MEXICAN IIYMENOl'TERA. 37 



large; anteonae long, setaceous; thorax short, broad in front, gibbous ; 

 mesothorax with deeply impressed dorsal lines; scutellum convex; 

 ijietathorax rounded above, abruptly truncate behind, elevated lines 

 sharply defined, lateral angles prominent; stigma large, areolet very 

 small, oblique and petiolated; legs rather robust, posterior trochanters 

 long and slender, their femora swollen, tarsal claws simple; abdomen 

 arcuated, subsessile, flattened, broader at tip, which is subcompressed ; 

 ovipositor as long as first segment. Length 2 lines. 

 One 9 specimen. 



EXOCHOIDES, n. gen. 

 This genus is closely allied to Exochiis. but differs by the flat face, 

 longer antennae, less robust legs and by the subpetiolate and clavate 

 abdomen. The anterior wing is without an areolet, the dividing nervure 

 between the first and second submarginal cells being straight and con- 

 tinuous, or nearly so, with the second recurrent nervure, which is more 

 or less angular. 



1. Ezoclioides mexicana, n. sp. 



% . — Lemon-yellow ; head and thorax clothed with pale pubescence ; 

 head black, labrum. mandibles and palpi yellowish; antennae reddish- 

 brown, paler at base, scape yellowish; spot on each side of prothorax, 

 three broad stripes on mesothorax, mark beneath wings, tips of poste- 

 rior femora, broadly so within, tips of their tibiae, median spot on first 

 segment of abdomen and basal half of remaining segments, black ; 

 tarsi brownish ; wings yellowish-hyaline, dusky at tips, nervures ful- 

 vous. Antennae nearly as long as body ; mesothorax delicately punc- 

 tured and shining; sides of prothorax and of pleura behind, concave; 

 metathorax smooth and polished, subcanaliculate; abdomen smooth 

 and polished. Length 5 — B lines. 



Six % specimen. (Sumichrast Coll. No. 3.) 



2. Exochoides concinna, n. sp. 



S . — Black, shining, thinly clothed with a short, fine, pale pubes- 

 cence, sightly silvery in certain lights; anteunte reddish-brown, scape 

 whitish above ; upper margin of prothorax, scutellum except base, 

 postscutellum, two spots on metathorax behind, spot on posterior coxae, 

 tips of anterior femora before, most of their tibi;e, subbasal spot on 

 the four posterior tibiae, base of first segment of abdomen, apical mar- 

 gin of three basal segments, narrow lateral margin of fourth segment. 

 and the apical segment entirely, white; wings subhyaline. iridescent. 

 marginal cell fuliginous ; femora tinged with reddish. Antennai more 



