PSEN SUMA.TRANUS, 225 



NOTE XXXIV. 



ON TWO NEAV EXOTIC SPECIES OE lOSSORIAL 

 HYMENOPTERA. 



BY 



C. RITSEMA Cz. 



1. Psen Sumatranus, sp. n. 9* 



Length 10 mm.; alar expanse 15 mm. — The head 

 black , shining and impunctate , thinly covered with whit- 

 ish hairs , more densely covered with silvery hairs on the 

 clypeus ; a sharp carina" between the antennae ; the scape 

 of the antennae, the palpi and the mandibles yellowish, 

 the latter with brown tips; the flagellum of the antennae 

 black above, pale ferrugineous beneath. 



The thorax black , covered with rather long erect whitish 

 hairs ; the mesothorax shining and nearly impunctate ; the 

 metathorax clathrate-rugose , with a deep longitudinal furrow 

 across the middle , and at both sides of this furrow, a little 

 behind the postscutellum , a very glossy and impunctate space. 

 The tegulae pale ferrugineous , and a small spot before the 

 base of the wings pale yellow. The wings hyaline and 

 beautifully iridescent, the stigma and uervures dark brown. 

 The second submarginal cell does not receive the first re- 

 current nervure , this nervure joining the cubital one a 

 little before the apex of the first submarginal cell. The 

 legs thinly covered with erect hairs; the anterior and in- 

 termediate pair pale yellow , with exception of the coxae 



Notes from the Leyden Museum, "Vol. II. 



16 



