1864.] 311 



thorax, ovate, flattened, highly polished, bright rufous, the extreuie 

 base sometimes blackish and the extreme apex sometimes slightly yel- 

 lowish and pubescent ; basal segment squarely dilated at tip, forming a 

 slight angle on each side about the middle, petiole short and stout ; ovi- 

 positor about half the length of the abdomen, rufous. Length 2 J — 3-] 

 lines; expanse of wings 4^ — 5J lines. 



^«/;.— Penn., Del. (Dr. >yilson); Illinois (Dr. Lewis). Ten 9 spe- 

 cimens. 



This is our most common species; it varies much in size, and the ru- 

 fous color is sometimes very pale, the antennje are always black at tips 

 and in some specimens there is a more or less pale annulus, the rufous 

 color at base gi-adually shading into pale yellowish towards the middle. 



t). Phygadeuon subfascus. n. sp. 



Black, shining: base of antennae, legs and abdomen, except base, dark rii- 

 I'ous; wings subhyaline ; metathorax excavated behind ; ovipositor very short. 



Female. — Black, polished ; head transversely subquadrate, entirely 

 black ; palpi pale ; antennge half the length of the body, stout, rufous, 

 gradually shading into fuscous towards the apex. Thorax minutely 

 punctured; mesothorax somewhat flattened, polished and feebly and 

 sparsely punctured ; scutellum triangular, slightly depressed, with a 

 transverse, rather deep excavation in front; metathorax finely sculp- 

 tured, a large shining space on each side at base, the elevated lines dis- 

 tinct, the central area moderate, semicircular, and immediately behind 

 it a deep, abrupt excavation, the tubercle on each side scarcely visible. 

 Wings hyaline, fiintly tinged with pale fuscous ; uervures and stigma 

 pale fuscous, paler at base ; areolet 5-angular. Legs, including the 

 coxae, rufous, the posterior tibiae and tarsi dusky. Abdomen as long- 

 as the head and thorax, ovate, flattened, polished, dark rufous or rufo- 

 fuscoiis; basal segment black, gradually dilated towards the tip, cari- 

 nated laterally and with a shallow fovea on the disk, petiole rather short 

 and stout; ovipositor subexserted. Length 3 J lines; expanse of wings 

 5 J lines. 



Hah. — Illinois. Dr. Samuel Lewis. 



7. Phygadeuon mandibulaiis, n. sj). 



Black: mandibles, ba-se of antennae, tegulae, legs and abdomen, rufous: wings 

 subhyaline: mandibles very large and pubescent. 



Female. — Black, shining, slightly pubescent, more dense on the face; 



