CICIKDELA. 



387 



I have examined a large number of C, se.vpunctata, and the 

 pubescence on the sides of the pronotum is always absent. I 

 have seen one apparently fresh specimen of G, aurovittata, with no 

 pubescence either on the pronotum or abdomen, but it probably 

 ihas been rubbed off ; the pubescence on the former is present 

 in all the other examples I have seen. 



Group 16. 



This is a very difficult group to define, and is, as here constituted, 

 made up of three groups which have been separated by Dr. Horn, 

 chiefly on the presence or absence of setae on the sides of the pro- 

 notum ; these, however, are in several cases scanty and fugitive, 

 and hence confusion has already arisen, more especially as some 

 of the species are very rare, and a series is necessary for the 

 definition of the characters depending on pubescence. The 

 G. mouhoti group with the various varieties and subspecies is 

 especially difficult, some of the species having setae present and 

 others being entirely without them. I have thought it best there- 

 fore to throw them all together and to draw up a table resting 

 chiefly on the differences in the markings, which are very constant; 

 the pubescence of the underside is more or less scanty on the 

 sides of the abdomen, and the episterna are bare, at least at the 

 sides, and usually almost entirely bare ; the genae are also bare ; 

 the species, as a rule, are parallel-sided, with the pronotum sub- 

 quadrate, and the elytra oblong with well-marked shoulders. 



I have omitted from the following table C. laurce, Gestro (p. 394), 

 which I have not seen (it appears to be near O. mouhoti, from which 

 it may be known by its longer and narrower pronotum), and C. tri- 

 toma, Schin.-Goeb. (p. 394), which I cannot identify with certainty ; 

 it is quite distinct from the C. tritoma of Gestro, which is 

 synonymous with G. goebeli, AV. Horn, which Dr. Horn now 

 regards as a subspecies of mouhoti. Dr. Horn places G. tritoma, 

 Schm.-Goeb., in a section distinguished by having no setae at the 

 sides of the pronotum, but in two specimens in the Calcutta 

 Museum labelled G. tritoma, these setae are very distinct ; these 

 ought perhaps to be referred to G. marice, and, if so, I have not 

 seen a typical C. tritoma. 



Dr. Horn has been most kind in helping me with this difficult 

 section by sending me several of his unique types, and examples 

 of rare species. 



Key to the Species. 



I. Pronotum longer than broad, sub cylindrical, 

 without setae at the sides, and with the 

 depressions in front and behind not 

 strongly marked, 

 i. Elytra with a regular yellow longitudinal 

 band extending from the base nearly to 



the apex ; form narrower ; pronotum [p. 390. 



longer hamiltoniana, Thorns., 



2c2 



