AMERICAN HYMENOPTERA. 447 



first cubital cellule, a small cloud below the first transverse cubital 

 nervure, and the basal half of the hind wings are also hyaline ; stigma 

 pale ochraceous, its basal fourth black. Area on base of second ab- 

 dominal segment reaching to the base of the apical fourth ; it is smooth, 

 has a round tubercle in the middle of the base and becomes gradually 

 narrowed to the apex ; the narrowed apical part is bordered by wide, 

 deep furrows. Suturiform articulation wide, the central part finely, 

 closely striated ; the lateral apical branch is roundly curved ; there is 

 a narrow furrow on the base of the fourth segment, and a less distinct 

 one on the base of the fifth. Tegulae black. Face and metathorax 

 densely covered with long white pubescence. Base of mandibles rufous, 

 o". Length 9 mm. 



Mendoza, February. 



DORYCTIN/E. 



33. Liobracon ruficornis sp. n. 



Black, the flagellum of antennae and palpi dark red, the pronotum, 

 the middle lobe of mesonotum, the centre between it and thescutellum, 

 metathorax, abdomen, and hind legs, bright red ; the apex of the 

 four anterior femora, the tibia? and tarsi rufo-testaceous ; wings fusc- 

 ous, paler at the base, the nervures black, the stigma pale ochraceous, 

 black at the apex, the base of the radial cellule narrowly and the first 

 cubital cellule, except behind, hyaline ; the third abscissa of radius 

 almost twice the length of the basal two united ; the first abscissa of 

 radius curved forward, the second rounded backwards ; the recurrent 

 nervure received in the apex of the first cubital cellule ; the transverse 

 median nervure shortly beyond and the transverse basal and very 

 obliquely sloped. The basal radian cellule in the hind wings is about 

 one-fourth of the length of the apical. Head, thorax and legs covered 

 with longish clear white hair ; the apical abdominal segments bear 

 shorter white hair. 9 . Length 10 mm., terebra 5 mm. 



Face closely, somewhat strongly transversely striated, almost reticu- 

 lated above ; the top in the middle strongly, but not closely punctured. 

 Front and vertex smooth and shining; the front not much depressed. 

 Ocellar region distinctly separated and raised. Thorax and abdomen 

 smooth and shining. Pronotum nearly as long as it is wide at the 

 apex. Middle lobe of mesonotum large, clearly separated, roundly 

 convex. Parapsidal furrows smooth. Scutellar depression large, deep, 

 its sides rounded, the centre with a stout keel. Middle of metanotum 

 with a shallow furrow, stoutly keeled down the middle. First ab- 

 dominal segment wider than long ; the second is shorter, has a narrow 

 furrow down the middle and a wider, deeper, oblique one on either 

 side ; its apex is bounded by a smooth, roundly curved furrow ; there 

 is a narrow, shallow curved furrow on the base of the fifth and sixth 

 segments ; the last has the apex black. The sides of the metanotum 

 bear large deep, clearly separated punctures ; the metanotum is 



TRANS. AM. ENT. SOC, XXXV. DECEMBER, 1909. 



