RIJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN. 229 



XV. — AID TO THE DETERMINATION OF THE DESCRIBED SPE- 

 CIES OF THE COLEOPTEROUS GENUS HELOTA Mg L„ AND 

 DESCRIPTION OF A NEW SPECIES. 



BY C. RITSEMA Cz. 



Indomalayan species. 



A Base of elytra coloured as apex. 



B Elytra with four convex fulvous spots. 



C Pronotum rugose, with raised patches. 



D Elytra very regularly punctate-striate all over. 



E Fulvous elytral spots large or moderately large. 



F The black colour at the tibiae restricted to the 

 extreme base and apex. 



G Antennae dark pitchy. Upper surface and ely- 

 tral epipleurae bright metallic green . . . Vigor si Mc L., Vigor si 



sumatrensis Rits. and Vigorsi borneensis Rits. 



G 7 Antennae pale fulvous. 



H Upper surface and elytral epipleurae metallic 



green with golden hue . . . . . . . . scintillans Olliff. 



H 7 Upper surface and elytral epipleurae dark green- 

 ish purple Pasteuri Rits. 



F 7 The black colour at the tibiae more extensive, 

 leaving only one third of the tibiae (a ring 

 in the middle) testaceous .... Rouyeri Rits. 



E' Fulvous elytral spots small. 



I Upper surface and elytral epipleurae bronze 

 coloured. 



J Sides of pronotum coloured as the disk. 



K Apical half of antennae dark pitchy. 



L Elytral interstices but slightly convex . . . Vanclepolli Rits. 



1/ Elytral interstices subcostate lugubris Rits. 



K7 Antennae entirely pale fulvous Fruhstorferi Rits, 



3 / Sides of pronotum testaceous red. 



M Apices of elytra in the Q pointed, slightly 



prolonged Feae Rits. 



M 7 Apices of elytra in the Ç conjointly rounded thoracica Rits. 



I ' Upper surface and elytral epipleurae coppery red. 



16 

 (7-X1I-1915 



