G. C. DAVIS. 205 



THIBETOIDKS n. g. 



Body closely and deejjly punctured. Head disc-shaped ; face 

 slightly inflated ; clypeus obsolete, but with a transverse groove 

 close above the mouth. Thorax compact, subspherical, a little longer 

 than broad ; upper margin of humerus raised very high ; scutellura 

 large, depressed, broadly oval, margined ; metathorax completely 

 areolated. Abdomen very broad, sessile ; all the segments beyond the 

 first with two transverse impressions, the deeper one constricts each 

 segment at the base, the broader one distinctly constricts about two- 

 thirds of the way to the apex ; basal segment strongly carinate on 

 disc. Wings with an areolet. 



ThibetuideM flosainoris n. sp. 



9 (?). — 6 ram. Black and strongly pilose, with mandibles, palpi, humeral line, 

 legs and apical third of all abdominal segments, except the first, which is nar- 

 rowly pale yellow ; coxpe, trochanters and hind tibije and tarsi more or less stained 

 with fuscous; autennse reddish brown, paler beneath; wings fuscous, nervures 

 and stigma brown, paler at base; areolet oblique, petiolate ; cubito-discoidal ner- 

 vure strongly arched ; basal and superior median areas broader than long; basal 

 segment of abdomen as broad at apex as the following segments, carried close to 

 metathorax, coarsely reticulate; second segment aciculately punctured at base, 

 apex of abdomen curved beneath, ovipositor not exserted. 



One specimen from Siskiyou County, California (type, coll. U. S. 

 Nat. Mus.). 



CATOCENTRUS Walsh. 



(Trans. St. Louis Acad, of Science, iii, 89, 1873.) 



Body closely and deeply punctured and pilose. Head disc .shaped, 

 face protuberant; clypeus transverse, protuberant; antennae mod- 

 erate. Thorax oval, gibbous, scutellum elevated, declivous behind ; 

 meta rugose, areolated. Abdominal segments 2-4 constricted at 

 base and impressed near the apex, making the apical margins promi- 

 nent ; first segment short, oval, prominent, scarcely narrowed at 

 base; ovipositor exserted, short. Wings with an areolet. Legs 

 short, rather slender ; posterior tarsi shorter than tibi?e ; tarsal claws 

 pectinate. 



C'atoceiitrus philauthoides Cress. (Tryphon), Trans. A. E. S. ii, 110; 

 Walsh, Tr. St. Louis Acad, iii, 90. 

 9 . — 8 mm. Black, with scape beneath, two spots on face above clypeus, ante- 

 rior humeral spots, scutellums, apical margins of all abdominal segments, broadest 

 on first, four anterior legs, except femora and coxfe, knees, and tibiaj, except apex 

 of hind legs, yellow; remainder of legs, mouth-parts and tegulae piceous; an- 

 tenna- dusky red ; wings with the anterior and apical portion yellowish fus- 

 cous, remainder subhyaline ; nervures and stigma reddish brown. 



Illinois (type, coll. Amer. Ent. Soc. ). 



TRANS. AM. ENT. SOC. XXIV. AUGUST. 1897. 



