286 • [September 



Section 2. — Areolet wanting. 



4. Exochus laevis, n. sp. 



Black, polislied, legs reddish-brown; wings hyaline. 



% 9 . — Black, smooth and polished, thinly clothed with a short, ap- 

 pressed, pale pubescence; palpi piceous; antennae blackish, three-fourths 

 the length of the body, thickened at base ; tegulae pale testaceous ; 

 metathorax polished, truncate behind, the elevated lines distinct, the 

 central area elongate. Wings hyaline; nervures and stigma black. 

 Abdomen highly polished, slightly narrowed at base, the first segment 

 canaliculate, the remaining segments equilateral and subcylindric ; ovi- 

 positor of the female rufous, scarcely exserted. Length 31 lines; ex- 

 panse of wings 5 lines. 



Hah. — California $ (Dr. Horn) ; Illinois % (Dr. Lewis). 



I see none but sexual differences between the specimen from Cali- 

 fornia and those from Illinois. 



5. Exochus pleuralis, n. sp. 



Black; face, orbits, tegulfe, pectus, pleura, most of the legs and a triangular 

 spot on each side of the 2nd, 3rd and 4t]i abdominal segments, yellowish ; 

 wings hyaline. 



Male. — Black, polished, slightly pubescent ; the face, mouth, and 

 the frontal orbits very broad above and beneath the eyes, yellow ; an- 

 tennge three-fourths the length of the body, brown-black above, rufo- 

 piceous beneath. Thorax : mesothorax black; tegulae, pectus and pleura, 

 yellowish, the latter slightly stained with pale rufous; scutellum black, 

 pale at tip; metathorax black above, its extreme sides reddish-yellow, 

 polished, the elevated lines tolerably well defined, the central area large 

 and quadrate. Wings hyaline, the nervures and stigma blackish, the 

 former pale at base. Legs pale yellowish, tlie posterior femora pale 

 rufous, and the extreme tips of their tibiae and tarsi blackish. Abdo- 

 men black, polished, subcylindric, slightly narrowed at base ; the first 

 segment with two longitudinal carinas on the disk and one on each late- 

 ral margin ; on each side of the 2ud, 3rd and 4th segments at tip a 

 rather large, triangular, pale testaceous spot; beneath, stained with 

 yellowish. Length 2^ lines; expanse of wings 4 lines. 



Hah. — Illinois. Dr. Samuel Lewis. 



6. Exochus dorsalis, n. sp. 



Black; face, orbits, line before the wings, pleura and most of legs, yellowish: 

 mesothorax rufous ; wings hyaline. 



Male. — Head black, the face, frontal orbits broad above and beneath 



