Manchester Memoirs, Vol. xliv. (1900), No. 15. 85 



four fovciL'. Securiform articulation stoutly striated, as 

 are also the furrows on the other segments. 



Agrees in coloration with B. iivibratilus Cam. which 

 may be known from it by the propleur.ne being closely 

 punctured and striated at the apex ; by the triangular base 

 of the keel on the second segment being longitudinally 

 rugose; and by the mandibles being black. 



RHOGAS (?) MANDIBULARIS, Sp. HOV. 



Nigra, vuDidibiilis, palpis pedibusqiie pallide testaceis; 

 dnnidio apicali tibiariim posticaruni nigris ; alis Jiyalinis, 

 nervis stigiitatcque iiigris- $> . 



Long. 9 mm. 



Antennae longer than the body, black, tapering 

 towards the apex ; the scape covered with long black 

 hairs ; the flagellum with a microscopic pile. Face closely, 

 transversely, rugosely striated ; the clypeus finely rugose; 

 its apex rufous. Palpi pale testaceous. Mandibles rufous; 

 the teeth black. Thorax entirely black ; the mesonotum 

 aciculated, covered with a pale microscopic down. Scu- 

 tellum finely punctured and more thickly pilose than the 

 mesonotum ; the space at the sides of the post-scutellum 

 striated. Median segment with a distinct keel down the 

 middle ; thickly covered with long white hair; the apical 

 half irregularly reticulated. Propleurae opaque, the base 

 aciculated, the rest closely and finely punctured ; the apex 

 obscurely and irregularly striated. Mesopleurai smooth 

 and shining, the upper part at the base finely rugose ; the 

 metaplcurit above obscurely, below finely and distinctly, 

 punctured. Mesosternum smooth and shining ; furrowed 

 down the middle ; its base oblique with the furrow wider 

 and shallower, and with a fine transverse keel at the apex. 

 The pleunt and sternum blotched with brown. Legs 



