Genera and Species of Hymenoptera. 531 



Rhynchium clypealum, sp. n. 



Nigrum, dense argenteo-pilosum, basi medioque cljpei albo ; alis 



violaceis. cJ . 

 Long. 14 mm. 



Hob. Barrackpore, Bengal (Rothney). 



Antennae black, the flagellum slightly brownish beneath ; 

 the claw brownish, stout. Head strongly and closely punc- 

 tured, thickly (especially on the face and outer lower orbits) 

 covered with silvery pubescence. Clypeus large, its greatest 

 width as long as its length, its base broadly rounded, its apex 

 roundly incised, the sides forming triangular teeth; its upper 

 third, and the lower half broadly in the centre, yellow, the 

 apical yellow mark being separated from the basal yellow 

 part; the edges of the black separation are irregular; the 

 inner orbits opposite the antennse are yellow. Thorax ru- 

 gosely punctured, covered with a silvery pile; the lower part 

 of the propleurse bear four stout clearly separated keels. The 

 base of the mesopleurse is smooth; in the middle is a longi- 

 tudinal furrow ; above this the punctures are somewhat more 

 widely separated ; the lower part of the apex 13 smooth. 

 The upper part of the metapleurge above the hollow is longi- 

 tudinally striated ; the lower part is smooth and impunctate ; 

 the upper part of the apex is strongly but not closely punc- 

 tured ; the lower partis smooth. The sides of the median 

 segment are broadly rounded above and have no teeth. 

 Wings violaceous, the anterior pair deeper in tint than the 

 posterior ; the second cubital cellule is much narrowed at the 

 top, about one sixth of the length of the third and about half 

 the length of the space bounded by the first transverse cubital 

 and the recurrent nervures. Abdomen thickly covered with 

 silvery pubescence, sparsely punctured ; the ventral surface 

 with the punctures stronger and closer. 



Comes nearest to R.argentatum, Fabr. (sec. Saussure, Stett. 

 ent. Zeit. xxiii. p. 187 , = metollicum, Sauss. Etudes, i. 114), 

 but is larger, has the clypeus broader compared to its length, 

 more rounded on the top, and yellow in the middle at the 

 apex ; the thorax is less strongly punctured ; the sides of the 

 median segment bulge out more and the apex is more exca- 

 vated therefore in the middle ; the third cubital cellule is of 

 nearly equal width at the top and bottom, while in R. argen- 

 tatum it is distinctly wider at the top than at the bottom, and 

 the hind wings are not so clearly hyaline compared with the 

 anterior. 



R. argentatum, Bingham (' Fauna of India,' Ilym. i. 



