﻿118 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lOO 



(Washington) . cT , reared from host in Tilia americana, Clarks Valley, 

 Pa., J. N. Knull (Washington). 7 d', 17 9, Harrisburg, Pa., 1921, 

 A. B. Champlain (Washington), cf , reared from host in Carpinus, 

 Harrisburg, Pa., 1921, Champlain and Knull (Washington), d^, 2 9, 

 reared from Xiphydria in Tilia, Harrisburg, Pa., May 19 and 23, 

 1913, A. B. Champlain (Washington), cf, reared from Xiphydria 

 attenuata in Tilia americana, Harrisburg, Pa. (Washington). 9, 

 Spring Brook, Pa., May 27, 1945, H. K. Townes (Washington). 

 9, Plainfield, Vt., June 21, 1941, R. H. McCauley (Townes). 



This species occurs in the Transition Zone from Quebec to Mary- 

 land. It parasitizes Xiphydria, usually in Tilia and Carpinus. 



5. AULACUS DIGITALIS, new species 



Figure 16, m 



Process on female hind coxa not less than 1.4 as long as wide. 



Female: Forewing about 6.5 as long as wide; sculpture of frons 

 approximately as in figure 16, m, rather concentrated in a transverse 

 band and usually more irregular and more punctate than in related 

 species; third flagellar segment about 5.3 as long as wide; pronotum 

 partly punctate and partly rugose; dorsal face of propodeum strongly 

 declivous anteriorly; process on hind coxa about 1.7 as long as wide; 

 hind femur about 5.0 as long as wide; abdomen about 2.7 as long 

 as wide; ovipositor sheath about 0.90 as long as the forewing. 



Head medium brown, darker above and behind; face, cheeks, man- 

 dible except apical part, and scape brownish stramineous; thorax 

 dark brown or blackish; legs light brown to blackish brown, the 

 second trochanters, extreme ends of femora, tarsi, fore and middle 

 tibiae, and ends of hind tibia stramineous to pale brown; abdomen 

 ferruginous, the first segment black basally. One specimen has the 

 abdomen mostly blackish brown above except for broad transverse 

 ferruginous bands centering on the first and second incisures. 



Male: Similar to the female but a little more slender; the sculpture 

 of the frons a little weaker and more restricted; the third flagellar 

 segment about 8.0 as long as wide; and colored as follows: Head 

 fulvous, brown above and with the face and cheeks stramineous; 

 mandibles except apically, palpi, and scape brownish stramineous; 

 flagellum blackish basally, shading to pale brown apically; thorax 

 blackish brown, the propleurum, pronotum except dorsally, and more 

 or less of the mesosternum brownish stramineous; legs brownish 

 stramineous, the hind coxa brown and the middle coxa often light 

 brown; abdomen ferruginous, the basal part of the first segment 

 blackish. 



Type: U. S. N. M. No. 58828, 9, emerged from dead wood, Putnam, 

 Conn., May 7, 1913, H. B. Kirk (Washington). 



