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



slight ridge leading from it towards the mesial line, surface of the me- 

 so-scutum puncto-lineated, where in T. eoloradensis it is simply punc- 

 tured ; scutellum punctured; post-scutellum minutely puncto-lineated 

 longitudinally. Propodeum much more coarsely rugose than in the 

 Colorado species, the mesial femora expanding into a broad diamond- 

 shaped area much nearer the base of the segment than in the Colorado 

 species. Wings much the same, but the costal nervures are much 

 blacker than iu the two other species. Fore tibiae expanded into a 

 long acute mucronate shield, which is much longer and narrower and 

 less broadly leaf-like than in T. eoloradensis. It also differs in form from 

 that of T. cribrellifer in being more acute at tip, and having a broad 

 sub-acute lobe on the anterior edge. It is not covered with dots, but 

 with three broad, black, parallel, longitudinal stripes, of which the 

 outer is one-half as long as the inner; also on the inner black base each 

 of the three straight broad lines go to the inner edge; tarsi much as in T. 

 cribrellifer ; middle femora with a black line, above yellow; hind femo- 

 ra yellow; middle tibine yellow, with a black line within; hind tibite 

 broad towards tip, black within, grooved beneath, on the outer edge a 

 row of spinules; middle tarsi yellow; hind tarsi fuscous beyond base 

 of first joint which is yellow, being much paler than in the two other 

 species named above. 



Abdomen as described in T. cribrellifer, being intermediate in size 

 between it and T. eoloradensis, but the basal pair of fascias are more 

 sinuate and slenderer, the third and fourth pairs are entire as in T. 

 eoloradensis, not being excavated on the front edge as in T. cribrellifer; 

 fifth pair united into a continuous band, entire; sixth pair separate 

 again. 



Length of body, .86 inch. 



Connecticut, (Norton). Mass., (Harris' Coll.). Brunswick, Me., 

 (Packard). 



The broad, long, acute, mucronate, shield-like expansion of the fore 

 tibiae, with black, straight stripes at base, and on the outer edge, will 

 distinguish it from C. eoloradensis, and on the other hand, its middle 

 femora lined with black above, and beneath yellow, will readily distin- 

 guish it from T. cribrellifer. It agrees closely iu these characters with 

 the Colorado species, as also in its abdominal fasciae and antennae, dif- 

 fering from both, however, in the sculpturing of the propodeum. 



Thyreopus eoloradensis, n. sp. 



Crabro latijies, Cresson, Proe. Ent. Soe. Vol. iv, p. 477. (1865). 

 % . Body more elongated and slender than in T. latipes ; head a 

 little shorter, and narrowing more rapidly behind the eyes; surface 



