206 G. E. J. NIXON 



diverged early in the evolution of the tribe. I am at a loss to suggest a relationship 

 with any particular genus, though I think it should be mentioned that the deep 

 notaulices and very short first abscissa of the discoideus point to an affinity with the 

 Microplitis group of genera. These resemblances, however, may indicate only a 

 deceptive convergence. 



Prasmodon eminens sp. n. 



o*. Entirely fulvous-red. Legs yellowish red with the hind tibia at apex and the hind tarsus 

 throughout, blackened. Wings smoky. Antenna broken but segment 16 yellow and indicating 

 that the brown flagellum has a contrasting yellow apex. 



Head deep from back to front, smooth, virtually impunctate ; its sides behind the eyes 

 almost straight (Text-fig. 246). Pubescence of flagellum extremely short, not upstanding. 



Keels of the propodeum strongly raised ; the areas enclosed by them smooth. Claws with a 

 few fine, colourless pectinations at base. 



Tergite 1 about two and one third times longer than its greatest width (at base). The mem- 

 branous anterior corner of tergite (2 -+- 3) is separated from the rest of the tergite by a smooth, 

 raised ridge ; tergite (2 + 3) smooth, shining, and without a delimited basal field. 



Length: 5 mm. 



Peru : Chanchamayo, 18.viii.194g, 1 <$, the TYPE, (J. S. Schunke). 

 Type in the British Museum (Nat. Hist.). 



S EM 10 NIS gen. n. 



Type-species : Semionis rants sp.n. 



Head large, deep from back to front. Mandibles unusually wide at base (Text-fig. 247). 

 Palpi very short, the labial palpus 3-segmented. Antenna with 18 segments ; scape short. 

 Ocelli in a high, almost equilateral triangle. 



Side of pronotum without a dorsal furrow. Lateral, polished zone of the scutellum only feebly 

 convex in the forwards direction ; hence cutting off between itself and the disc of the scutellum 

 a tongue-shaped rugose area that is nowhere parallel-sided. Propodeum having a flattened, 

 polished appearance, completely without areolation and medially completely smooth. Trans- 

 verse cubitellan vein of the hind wing wanting ; 1st abscissa of the discoideus of the fore wing 

 about half as long as the 2nd. Claws simple. 



In lacking the spurious transverse cubitellan vein of the hind wing, this species is 

 almost transitional between the Microgasterini and the Cardiochilini, though on a 

 majority of characters it has much more in common with the former tribe than with 

 the Cardiochilini. In the Cardiochilini, the labial palpus is 4-segmented ; the an- 

 tenna is multiarticulate, deep notaulices are present and the shape of the 1st tergite 

 is essentially different from what occurs in Semionis. The shape of the 1st cubital 

 cell is quite different in the Cardiochilini. 



Semionis rarus sp. n. 



o". Blackish ; face slightly paler along the inner orbits ; tergite 1 and rather more than the 

 basal half of tergite (2 + 3) yellowish, with tergite 1 showing darker suffusion where it turns over. 

 Hind coxa brown but paler apically ; hind femur and hind tibia yellow ; hind tarsus weakly 

 infuscate. Wings slightly embrowned ; the venation evenly dark brown. Mandibles and 

 labrum yellow. 



