32 



In front it meets its fellow mandible, after the manner of pincers. This may be 

 regarded as the tyiiical form among the Corylophiche ; it attains its utmost develop- 

 ment in Coriilii]>lii>ilix, and seems to indicate that their food would consist in soft 

 decaying vegettible matter. 



In lilii/pobiits and several other genera the mandible assumes a totally diflferent 

 shape. It is very long iiud slender, armed at its extremity with hooks ; it is 

 attnihed to the stipes much in the same way as the Saciinu, but the stipes itself is 

 free and folded baeii within the mouth, so that it appears capable of extruding the 

 mandible considcralily in front of the head. 



In Pdliniix and Orl)i(>}n-riis the form of the mandible approaches more closely 

 the carnivorous type. 



The CorjilophiiUe thus constituted may be divided into five tribes, distinguished 

 from each other by the following characters : — 



/Mk/ exposed Phanerocephalina. 



,, concealed, or nearly concealed, by the pronotimi. 

 iVn.i77Z</(i/ //(»/y/( with the second joint simple ... ... Saciina. 



,. ,, with the second joint strongly incrassated. 



Kli/tni triiucaie ... ... ... ... ... ... Sericoderina. 



,, entire. 

 //'</</ entirely concealed ... ... ... ... ... Corylophina. 



., partly visible Orthoperina. 



Tribe I. — Phanerocephalina. 



This tribe is simply a miscellaneous collection of genera which are elongate in 

 form, but agree in no external character except the protrusion of the head. I have 

 thought it better to class them thus together than to divide tliem into sei)arate 

 tribes, since, if this were done, each genus would require a tribe for itself. If in 

 l^rocess of time other genera should be discovered bearing athuity to either of those 

 at present knowni, a further subdivision might then be properly made. 



The genera now constituting the I'liauvrociphalimi maj" be distinguished from 

 each other by the following characters, viz. : — 



Thorax widest near the middle .ffinigmaticum. 



,, ,, at the base 



Anterior margin of the pronotum entire, head prominent ... Ectinocephalus. 



,, ,, ,, ,, deeply incised, head sessile Conodes. 



JENIGMATICUM. PI. I., A. 

 Mnigmaticuui, Matthews, Biol. L'uut.-Amer. Col. ii. pt. i. p. 101 (1887). 



Corpus elongato-ovale. 



Caput sat magnum, proniinens, totum exsertum ; ore dcHexo ; parte gulari convexa; 

 oculis magnis, valde prominentibus ; antcnnis projie oculos iusertis. 



Aniinuif (PI. I., A. iig. 7) novem-articulata, 1 pralongo, pyriformi, leviter recurvato; 

 2 raagno, prinio sat minori, elongato-ovato ; 3 et 4 perparvis, gracilibus ; 5 

 quarto longiori et crassiori ; G perparvo, 7-9 valde et gradatim incrassatis, 

 ciavani moniliformem formantihus, apicali majori, apice subtruncato. 



Palpi viaxilliircs (PI. I., A, tig. 5, w) magni, 4-artieuiati, 1 niinuto; 2 permagno, ovato, 

 turgide incrassato, antice truncate ; 3 perbrevi, transverse, secundo multum 

 angustiori ; 4 elongato, gracili, obtuse-conico, ad apicem setis instructo. 



