34 Cameron, Hymenoptera Orientalia. 



incline to rufous. Wings clear hyaline, the stigma 

 and nervures fuscous ; the apical abscissa of the radius 

 straight, oblique ; the appendicular cellule incomplete 

 at the apex. Abdomen nearly as long as the head 

 and thorax united ; the petiole slightly longer than 

 the second segment, narrowed at the base, gradually 

 widened towards the apex ; the apical segments thickly 

 covered with a white pubescence ; the pygidial area 

 smooth, except for a double row of five large, round 

 punctures down the outer side of the centre ; the sides 

 keeled ; the ventral segments shining, the apices of the 

 segments pale piceous ; the apical half of the hypopygium 

 punctured. 



Note. — I have stated above that only one Ceylonese species 

 of Crabro is recorded by Col. Bingham in his Manual ; but 

 he has omitted from that work all mention of Dasyprodus 

 ceylonicus Saussure, described from Ceylon in the Reise der 

 Novara ; Hyme^t. p. 8^, pi. iv. f. jz. Dasyproctiis is a Crabro 

 with a very long, narrow petiole, not dilated towards the apex, 

 as it is in Rhopalum. It is regarded by Kohl in his generic 

 revision as a section of Crabro only. 



Crabro revelatus, sp. nov. 



Long, to apex of petiole 6 mm. (in C. taprobance it is 

 7 mm.). 



Hab. Trincomali, Ceylon ( Yerbury). 



Comes near to C. taprobancE, and, like that species, 

 has an elongate petiole, but here it is more slender; it 

 differs further in the post-scutellum being coarsely longi- 

 tudinally striated ; in the vertex at the edge of the frontal 

 depression being distinctly margined ; and in the furrow 

 on the middle of the apex of the median segment being 

 wider. 



Scape of antennae lemon-yellow, shining, glabrous; 

 the flagellum black, sparsely covered with a pale down ; 

 the second joint yellow beneath ; the third only very little 



