AMERICAN HYMENOPTERA. 107 



$. Shining- black ; body short and stout; anteiinno slender; joints 

 of nearly equal length; lower ocellus in a shallow basin ; nasns hardly 

 incurved; teguhie and collar whitish; coxae, femora, tips of posterior 

 tibife and of all the tarsi black; claws slightly dentate within; tro- 

 chanters, anterior femora before, tibife and tarsi, except at tip, white ; 

 wings hyaline, stigma and costa pale greenish, second submarginal 

 widest at first recurrent nervure. 



Labrador, (A. S. Packard, Jr.) Three $ . 



■i. N. extensicornis. 



Nematus extensicornis, Norton, Proc. Bost. Soc. viii. 1861, 159, %. 

 Black; tip of venter yellow-red; knees and tibiae pale. Length 0.27. Br. 

 wings 0.00 inch. 



% . Shining black. Antennae as long as body, slender, cylindrical, 

 jiunctured, pilose with upright hair, joints slightly globose at tip, third 

 liardly as long as fourth ; lower ocellus in a basin; nasus retracted, 

 with a shallow, wrinkled notch in the middle; apical third of venter 

 and anal styles pale fulvous; legs black; the knees, tibiae and tarsi 

 reddish-white, the latter darker above, claws yellowish, with a very 

 short inner tooth (slightly dentate). Wings hyaline, stigma and cos- 

 ta pale, second submarginal widest at first recurrent nervure; second 

 recurrent nervure received at or very near the intersection of second 

 and third cells. 



9 • Antennae about two-thirds the length of body, tips of joints not 

 so much enlarged, third and fourth joints of equal length, edge of na- 

 sus and labrum yellowish; legs below the knees darker, stigma and 

 costa white. 



Mt. Washington, N. H. Summit. One % , one ? . (S. II. Scudder 

 and liarou Osten Sacken). 



5. N. marylandicus. 



Nematus viarylandicus, Norton, Proc. Ent. Soc. iii, 1864, 7, %. 

 Black ; ape.x of abdomen rufolis, knees and part, of tibiae whitish ; wings hya- 

 line. Length 0.2S. Br. wings 0.60 inch. 



%. Black; body long and uot stout; antenna? as long as body, 

 slender, cylindrical; joints not so much enlarged at tips as in N. cx- 

 ?e«.s(C6»/-«;8, pilose ; head and thorax with short whitish hair, that on 

 labrum longer, brownish; lower ocellus in a basin, which is open at 

 top and bottom; nasus with a deep, angulate notch; apical segment 

 of abdomen yellowish piceous, most apparent beneath ; legs black, 

 their four anterior knees, tibiae and tarsi beneath and at base above, 

 and basal half of posterior tibiae whitish; nails piceous, tips red. 

 Wings hyaline, stigma and costa pale; second submarginal widest at 



