AMERICAN HYMENOPTERA, 317 



THE ]!lfORTH AIVIERIC AK ORYSSID^. 



BY J. CHESTER BRADLEY. 



The following characters serve to distinguish the family : meta- 

 thorax not fissured in the middle ; vertex tuberculate ; front wings 

 with two submarginal cells ; the antennce inserted in a groove below 

 the elypeus ; and the abdomen cylindrical. The ovipositor is in 

 many specimens exerted, evidently at the will of the insect. 



Out of four genera, Oryssus of Latreille, Chalinus, Ophrynopus 

 and Mocsarya of Konow, two are represented in North America. 



Face bi-carinate Ophrynopns Konow_ 



Face not carinate Oryssus Latreille. 



OPHRYKOPUS Konow. 

 1897, Ophrynopus Konow, Termeszetrajzi Fiizetek, xx, p. 602. 



Face with two longitudinal carinje, which are united by a third 

 carina above ; a short carina is also present beneath each eye ; ver- 

 tex tuberculate.; abdomen cylindrical. 



Ophrynopus niexioan lis Cresson. -^^ / 



1879, Oryssas mexicnnas Ores., 9 , Pi'oc. Ent. Soc. Pbila., Acad. Nat. Sci., p. xi. 

 1897, Ophrynopus mexicanus Konow, 9) Termeszetrajzi Fiizetek, xx, p. 606. 



9 . — Black. Face rough, with two longitudinal carinse divergent at base and 

 approaching above, where they are united by a third ; above this is a semi-circle 

 of tubercles; cheeks prominent, silvery sericeous; edge of elypeus reflexed ; a 

 short carina below each eye; antennee black, inserted below the elypeus; pro- 

 thorax silvery sericeous ; mesothorax with a smooth ridge in the middle, and 

 several distinct cariniB around each tegula; the sides of the first and second ab- 

 dominal segments are also slightly carinate; wings fuscous, pale beneath the 

 stigma ; legs dark ferruginous, almost black : tibite silvery sericeous on the out- 

 side edge; posterior tibiae w^th a double row of short teeth on the outside edge; 

 abdomen dark, slightly ferruginous towards the base of each segment. Length 

 15 mm. 



Habitat. — Mexico. 



Type in the collection of the American Entomological Society. 



ORYSSIJ!!$ Latreille. 

 1796, Oryssus Latreille, Prec. car. gener. Insect., p. 111. n. 10. 



Face without carinse; vertex tuberculate; abdomen cylindrical. 

 There are four North American species, founded chiefly on color 

 characters, though probably constant ones. 



TRANS. AM. ENT SOC, XXVII. NOV., 1901. 



