BNTOMOLOGISCHE BERICHTEN. 91 



A new sawfly from Holland. 



Pteronus xanthostomus n. sp. 



Related to Pteronus melanaspis (Hartig) as determined by 

 F. W. Konow, but has the stigma dark brown, the head duller, 

 the postocellar furrow longer and better developed and the 

 sutures of the mesonotum and scutellum largely pale. In 

 coloration this species is similar to Pteronus ribesi (Scop.), but 

 otherwise it is a very different insect. 



Female: Length 6mm. Clypeus short, arcuate in the middle, 

 the lobes short and broadly rounded; supraclypeal area broadly 

 convex; antennal foveae small above but below they join the 

 -lateral supraclypeal foveae; middle fovea small, deep, well 

 defined, oval; frontal crest straight; ocellar basin pentagonal 

 not well defined, the lateral walls better defined ; frontal area 

 irregularly granular, vertex and orbits smooth; postocellar line 

 subequal with the ocellocular line; postocellar furrow well 

 defined, slightly longer than the postocellar line, the lateral 

 furrows poorly defined; mesonotum with distinct, well separated 

 punctures; scutellum polished, impunctate ; scutellar appendage 

 dull; venation normal; stigma rounded on the lower margin, 

 broader slightly basad of middle; sheath narrow, apex rounded. 

 Black: clypeus, labrum, mandibles (apices piceous), supraclypeal 

 area, prothorax, tegulae, upper part of mesopleurae, legs, 

 except dusky posterior tarsi, abdomen, margins of mesonotum and 

 scutellum pale yellow; upper part of orbits reddish-brown. Wings 

 hyaline, iridescent; venation including the stigma dark brown. 



Type locality : Gemert, Holland. Bred from cocoons sent 

 to Dr. L. 0. Howard. The material was received July 17, 1908, 

 and was found to be parasitized by a Tachinid which 

 Mr. Obquillett has determined as Ptychomyia selecta Meigen. 

 Type : Cat. No. 13128 U. 8. N. M. 



S. A. Rohwer, Washington, L). G. 



