30 G. H. BORN, M. D. 



rery much narrowed at the anterior extremity. The intercoxal pro- 

 cess is short and very broad, and the antennre are ten-jointed, the 

 eleventh joint being small and conical and connate with the tenth, 

 and finally the lateral lobes of the front are large, triangular, acute 

 and very prominent laterally. The genus must obviously constitute a 

 distinct tribe nearer the EpipJv/aini than Gnafhosiini, defined by the 

 characters above noted ; it caonot, as suggested by Lacordaire, be as- 

 sociated with Meijagenms, as this has the metastemal episterna nar- 

 rower. 



With Craniotus removed the tribe becomes more homogeneous. It 

 may be observed, however, that while all the other genera have the 

 mandibles gi-ooved above so as to permit them, when closed, to clasp 

 the middle lobe of the epistoraa and thus completeli/ conceal the lab- 

 rum (without becoming themselves concealed when viewed from 

 above), Anchmoblas has the mandibles feebly grooved not clasping 

 the middle lobe of the epistoma, when in repose, allowing the labrum 

 to be partially visible, while they are completely invisible from above. 

 It is also the only genus without supra-orbital ridge, and has the outer 

 joints ot tl»e antennae compressed, broader than long and trapezoidal 

 in f trm. It might possibly represent another tribe, the form of the 

 antennae being totally unlike that of any other genus in the earlier 

 groups. 



Tlij tribe thus becomes reduced to four genera, the relations of 

 which are as follows : — 



Intercoxal process of abdomen broad, feebly narrowed in front, tip subtruncate 

 or rounded. 

 Tarsi spinous beneath. Hind tarsi with joint 1 equal to 3, 4. 



Middle lobe of epistoma narrowed at base and clasped by a tooth-like pro- 

 cess from the base of the mandibles Triorophus. 



Middle lobe of epistoma triangular, rapidly narrowed in front, mandibles 



without basal tooth Stibia. 



Tarsi with silken hairs beneath. Hind tarsi with joint I equal to joint 4 

 only. 

 Middle lobe of epistoma uarrower in front, mandibles without basal tooth, 



thorax narrower in front Triphalus. 



Intercoxal process of abdomen triangular, either acute or oval at tip. Tarsi 

 spinous beneath. 

 Middle lobe of epistoma narrower in front, either oval or truncate. .. Trim ytis. 



The above genera all have the prothorax coarsely punctured be- 

 neath and the metasternum very coarsely and deeply cribrate, a cha- 

 racter entirely unknown elsewhere among our G nathosiini. In Trioro- 

 jihus it will be seen that certain specimens are stouter in form, the 



