318 J. CHESTER BRADLEY. 



Six apical segments of abdomen red Occident alis Cresson- 



Only three apical segments of abdomen red terniinali$« Newman. 



Abdomen entirely black. 



Thorax red tlioracictis Ashmead. 



Thorax black May i Westwood. 



Oryssus occideiitalis Cresson. 

 1879, Oryssus occidentaiis Cresson, 9 % > Proc. Ent. Soc. Acad. Nat. Sci. Phila., 

 1879, p. X. 

 % 9- — Black, except the 6 posterior segments of the abdomen and variable 

 white spots on the antennae, between the eyes, on the knees and tibise, and at 

 the tip of the abdomen ; face rough, vertex tuherculate ; cheeks prominent ; wings 

 hyaline, fuscous or sub-fuscous beyond the stigma, except at the apex ; abdomen 

 black, six apical segments red. Length 8-14 mm. 



Habitat. — Colorado, Nevada. 



Types in the collection of the American Entomological Society. 



Oryssus terminalis Newman. 

 1838, Oryssus terminalis Newman, 9? Entom. Mag., v, p. 486. 

 1841, Oryssus hxmorrhoidnlis T. W. Harris, Treat. Insec. Mass., p. 394. 



Black, except the three posterior segments of the abdomen, and variable white 

 spots on the antennge, between the eyes, on the knees and tibiae, and sometimes 

 at the tip of the abdomen; face rough, vertex tuberculate; cheeks prominent; 

 wings more decidedly fuscous beyond the stigma than in most specimens of 0. 

 occidentaiis; abdomen black, except the three apical segments, which are red. 

 Length 9-15 mm. 



Habitat. — Canada, Massachusetts, Pennsylvania, New York. 



Oryssus thoracicus Ashmead. 

 1898, Oryssus thoracicus Ashmead, Can. Ent., xxi, p. 178. 



^ . — Similar to the other species, except that the two first five and the apical 

 joints of the antennse, the thorax and the legs are red ; the abdomen is black. 

 Length 4.75 mm. 



Habitat. — Santa Cruz Mountains, California. 

 I have not seen this species. 



Oryssus sayi Westwood. 

 1830. Oryssus sayi Westwood, 9i i^ool. Journ., v, p, 440. 

 1841, Oryssus maurus T. W. Harris, Treat. Insec. Mass., p. 394. 

 1841, Oryssus affinis T. W. Harris, Treat. Insec. Mass., p. 394. 



Black, except for white markings on antennse, legs, etc. ; face rough ; vertex 

 tuberculate; cheeks }>rominent ; wings hyaline, more or less fuscous beyond the 

 stigma, except at apex ; black. Length 10-15 mm. 



Habitat. — Canada, Massachusetts, Oregon (Mt. Hood). 

 Var. affinis has red legs. 



