486 U. S. NATIONAL MUSEUM BULLETIN 2 1 6 paet 3 



lacking; second tergite mat, with moderate-sized punctm^es that are 

 separated by about 0.5 their diameter; ovipositor sheath about 0.33 

 as long as front wing; teeth on apex of ovipositor moderately close. 



Black. Hind orbit on upper 0.6 ± and top part of front orbit often 

 narrowly fulvous; clypeus and mandible partly ferruginous ; flagellum 

 of female rarely with a white band. 



Specimens: cf, Baldwin [City], Kans., Apr. 11, 1898, J. C. Bridwell 

 (Washington), cf , 9, Ann Arbor, Mich., May 6 and 28, 1959, H. and 

 M. Townes (Townes). cf , Ann Arbor, Mich., Sept. 28, 1959, H. and 

 M. Townes (Townes). cf, Rockcliffe, near Ottawa, Ont., May 29, 

 1942, G. S. Walley (Ottawa). 5 cf , 19, reared from Agrilus vittaticoUis, 

 May 2, 1912, Sept. 24, 1912, and 1914, F. E. Brooks (Washington and 

 Townes), 



This species occurs in the Carolinian fauna. 



2. Genus Echthrus 



Figure 324,b 



Echthrus Gravenhorst, 1829, Ichneumonologia europaea, vol. 3, p. 861, Type: 



Ichneumon reluctator Linnaeus; designated by Westwood, 1840. 

 Sphaetes Bremi, 1849, Stettiner Ent. Zeitung, vol. 10, p. 95. Type: (Sphaetes 



crassicrus 'Brevixi)— reluctator (Linnaeus); monobasic. 

 Karaechthrus Uchida, 1929, Ins. Matsumurana, vol. 3, p. 176. New synonymy. 



Type: Karaechthrus tuherculatus Uchida; original designation. 

 Bioleter Meyer, 1930, Ann. Mus. Zool. Acad. Sci. U.S.S.R., vol. 31, p. 169. New 



synonymy. Type: {Bioleter eos Meyer) = tuberctdatus (Uchida); original 



designation. 



Front wing 7.5 to 20 mm. long; clypeus small to moderately large, 

 usually mth a median apical tooth; sternaulus moderately strong; 

 pleural carina present; basal transverse carina of propodeum absent 

 or vestigial; apical transverse carina of propodeum complete, often 

 forming weak sublateral crests; areolet large, pentagonal; nervulus 

 basad, opposite, or distad of basal vein; nervellus broken above, at, 

 or below the middle; first tergite without a subbasal lateral tooth, its 

 spiracle a little before the middle, its median dorsal carinae absent; 

 second tergite mat, not distinctly punctate (with distinct, usually 

 rather dense punctures in all other Nearctic genera of the subtribe); 

 ovipositor sheath 1.05 to 1.5 as long as front wing; ridges on ovipositor 

 tip close together; tips of lower valves of ovipositor not always enclosing 

 tip of upper valve. 



Echthrus is a small genus, confined to the Holarctic region. It is 

 divisible into three species groups as defined below. In America 

 there are three wide ranging species, each of which has several sub- 

 species. Adults occur in woodlands in late spring and the first hah of 

 summer. They are frequently seen on or about large dead tree 

 trunks. The hosts are wood boring Coleoptera. 



