughly sculp- 

 tured ; the outer sub-median recurrent is more oblique and angulated in 

 the lower three-fourths than in the preceding sections. 



The abdomen is much longer than the head and thorax together, 

 much narrower than the thorax, flattened beneath, not arcuate as usual; 

 basal ring twice as long as wide, thickened and convex above, tip rather 

 triangular than spatulate. 



Thyreopus pegasus. Pack. 



Crab ro pegasus, Harr. Cat. Ins. Mass. p. 6S. (1835). 



% . Body slender, black; head finely but distinctly punctured; or- 

 bits and clypeus silvery; mandibles brown, testaceous at tip, at base 

 yellow; two basal joints of antenna? yellow, remainder piceous black, 

 with a brownish spot on the upper side near the base. Thorax punc- 

 tured like the head, prothorax yellow, interrupted mesially ; tubercle 

 vellow ; te"ula? testaceous, concolorous with the uervures of wing: two 

 yellow dots on meso-scutellum, sometimes obsolete and black. Surface 

 of propodeum coarsely rugose, with high transverse and longitudinal 

 ridges; enclosure not so distinct as usual, mesial furrow, and ruga? 

 more distinct posteriorly; on each side of the mesial line a deep fur- 

 row ; sides straight, bordered by straight longitudinal ridges ; between 

 these two furrows, a long, narrow triangular depression. Fore femora 

 dilated, brown, with a longitudinal yellow stripe on the terminal half; 

 on the yellow tibia? a triangular vexhillum, broadly angulated on the 

 basal half of inner margin; surface covered with sinuate alternate 

 light and dark lines, ofteu interrupted into spots most thick-set on the 

 outer half of the vexhillum ; middle femora brown, with a yellow 



