TEXAN HYMENOPTERA. 163 



white; extreme tips of posterior femora, apical third of their tibiae, and first 

 and last tarsal joints, black; abdomen narrow, shining, ferruginous, the three 

 apical segments black. Length .35 inch. 



One specimen from Comal Co. A very distinct species. 



Mesostenus dejcctus, n. sp. 



9- — Head and thorax dull black, legs and abdomen dull ferruginous; an- 

 terior margin of labrum white j mandibles piceous ; palpi pale; antennae 

 black, with joints 8 — 10 white above; mesothorax densely, rather finely punc- 

 tured, surface even; scutellum shining, subconvex; metathorax coarsely ru- 

 gose, with a prominent, obtuse, whitish, lateral tubercle, and a well defined, 

 transverse carina near base, before which the surface is much less coarsely 

 sculptured; wings fusco-hyaline, areolet subquadrate, apical nervure obsolete ; 

 legs and abdomen uniformly ferruginous, the latter subsericeous, first segment 

 shining and broadly dilated at apex; ovipositor not more than half the length 

 of abdomen. Length .50 inch. 



Two specimens from Comal Co. 



Mesostenus thoracicus. 



Mesostenus thoracicus, Cress. Proc. Ent. Soc. Phil, iii., p. 314. 

 One $ specimen. (Belfrage.) 



Mesostenus gracilis. 



Mesostenus gracilis, Cress. Proc. Ent. Soc. Phil, iii., p. 314. 

 One £ specimen. (Belfrage.) 



Mesostenus pertinax, n. sp. 



9-— Head, pro- and mesothorax and anterior portion of pleura black; 

 orbits, broad on cheeks, face except a median black dot, clypeus, mandibles 

 except tips, palpi, upper lateral margin of prothorax, two abbreviated lines on 

 disk of mesothorax, scutellum, postscutellum, tegulee, and three spots on 

 pleura, the lower one large and oblique, white ; metathorax and posterior part 

 of pleura, honey-yellow; a large triangular mark behind each posterior wing, 

 a spot on flanks of metathorax, and a broad, almost circular, line on posterior 

 face, white; pleura beneath pale honey-yellow; antennae slender, blackish 

 above, with a narrow whitish annulus, beneath pale on basal half; mesothorax 

 with middle lobe rather prominent; metathorax with posterior face trans- 

 versely wrinkled and with short obtuse lateral tubercles; wings hyaline, 

 faintly dusky at extreme tips, areolet small, 5-angular, apical nervure hyaline; 

 legs honey yellow, anterior coxa? and trochanters whitish, posterior tarsi whit- 

 ish between base and apex ; abdomen entirely honey-yellow or pale ferrugi- 

 nous, smooth and shining; ovipositor very short. Length .30 inch. 



One specimen. (Coll. Gr. W. Belfrage.) Allied to thoracicus and 

 gracilis. 

 Mesostenus arvalis, n. sp. 



9 .—Honey-yellow, vertex, occiput and mesothorax more or less, tinged 

 with fuscous; face and orbits whitish; antennae black, with a narrow white 

 annulus about midway, scape pale beneath ; prothorax pale with whitish mar- 

 gins and a transverse black band behind the head; mesothorax with deeply 

 impressed lines; pleura pale, with indistinct whitish spots; tegulae whitish; 



