242 PROCEEDINGS OF THE NATIONAL MUSEUM vol.88 



pronotum, as in Leucospis (fig. 10, a) ; forewings always with a dis- 

 tinct cell indicated posterior to marginal vein (fig. 6), never with an 

 isolated fragment of base of M+Cui preserved in wing, as in 

 Leucospis (fig. 10, g) \ hindwing always with three hamuli (except 

 in some species of the nigricomis group of Spilochalcis) ; metacoxae 

 enlarged, long, round in cross section ; metaf emora enlarged, provided 

 with more than one tooth on outer ventral margin (figs. 11, h-k; 12) ; 

 metatibiae completely arcuate and provided with only one apical spur 

 (fig. 11, A), never incompletely arcuate and provided with two apical 

 spurs, as in Hdltichella (fig. 11, p') ; propodeum provided with a pair 

 of slitlike spiracles (fig. 13, h) ; abdomen distinctly petiolate, petiole 

 always with a basal lamina (fig. 13, d-j), never sessile; petiole arising 

 from apex of propodeum, never far up near apex of mesoscutellum ; 

 cerci reduced to a pair of disk-shaped setigerous sclerites, which are 

 placed well in from posterior margin of epipygium (fig. 13, /-;'), 

 never distinctly produced and articulated at base, as in Podagrion 

 (fig. 14, h) ; male genitalia (fig. 14, o) composed of an outer mem- 

 branous sheath, a sclerotized inner sheath {Sh)^ a pair of toothed 

 sagittae (Sag), and a pair of apically fused penis valves (Oe). 



KEY TO GENERA OF CHALCmiNI 



1. Female, ninth sternite concealed, anteunal scape narrow 2 



Male, ninth sternite exposed, antennal scape broad 6 



2. Hypopygium produced posteriorly to or beyond apex of abdomen, 



ovipositor arising near apex (fig. 13, f, g, j) 3 



Hypopygium absent or very indistinct, ovipositor arising far 



forvfard (fig. 13, d, h, i) 4 



8. Metafemora with three or four large, slightly curved teeth (fig. 

 11, fc) ; anterior dorsal margin of pronotum with a lamina 



extending completely across Metadontia 



All metafemoral teeth, except basal one, small, none curved 

 (fig. 11, i, j) ; anterior dorsal margin of pronotum acarinate 

 mesally Chalcis 



4. Abdominal petiole long, slender, three-fourths or more length 



of metacoxa 5 



Petiole short, usually stout, always only one-half or less length 



of metacoxa Spilochalcis 



5. Parapsidal furrows distinct, apex of mesoscutellum without pro- 



jections Ceratosmicra 



Parapsidal furrows obliterated, apex of mesoscutellum with two 

 prominent, upturned projections Xanthomelanus 



6. Claws of protarsi bifid at apices (fig. 11, a-f), ninth sternite of 



abdomen emarginate at apex (fig. 14, Or-g) Chalcis 



Claws of protarsi simple, ninth sternite entire or very obscurely 



emarginate 7 



7. Petiole long and slender, always more than four-fifths length of 



metacoxa 8 



Petiole always less than two-thirds length of metacoxa 9 



