106 U. S. NATIONAL MUSEUM BULLETIN 216 



Colored like the male of P. decumbens except that the mandible has 

 a large, subbasal, triangular, ochreous area. 



Female: Front wing 9.5 to 11.5 mm. long; face unusually wide and 

 flat; clypeus about 2.6 as wide as long; temple rather strongly convex, 

 in profile about 0.7 as long as eye (in females of the other Nearctic 

 species the temple is only moderately convex and in profile only about 

 0.57 as long as eye); thorax unusually short and densely punctate; 

 first tergite about 1.05 as long as wide; punctures on second to fourth 

 tergites unusually dense; ovipositor sheath about 4.5 as long as front 

 wing; dorsal part of basal three teeth of ovipositor tip turned forward 

 almost horizontally; upper valve of ovipositor with two blunt ridges 

 near level of basal teeth on the lower valve, these teeth more distinct 

 than in P. spatulata. 



Colored like the female of P. spatulata. 



This species occurs also in Europe. We have seen two males from 

 Finland (Helsinki museum) which are indistinguishable from Nearctic 

 males, and some of the paratype females of Ephialtes duplicauda 

 Heinrich, from southern Germany, seem to be typical P. brevis. The 

 type of E. duplicauda, however, is a little different from those para- 

 types, and may not be the same species. 



Specimens: 9, Banff, Alta., Aug. 10, 1938, G. S. Walley (Ottawa). 

 9, Cowley, Alta., 191- R. N. Chrystal (Washington). 9, Aweme, 

 Man., June 30, 1925, R. D. Bird (Ottawa). 9, Frater, Ont., Aug. 5, 

 1925, C. E. Youch (Ottawa). 9, Niagara Glen, Ont., June 23, 1926, 

 G. S. Walley (Ottawa). 9 (lectotype), St. Martin's Falls, Albany 

 River, Ont. (London). 9, Laniel, Que., July 12, 1931, M. B. Dunn 

 (Ottawa). 79, collected near logs containing nests of Megachile, 

 Torch River, Sask., September 1944, Clark (Ottawa and To wnes). 2 c?, 

 reared from Megachile nivalis, White Fox, Sask., May 1945, O. Peck 

 (Ottawa and To wnes). 29, reared from Megachile inermis, White Fox, 

 Sask., May 1945, O. Peck (Ottawa). d\ taken from Megachile cell 

 in Populus, White Fox, Sask., 1945, O. Peck (Ottawa). 



This species is transcontinental in the Canadian zone and occurs 

 also in northern and central Europe. Megachile spp. nesting in logs 

 serve as hosts. 



4. Pimpla spatulata, new species 



Figures 330,a; 343 



Male: Front wing 4.8 to 7.5 mm. long; hairs on lower half of temple 

 inclined, about 0.35 as long as labial palpus; hairs on combined costa 

 and subcosta mostly suberect, most of them about 0.8 as long as the 

 stigma is wide; nervellus broken near its upper 0.32; submetapleural 

 carina present on front 0.5 ± of metasternum; first tergite about 1.5 



