400 MEMOIRS OF THE CARNEGIE MUSEUM 



Physothorax variabilis (Mayr). 



Diamorus variabilis Mayr, Verh. Zool.-bot. Gesell. Wien, XXXV., 1885, p. 228, 9. 



— Dalla Torre, Cat. Hym., V., 1898, p. 291. 

 Physothorax doTsiger Mayr, Verh. Zool.-bot. Gesell. Wien, XXXV., 1885, p. 197 



(wingless cJ^).— Dalla Torre, Cat. Hym., V., 1898, p. 321. 



Physothorax mayri, sp. nov. 

 Female. — Length, 2'.6 mm.; ovipositor about as long as the body. Similar to P. 

 variabilis Mayr, but the punctures of the head and thorax are not so close, the 

 scape and the pedicel being yellow, the prothorax being wholly blue, not all yellow 

 or in part, as in P. variabilis, the femora, except at tips, being mostly blue, while 

 the front wings have a brownish fascia beneath the stigmal vein, a character found 

 in no other species. 



-'^^^^^^- Genus PLESIOSTIGMA Mayr. 



Plesiostigma bicolor Mayr. 



Plesiostigma bicolor Mayr, Verh. Zool.-bot. Gesell. Wien, XXXV,' 1885, p. 227, (^ ; 

 Taf XIII., f. 39, 40.— Dalla Torre, Cat. Hym., V., 189^, p. 316. 

 Brazil : Blumenau (Dr. Fritz Miiller). 



PLESIOSTIGMODES Ashmead, gen. nov. 



This genus differs from all the other genera in the subfamily by the much 

 swollen front femora, by the very long pronotum, which is longer than the mesono- 

 tum, and by the antennae having two ring-joints. 



Plesiostigmodtjs brasiliensis, sp. nov. 



Female.— Length 1.5 mm. Head bluish seneous, with some minute punctures, 

 the thorax more decidedly seneous, with a decidedly metallic greenish tinge on the 

 mesonotum and on the scutellum, and with some sparse, minute punctures ; the 

 thickened front and hind femora are also more or less greenish, the rest of the legs, 

 except the coxse, and the scape of the antennse being yellowish, the pedicel and the 

 flagellum brown-black ; the abdomen, except a bluish tinge basally, is seneous black ; 

 it is sessile, oblong and tapers off at apex, the first segment being the longest and 

 having a slight median incision at apex. Wings hyaline, the tegulse and veins pale 

 yellowish. 



Brazil : Corumba, lowland in May. One specimen. 



HEMITORYMUS Ashmead, gen. nov. 



This genus is allied to Cryptopristus Forster, but is easily separated by the hind 

 femora being feebly serrate, without a distinct tooth, and by the venation in the 

 front wings which agrees with Torymus and is quite different from Cryptopristus. 



