264 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 84 



replaced by ferruginous; hind femur and tibia very largely ferruginous; 

 wings dilutely infumate; abdomen almost entirely red, plica yellowish. 



Type locality. — Vernon, British Columbia. 



T^/i^e.— U.S.N.AI. no. 51799. 



Paratypes. — Canadian National Collection; Oregon State Agricul- 

 tural College; Cornell University. 



Remarks. — Described from 24 females and 7 males as follows: The 

 holotype, allotype, and 13 paratypes from Vernon, British Columbia, 

 the holotype taken by D. G. Gillispie, May 16, 1927; the allotype by 

 E. P. Venables, April 12, 1926; the paratj-pes by E. P. Venables, May 

 10, 1903; I. J. Ward, May 20, 1927; M. J. Ruhman, May 18, 1917; 

 E. A. Rendell, May 20, 1925; from Oliver, British Columbia, four col- 

 lected by C. B. Garrett, May 1 and 5, 1923, and E. R. Buckell, April 

 23, 1927; two by P. N. Vroom, May 16, 1922; from Hedley, British 

 Columbia, one by W. B. Anderson, May 5, 1920; from Okanogan 

 Falls, Wash., two by E. M. Anderson, April 27 and 29, 1913 ; from Pull- 

 man, Wash., one by C. V. Piper; one specimen labeled simply "Eastern 

 Wash."; three from Lewiston, Idaho, J. ]M. Aldrich, April 27, 1912; 

 one from Logan, Utah; and one unlabeled. 



8. EXETASTES ILUNOIENSIS (Walsh) 



Plate 17, Figures 18, 26 



Leptobatus illinoiensts Walsh, Trans. Acad. Sci. St. Louis, vol. 3, p. 148, 1873; 



female. 

 Exelastes illinoiensis (Walsh) Cresson, Synopsis of families and genera of Hy- 



menoptera of America north of Mexico, p. 206, 1887. 



Female. — Distinct in the conspicuous yellow markings of the thorax, 

 this species is very similar to ridens Cushman structurally, differing 

 essentially only as follows: Temples less strongly convex and more 

 sloping; eyes less convex; postocellar line distinctly longer than ocell- 

 ocular line; thorax stouter; notauli not at all indicated; mesoscutum 

 more shining and less densely punctate; propodeum more coarsely 

 rugose, especially along a more or less well defined median band. 



Differs from ridens in color as follows: Flagellum reddish, especially 

 below from near base to about the apical third; mandible partly 

 yellow; two broad yellow bands on mesoscutum, confluent behind and 

 ciu-ving backward along the sides to tegulae; humeral angles and some- 

 times a small spot near anterior margin of pronotum, subalar tubercle, 

 tegulae and scutellum, and sometimes postscutellum also, yellow; 

 front and middle legs each with a vii-tually continuous stripe extending 

 from apex of coxa to apex of tibia, their tarsi reddish, paler above, 

 otherwise black; hind leg with a similar stripe beginning at apical 

 joint of trochanter; wings nearly hyaline with costa and base of stigma 

 yellow. 



