310 [September 



piceous, palpi pale ; antennae short and stout, involute, rufous, with a 

 white sericeous pile. Thorax polished, without distinct punctures; 

 mesothorax flattened, with a few subobsolete punctures on the disk ; 

 scutellum flat, with two deep, subtransverse excavations in front ; me- 

 tathorax almost smooth, shining, the elevated lines distinct, the central 

 area large and semicircular, and immediately behind it a very deep, 

 abrupt, arcuated excavation, the carina bounding it in front ends each 

 side in an obtuse flattened tubercle; tegulae rufous. Wings subhyaline, 

 slightly iridescent, the anterior pair tinged with fuscous, the posterior 

 pair clearer ; nervures fuscous, paler at base, stigma black ; areolet 

 subquadrate, moderate. Legs thickened, rufous, clothed with a short 

 whitish pile ; most of the posterior coxae and their femora, as well as 

 the middle femora slightly, more or less blackish. Abdomen about as 

 long as the head and thorax, flattened, highly polished, subovate, dark 

 rufous, sides blackish ; first segment robust, arcuated, broadly dilated 

 at tip, with a slight tubercle on each side of the posterior third, petiole 

 short and .stout; apical segments slightly incurved ; ovipositor short, 

 rufous. Length 3i lines; expanse of wings 5 lines. 

 Hab. — Rocky Mountains, Colorado Territory. 



5. Phygadeuon vulgaris, u. sp. 



Black; basal twu-thirds of antennae, legs and abdomen, rufous ; wings sub- 

 hyaline ; metathorax deeply excavated behind. 



Female. — Black, shining, slightly pubescent; head sub((uadrate. 

 mandibles dull rufous, palpi pale yellowish ; antennae short and stout, 

 basal two-thirds pale rufous, often paler towards the middle, apical third 

 piceous, basal joint robust, elongate. Thorax polished, densely and 

 minutely punctured; mesothorax somewhat flattened; scutellum flat, 

 polished, sparsely punctured, with two deep, slightly transverse exca- 

 vations in front; metathorax finely rugose, with a polished space on 

 each side at base enclosed by elevated lines, which are tolerably dis- 

 tinct, the central area rather large, transversely and irregularly sub- 

 ([uadrate, immediately behind it a very deep, abrupt, arcuated excava- 

 tion, and on each side of it a prominent, flattened, obtuse tubercle ; 

 tegulfe rufous. Wings hyaline, slightly but uniformly tinged with 

 fuscous, faintly iridescent; nervures and stigma fuscous; areolet mode- 

 rate. Legs, with their coxje, pale rufous, posterior pair darker and 

 often more or less dusky. Abdomen about as long as the head and 



