456 U. S. NATIONAL MUSEUM BULLETIN 216 



on tibiae averaging about 1.2 as long as diameters of tibiae; tooth 

 on hind femur about 1.4 as high as its basal width, distinctly separated 

 by a rounded notch from the ventral longitudinal ridge on femur 

 just distad of the tooth, intercubitus not more than 0.3 as long as 

 second abscissa of cubitus, sometimes almost obliterated by approxi- 

 mation of radial and cubital veins; nervulus postfurcal by about 

 0.25 its length; apical half of first tergite with sharp irregular punctures 

 and little if any wrinkling or striation; most of second and basal 

 0.6 ± of third tergite with fine close aciculation, this mostly trans- 

 verse; ovipositor sheath about 2.1 as long as front wing. 



Black. Legs and abdomen fulvoferruginous ; wings faintly brownish. 



Specimens: 29, Cheaha State Park, Ala., Apr. 26, 1940, E. C. 

 VanDyke (San Francisco and Townes). 9, Rabun Bald, Ga., Aug. 

 23, 1928, P. W. Fattig (Townes). 9, Stone Mt., Ga., Nov. 18, 1945, 

 P. W. Fattig (Washington). 9 (type), Pennsylvania (Philadelphia). 

 d\ near Tigerville, Greenville Co., S. C, May 8, 1944, H. and M. 

 Townes (Townes). 9, Call, Tex., Mar. 2, 1905, W. F. Fiske (Wash- 

 ington). 9, Falls Church, Va., N. Banks (Cambridge). 



This species occurs from Pennsylvania to Texas. 



II. POLYMORPHUM GROUP 



Body form normal for the genus except that thorax tends to be 

 slender; metapleurum and propodeum rugulose or rugulosopunctate; 

 middle tibia simple, without an oblique groove on its posteroventral 

 side; tibiae and tarsi without long hairs, with only the short clothing 

 hairs; hind femur with a longitudinal carina on distal side of its 

 ventral tooth, the outline of carina weakly concave in profile; tooth 

 on hind femur 0.5 to 1.0 as high as its basal width; wings often short 

 or absent, when fully developed with the ramellus often long and 

 intercubitus about 0.3 to 0.7 as long as second abscissa of cubitus; 

 first tergite rather short, covered with longitudinal striae and some- 

 times with some inconspicuous punctation . 



This group includes the three Nearctic species described below, 

 and possibly, judging by its description, the European Odontomerus 

 appendiculatus Gravenhorst, 1829. 



3. Odontocolon pullum, new species 



Wings absent or present, when fully developed 5.3 to 5.5 mm. long; 

 head and body 5.7 to 7.7 mm. long; head about 1.0 as wide across 

 temples as across eyes;, punctures on temple moderately large, weak, 

 separated by about 2.0 their diameter; second tergite of male with 

 sharp, small or medium sized punctures, separated mostly by about 

 their diameter, the basal 0.5 ± of the tergite also with longitudinal 

 wrinkling between the punctures; second tergite of female with sparse 



