WALSH DESCRIPTIONS OF N. AM. HYMENOPTERA. 95 



hind coxa, and more or less of the lower face of the mesosternum, are all 

 rufous. 6. The abdomen is in tf \, in $ £ longer than the head and tho- 

 rax together. Joint 1 is only J wider behind than before, and its 2 carinas 

 in $, and sometimes in $, only extend half way to the tip. 7. The legs 

 are rufous, but the 4 front tibia? are internally whitish, and the 4 front 

 tarsi entirely so. In the hind legs the femora are lightly tipped with 

 black, the knees whitish, the terminal {-\ of the tibiae black, and the tarsi 

 white with the extreme tips of the joints black. 8. The wings are slightly 

 tinged with dusky. Length o* -27; o" -30-.3I inch. Front wing d 1 .23 ; $ 

 .25 inch. 



One % , two ?. Distinct from pleuralis % , Cress., dorsalis % , 

 Cress., and pallipes % , Cress., by their "broad white orbits" be- 

 ing reduced to a spot on the vertex, and by other characters. 



ExoChllS aiinillicrilS, n. sp. — d\ — Differs from Icevis $ only as follows : 

 1. The face projects beyond the eyes scarcely § of their shorter diameter, 

 and the clypeus is punctured like the face. 2. The face, clypeus, mandi- 

 bles except their teeth, a small triangular spot on the vertex next the eye, 

 and a very narrow orbit reaching just beyond the antennae, are all yel- 

 lowish-white. 3. The first joint of the scapus is yellowish beneath; joint 

 1 of the flagellum is 2k times as long as wide, the following joints about £ 

 longer than wide, and the tips are not convolute. 4. The carinate areas 

 of the metathorax are all complete as in albifrons. 5. The tegulae, a short 

 capillary line under the front wing, a large triangular spot adjoining the 

 tegula in front, a transverse line at the tip of the scutel and another be- 

 hind it, the entire lower face of the mesosternum, and a large spot before 

 each anterior coxa, are all yellowish-white. No rufous markings. 6. The 

 abdomen is \ longer than the head and thorax together. Joint 1 is only 

 \ wider behind than before, and its 2 carinae reach \ of the way to its tip. 

 7. The legs are rufous, but in the 4 front legs the coxa, both trochanters, 

 the knees, the inner face of the tibiae, and the entire tarsi, are whitish. In 

 the hind legs, the lower face of the coxa and both trochanters are whitish, 

 the first \ of the tibiae and also their extreme tips are black and the second 

 ^whitish; and the tarsi are whitish with the extreme tips of the joints 

 black. Length 0* -23 inch. Front wing o" -i8 inch. 



One % ; 2 unknown to me. Distinct from albifrons % by the 

 whitish sternum, coxae and trochanters, the whitish annulus on the 

 hind tibiae, and the black hind knees ; and from pleuralis, Cress., 

 dorsalis, Cress., and pallipes, Cress., by its having no "broad 

 white orbits." I am not sure of the sex of the above, but infer it 

 to be % from the spot on the vertex being similar to that of % 

 (not ?) albifrons. 



ExOChllS Jltriceps, n. sp. — o"- — Pale rufous. Head black, opaque, with 

 confluently fine, shallow punctures, obsolete on the vertex which is polished 

 and subobsolete on the clypeus. Face extending beyond the line of the 



