I9I4- 



F. H. Gravely : An Account of the Oriental PassaUdac. 193 



/^Central tubercle present; supra-orbital tubercles and anterior pro- 

 1 longatioiis of supra-orbital ridges absent ; pronotum not drawn out 



into a bifid protuberance in front; middle lower tooth of mandible 

 2. <(? always) immoveable •• •• •• •• ■■ • • 3- 



Central tubercle absent, head smooth and concave; supra-orbital 



tubercles and anterior prolongations of supra-orbital ridges present ; 

 ^pronotum drawn out into a bifid protuberance in front . . • ■ 7- 



'Supra-orbital ridges not united to form a median tooth behind 



central tubercle . ■ • . • • • • • • ■ • ■ 4- 



Posterior ends of supra-orbital ridges curved inwards to form 



together a median tooth situated immediately behind central tubercle ; 

 ^central tubercle elongated dorsally ; mesothorax smooth . . [Caultjcr, Kaup.] 



Meututn with strong median keel ; mesosteraum strongly punctured ; 



abdominal sterna with at least a few hair-bearing punctures . . Cninaaipcf;,^ Kaup ; pp. 



204 & 267. 

 I Mentum not keeled; mesosternum at most feebly punctured; abdo- 

 l minal sterna unpunctured . . . . • • • ■ • • • • 5- 



/ Central tubercle unidentate or tridentate above .. .. [Trisforl/i ns, ' Kawevt.] 



K Central tubercle bidentate above . . • • • • ■ • • • "• 



Central tubercle never pedunculate, often without any posterior face, 



anterior face never longer than dorsal, anterior end less highly elevated Taeniocenis, Kaup ; pp. 



208 & 270. 

 Central tubercle usually pedunculate; otherwise always with dis- 

 tinct posterior face, anterior face never shorter than dorsal, anterior 

 end much more highly elevated than posterior . . . . Anliicocyclns, Kaup; pp. 



211 & 272. 

 ( Front coxae almost contiguous ; canthus extending about half way 

 across the eye; supra-orbital tubercles flattened, expanded at the 

 I apex, truncate .. .. •• •• •• .4»n7»/HS, Zang, p. 279. 



Front coxae widely separated ; canthus extending all the way across 



the eye : supra-orbital tubercles slender and pointed . . . . Cv/»f.!Voaj/«/;/.,s.Fairmaire; 



p. 279. 



The second section of the family appears to me to contain four Oriental sub- 

 families (in addition to the Tarquiniinae, see below, pp. 326-330) which may be dis- 

 tinguished thus:— 



/"Mentum without primary scars; secondary scars absent, or present 

 only as depressions or small grooves close to anterior margin ^ ; outer 

 j tubercles of head always simple . . . . • ■ • • ■ • . . 2. 



! Mentum with primary scars, except when these are replaced by 

 more or less strongly developed secondary scars'; outer tubercles of 

 l^head often complex . . . . • • • ■ • ■ ' ■ • ■ 3- 



I Since preparing this key I have examined the type of Comacupes minor. Heller, and specimens of 

 C. /omcoft's, Kuw., from Borneo. These have proved to be, in several important characters, transi- 

 tional between the genera Comacupes and Tristorthits (see below, p. 267). 



"^ I know of no really sharp distinction between these genera. The definition given here involves 

 the transference of Taeniocenis deyrollei, and with it I presume T. masiersi (I have seen specimens of 

 the latter determined by Zang, but not the original description), to the genus Aulacocyclus. These 

 species appear to me to resemble A. rosenbergii more closely than they do any species of Taeniocenis. 



3 This distinction taken by itself is not altoj?:ether a satisfactory one, for in one race of Ophrygon- 



