130 REMARKS UPON CORYPHOCERA-SPECIES. 



prolongation of the reflexed front margin of the head 

 looks less pointed, somewhat more truncated than in the 

 Busuanga type. But on the other hand comparing the 

 mentioned specimens with versicolor, the only peculiarities 

 I am able to enumerate for the latter are the still more 

 obsolete sculpture of the elytra , the broader and slightly 

 emarginate frontal process , the brown colour of the anten- 

 nae, the almost entire absence of black on the margins 

 of the abdominal segments as also on the male ventral 

 depression, and finally, the somewhat different shape of 

 the black spots on the uppersurface. 



Although the differences here recorded may look quite 

 sufficient to differentiate both species conveniently, I feel 

 almost sure the examination of a more extensive material 

 (and if it may be from a still greater number of localities) 

 will prove that we have to deal with local races of one 

 and the same species. Even when taking material from 

 a single locality , Coryphoceras frequently vary both 

 in coloration and in sculpture , and very little strength 

 may be laid on characteristics derived therefrom. The 

 structure of the head and chiefly of the reflexed frontmargin 

 of the clypeus , which I myself was inclined to consider a 

 sure guide, happens to be a character as perfidious as the 

 rest — among my large material of C. Dohrni Lansb. I 

 have several specimens with the frontal process entire and 

 broadly rounded instead of bilobed. 



I thought it of interest at once to draw the attention 

 to these Philippine species , which seem to indicate a series 

 of local forms exactly like decora 111. , imperatrix Mohn. 

 and Dohrni Lansb. It is worthy of notice that G. imperatrix 

 Mohn. is confined (at least as far as present knowledge 

 goes) to East- Java, whilst in West-Java an other form 

 occurs, which very strongly resembles the Sumatran 

 C. decora 111., only differing from it by the somewhat 

 larger black spots and the more evidently punctured elytra. 



It is to be regretted that Dr. Heller repeats the blunder 

 made by Dr. Kraatz concerning the synonymy of C. impe- 



Notes from the Leyden ]Museum, Vol. XVII. 



