274 
Psyche 
[December 
branches in neotropica and amazonica. This species also differs from 
the latter two species in having 5-toothed mandibles, dentate claws, 
a groove connecting the two scutellar pits, and some unusual sculptur- 
ing on the sides of the thorax and propodeum. It is possible that 
mexicana should not be regarded as congeneric with neotropica and 
amazonica , but considering the fact that all three species are known 
from only one specimen ( in each case a male ) , as well as the many 
problems of generic classification in this section of the Epyrini, it 
seems best to be conservative. 
Holotype . — cT , MEXICO: 23 mi. S Matias Romero, Oaxaca, Aug. 
14, 1963 (F. D. Parker & L. A. Stange) [MCZ]. 
Description of male type. — Length 6.2 mm; LFW 3.8 mm. Black, 
head and thoracic dorsum with a faint bluish cast, last two abdominal 
segments rufous; mandibles rufo-testaceous; scape black, flagellum 
dull ferruginous, the branches dusky; coxae black, legs otherwise 
wholly bright rufo-testaceous; wings lightly tinged with brown. 
Mandibles with a large apical tooth and four small teeth in a slightly 
oblique series; clypeus broadly angulate, its median carina nearly 
straight in profile. Antennae strongly pectinate; segment three con- 
siderably shorter than two, much wider than long, bearing a rather 
short process; segments 4-12 each bearing a slender process slightly 
longer than the segment proper (segments 4 and 12) up to about 
3 X as long as the segment proper (segments 7-10) ; segment 13 
elongate, clavate; segments 2-5 each bearing long, erect setae, fol- 
lowing segments with shorter setae but with long setae on the proc- 
esses, these setae much longer than the width of the processes. Head 
unusually broad, WFI 1.25 X LH ; front broad, WF .70 X WH, 
1.50 X HE; vertex broadly rounded off a short distance above eye 
tops; ocelli in a broad triangle, WOT slightly exceeding OOL. 
Front polished, non-alutaceous, with small, widely spaced punctures. 
Thoracic dorsum slightly alutaceous, duller than front; pronotal disc 
sloping gradually toward the front and its sides approaching to a 
rounded anterior margin, the disc not at all prominent antero-lat- 
erally; scutellar pits large, subcircular, separated by slightly less than 
their own diameters, connected by a very slender but fairly deep 
groove. Propodeal disc 1.15 X, as wide as its median length, with 
three strong discal carinae between which it is transversely ridged; 
laterad of the discal carinae the surface is smoother, but there is a 
low longitudinal ridge between the lateral discal and strong sub- 
lateral carinae; propodeal side-pieces polished, with several prominent 
longitudinal ridges which are continuous with similar ridges on the 
