1918. J I'". II- CJravkly : Passalida*' of Ihe World. 103 



The ;il)<>v('-monti»>iied sjx'cies of Mastochilus may be grouped into four sub-genera as 

 indicated alxivo (pp. !»7-!t8), and may be distiiigiiishcd from one another thus : — 



I. Sub-p-nus PHAROCHILUS, Kuup. 

 The median part of tlic inentuin witli at iinj.<t two or three 



punctures . . . • • • • • • • • • 2. 



J The median part of the meutum strongly punctured through- 

 out . . . . • ■ . . M. jixndiger, p. 99. 



The lateral lobes of the mentum with a more or less narrow 



matt border on the outer side • . • . • • ■ • 3. 



The lateral lobes of the mentum broadly matt on the outer 



side . . . . • • •• . . M. folidis, p. 99. 



f The ridges of the elytra obsolete in the extreme posterior angles M. dihOilus, p. 98. 



j The ridges of the elytra normal .. .. M. nilidulus.p. 98. 



II. Sub-genus MASTOCHILUS, -. str. 

 The frontal area small, almost equilaterally triangidar, raised 



above the general surface of the head . . . . M. qnaestionis, p. 100. 



The frontal area not raised above the general surface of the head, 

 usually much broader than long . . . . . • 2. 



The secondary scars very variable in development ; when 

 present always extending inwards from the ends of the 

 anterior margin of the median part of the mentum . . M. auslndasicus, p. 100. 



The secondary scars always developed as a pair of fine grooves 

 deiining a small and more or less equilaterally triangular 

 shield in the middle of the anterior margin . . M. polyphyllus, p. 100. 



III. Sub-genus ANALACHES, Kuwert. 

 The lateral grooves of the elytra much broader than the ridges 



between them ; the transverse ridges between their enlarged 



matt punctures more or less obsolete . . M. australiensis, p. 101. 



The lateral grooves of the el\-tra narrow and strongly punc- 

 tured .. .. .. .. .. M. /;i<6pr;7?«, p. 101. 



IV. Sub-genus CETEJUS, Kaup. 

 The left outer tubercle pointed, directed forwards or a little 



outwards . . • • • • • ■ 2. 



The left outer tubercle tnincate, directed inwards . . . . ,1/. pellostirtw. p. 102. 



The .secondarv scars on the mentum represented by a more or 



less broken transverse groove a little behind the anterior 



margin . . . . . . M. (jrohou.'ikii. p. 102. 



The groove formed by the secondary scars on the mentum deep 



and unbroken . . .M . tcxlalis, p. 102. 



Cnuis LABIENUS, Kaup, 1S71, p. ;,9. 



Incl. Aurelius. Kuwert, 1896 ; Hyjyerplesllieuiis, Kuwert, 1898 ; Kaupioloides, Gravely, 

 1913 ; Kaupiolm, Zang, 19036 {=Vellrjii.<i. Kaup. 1S71, preoccupied). 

 Tv])o. A'/•(r)r/*f'w^s■ plo.r. Kau]\ i868rr, p. 25. 



