176 AMERICAN HYMENOPTERA. 



Tenthredo xaiithus Nort. 

 Magdalena Mts., July, 1894. 



Pteronus trilineatus Noit. 



Magdalena Mts. One taken in Aug., 1894. 



Atomocera ruficollis Nort. 

 Magdalena Mts., Aug., 1894. 



SIRICOIDEA. 

 Sirex albicornis var. CHliroriiia Nort. 

 Magdalena, Magdalena Mts., Aug., 1904. 



Sirex fulvous Cress. 



Magdalena Mts., July, 1894. 



WYOMING. 

 TENTHREDINOIDEA. 

 Pterouus koebelei Marl. 



Twelve miles northwest of Lusk, July, 1895 (U. ofK., lot 478''. 



Schizocerus pluuiiger Klug. 



Forty miles north of Lusk, July, 1895 (U. of K., lot 48). 



Schizocerus abdomiualis Cress. 



Forty miles north of Lusk, July, 1895 (U. of K., lots 423, 418, 

 415, respectively). 



KANSAS. 

 ICHNEUMONIDEA. 

 Melanobracon uluiicola d. sp. 



This species has been confused with simplex, from which it ditiers 

 in the margined, very acute, triangular area of the second abdomi- 

 nal segment. 



9.-9 mm. — Head. — Shining and polished, and as usual apparently devoid of 

 sculpture ; scape about as long as the first and second joints of the flagellum com- 

 bined, these latter joints subequal, the first joint a little longer than the second, 

 pedicellum about half as long as the first joint of the flagellum, antenna^ fifty- 

 five jointed. 



Thorax. — Smooth and polished, with the parapsidal grooves deeply impressed 

 on the anterior half of the dorsuUim ; wings almost completely fuscous, the 

 stigma very dark brown, the nervures dark brown but somewhat paler than the 

 stigma, first submarginal cell with the membrane partly whitish, the third dis- 



