199 



Tjahial polpi (PI. VII., C, fig. 6, m) rather short, robust, three-jointed; 1 very 



minute ; 2 turgidly incrassate, excavated at the extremity ; 3 rather shorter 



aud more slender than the second, cultriform, with the inner side straight. 

 Lahrum (PI. VII., C, fig. 3, z) moderate, transverse, emarginate in front, and dilated 



and rounded at the sides. Ejnstoma or ch/jwus (fig. u) very large, rather 



deeply punctured, with the interstices smooth and very shining, emarginate in 



front, and broadly dilated at the sides. 

 Mandibles (PI. VII., C, fig. 4) large and strong, deeply bifid and acutely hooked at 



the apex, broadly dilated at the base, and furnished on the inner side with a 



broad coriaceous process serrate at the edge. 

 Maxilhe (PI. VII., C, fig. 5) robust, three-lobed, with the exterior lobe (an elongate 



process of the stipes) rather large, cultriform ; the intermediate large and 



long, densely furnished at the apex with long setse ; the interior lobe moderate, 



obliquely excavated, and furnished with very long incurved setse at the apex. 



Stipes large and robust. 

 Meiitum (PI. VII., C, fig. 6, j) suboblong, transverse, dilated at the base. 

 Labium (PI. VII., C, fig. 6, k) rather large, quadrate, with broad lateral costae, 



anterior margin produced into a sharp point in the middle, and furnished at 



the sides with articulated paraglossa^ incurved and furnished with setie at the 



apex. 

 Lingua (PI. VII., C, fig. 6, 1) very large and broad, extending beyond the palpi. 

 Pronotum small, almost circularly rounded in front, but elevated and faintly 



concave in the middle, posterior angles not produced. 

 Scutellum moderate, triangular. 



Elytra entire, large and inflated, with the epipleural folds very broad. 

 Wings ample, long, widest at the base, the basal half strengthened with two strong 



costal nerves, one thin medial nerve, and a short angulated nerve at the base ; 



the apical half with two diverging medial nerves proceeding from the costal 



nerves, and angulated at their base. 

 Abdomen composed of nine indistinct segments, of which the apical alone is 



corneous and deeply sulcate on the disc ; the other segments are membranaceous. 

 Prothorax (PL VII., C, fig. 2, a) rather large, with the prosternum large, posteriorly 



emarginate, and widely divaricated, enclosing the greater jjart of the coxal 



cavities ; episterna minute, and very indistinct ; epimera small, distinct ; coxal 



cavities rounded, and rather widely distant. 

 Pectus with the mesosternum (PL VII., C, fig. 2, d) short and broad ; episterna 



deflesed and inconspicuous ; epimera excessively large, extending round the 



whole outer side of the coxal cavities ; coxal cavities rounded, and very widely 



distant. 

 metasternum (PL VII., C, fig. 2, g) transverse, very broad, extending to the sides 



of the body, posterior margin slightly rounded between the coxje ; episterna 



and epimera very narrow, coriaceous, almost rudimentary, entirely concealed 



by the elytra. 

 Venter composed of six segments, the first long and large, the rest much shorter, 



equal to each other in length, and the apical entire. 

 Legs (interior with the trochanters acutely conical ; femora robust, simple ; tibiae 



simple, slightly dilated at the apex ; tarsi three-jointed, the two basal joints 



almost equal in size, deeply bifid ; apical joint elongate and rather slender ; 



claws moderate, dentate at the base beneath. 

 intermediate and posterior like the anterior. 

 Coxte all rounded, and gradually becoming more remote. 



The same reasons which induced me to separate Pluenocephalus into a distinct 

 subfamily prevail with still greater force in the case of the present genus ; indeed, 

 the shape of the palpi is the only character in which Aphanocephalus bears any 



