206 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.43. 



scattered punctures; postocellar area slightly longer than the latrad 

 width; antennas 25-jointed, the third joint about one-fifth longer 

 than the fourth; mesonotum polislied, with a few scattered punc- 

 tures; hypopygidium broadly rounded apically. Black; front below 

 crest except the antennal furrows, scape beneath, spot on mandibles, 

 palpi, spot on superior posterior orbits, tegulse, spot on meso- and 

 meta-scutellums, four anterior legs below trochanters, and posterior 

 femora bright yellow; abdominal segments four to six rufous; wings 

 hyaline, viterous; venation pale brown. 



Oxbow, Saskatchewan, Canada. Two males, one June 19, 1907 

 (type), the other June 15, 1907, collected by Fredrick Knab.. 



Type.— C^i. No. 14511, U.S.N.M. 



Superfamily TENTHREDINOIDEA. 

 Family ARGIDyE. 



Genus ARGE Schrank. 

 ARGE GEEI, new species. 



Very like pagana (Panzer) but may be se])arated from it by the 

 following characters: Apical margin of the clypeus subdepressed; 

 frontal basin slightly broadening in front of the anterior ocellus; 

 postocellar luie subequal with the ocollocular line (in pagana it is 

 much less); the basal joint of the anterior and posterior tarsi longer; 

 abdomen with fine, short hair the color of the tergument; nates more 

 sharply pointed; and minor, unimportant differences in venation. 



Soochow, China. Six females from N. Gist Gee, for whom the 

 species is named. 



Type.— Cat. No. 14484, U.S.N.M. 



ARGE SALICIS, new species. 

 Hylotoma pectoralis Schwarz, Proc. Ent. Soc. Wash., vol. 11, 1909, p. 106. 



The type of Arge pectoralis Leach is apparently lost, at least it is 

 not in the British Museum, and as the description applies equally well 

 to any one of a number of species, it is deemed advisable to consider 

 the species described by Leach as undeterminable. 



Salicis is related to dulciaria Say, as determined b}^ Walsh, but may 

 be separated from that species by the middle basin being closed 

 below and distinctly separated from tlie middle fovea. There are 

 also some differences in the saws and tlie genitalia, and these will be 

 figured and described elaborately in a revision of the American 

 Arginse. 



Plummer's Island, Maryland. Many males and females collected, or 

 bred from larvae, on the Salix niger. 



Type.— C&t. No. 14759, U.S.N.M. 



The above short description is offered at this time so the parasites 

 of this species may be given their correct host's names. 



