HYMENOPTERA OF SARAWAK. 123 



yellow above. Wings hyaline, the nervures and stigma black ; 

 the 4th abscissa of the radius distinctly longer than the 3rd ? . 



Length 13 mm. 



Bidi, December. Kuching, October (Shelf ord). 



Flagellum of antennae fuscous below. Pubescence on the 

 front and eye incision pale golden. Apex of mesonotum finely 

 closely, longitudinally striated ; the basal half of metanotum, 

 on eitherside of the furrow, more strongly, obliquely striated. 

 Pleural furrows weakly crenulated. Abdominal petiole as in 

 I. nigrifrons. The 2nd and 3rd transverse cubital nervures are 

 straight and parallel. 



Allied to I. nigrifrons and I. nigricans. These 3 species 

 may be separated thus : — 



a. Clypeus yellow, with a broad black mark on the 

 top, the yellow marks on the pleurae large ... Qlypealis. 



b. Clypeus black, the marks on the pleurae small. 

 Pleurae black, mesonotum and abdomen immaculate, metano- 

 tum longitudinally striated Nigricans, Cam. 



Pleurae for the greater part rufous, mesonotum and 

 abdomen maculate with yellow, metanotum transversely 

 striated Nigrifrons, Sm. 



A. Soc, No. 46, 1906 



