XVII. HYMBNOPTERA, III: TENTHREDINIDAE. 



By S. A. ROHWER, Bureau of Entomology, United States Depart- 

 ment of Agriculture, Washington, D.C. 



The Tenthredinidae or sawflies collected by the Abor Expedi- 

 tion represent four species, three of which are new, and one new 

 variety. These four species belong to genera which are well 

 represented in the Oriental Region. 



Family TENTHREDINIDAE. 



Subfamily EMPRIIXAE. 



Genus Blennocampa, Has-tig. 



BIcnnocampa gracilicornis, sp. nov. 



This species seems to have its nearest ally in B. lenuicornis of 

 Europe. 



Female. — Length 3"5 mm. Anterior margin of the clypeus 

 broadly, arcuately emarginate ; the lobes triangularly acute at 

 apex ; supraclypeal area subconvex ; antennae separated from 

 the eyes by the width of the base of the scape, separated from 

 each other by the distance, but little shorter than the length of 

 the first two antennal joints ; middle fovea shallow, transverse • 

 frontal foveae deep, elongate ; antennal furrows obsolete ; penta- 

 gonal area obsolete ; eyes large, strongly converging to the 

 clypeus ; postocellar area well defined laterally, about two and one- 

 half times as wide as long ; postocellar line distinctly longer than 

 the ocellocular line ; antennae elongate, slender, hairy ; pedicel 

 subequal in length with the scape, much longer than wide ; third 

 antennal joint slightly longer than the fourth ; claws cleft teeth 

 subequal in length ; transverse median slightly basad of the 

 middle of the cell ; stigma rounded below, tapering to an acute 

 apex ; transverse radius received in the apical fifth of the cell 

 inclined at the same angle as the third transverse cubitus ; apical 

 dorsal segment sharply triangular ; sheath narrow, parallel-sided 

 at apex narrowly rounded ; saw feeb/y ridged, the lower margin 

 regularly, finely dentate with the teeth triangular in outline 

 pointed below. Black ; labrum, scape, palpi and legs yellowish 

 white ; base of the four posterior tibiae and their tarsi white • 

 wings dusky h3^aline ; venation pale brown, costa and basal vena- 

 tion dark brown. 



Dibrugarh, North-East Assam. Described from one female 

 collected November I2th-i9th, 1911. 



Type in the collection of the Indian Museum, Calcutta. 



