CHRYSOLINA. 



19 



the prothorax, always punctate, the punctures being in one or 

 two cases completely contused and finely impressed, but as a 

 rule they have a tendency towards an arrangement in rows, which 

 in many cases are paired ; sometimes the interstices are punctate 

 and sometimes they are not; when the interstitial punctures are 

 very numerous the striae are rendered unrecognizable; a short 

 scutellar and a sutural series are always observable in the forms 

 with striated elytra; in one elytron the punctures may vary in 

 size and in the intensity of their depth, the interspatial punctures 

 being generally finer. Underside generally finely punctate, each 

 puncture sometimes bearing a fine silvery hair ; epipleura of the 

 elytra broader at the base and narrower in the apical part, the 

 inner edge of which bears a row of cilia-like fine bristles, e\en if 

 these are not found all along the edge ; metasternal process bordered 

 all round by a deep furrow; anterior coxal cavities always open. 

 Legs : the claw-segment of the tarsus always projects much beyond 

 the bilobed segment, the latter being always unsplit along its 

 middle, so that consequently the apical edge of the segment is 

 always entire; claws always simple throughout. To summarize 

 the constant characters of the genus: (1) antennas separated by 

 the whole width of the head : (2) they pass at least beyond 

 the pronotum : (3) pronotum always broader than long, even if 

 only by about one half millimetre ; (4) elytra always punctate ; 



(5) metasternal processes bordered all round by a deep groove; 



(6) inner edge of epipleuron, at least towards the apex, 

 bearing a row of cilia-like fine bristles; (7) third, i.e. the bilobed, 

 tarsal segment entire, not split longitudinally along the middle ; 

 (8) claws simple throughout ; (9) anterior coxal cavities always 

 open. 



Range. World-wide. 



Key to the Species. 



1. Each etytron with five longitudinal series [p. 22. 



of round impunctate areas Ch.exanthematica,\\i\eA. } 



Elytron with no such areas 2. 



2. Elytral punctures entirely confused, with- 



out any tendency to form rows, not 



deepl}' impressed , . 3. 



Elytral punctures deeply or feebly im- 

 pressed, either arranged in rows or with 

 at least a tendency to form rows .... 4. 



3. Insect large, length JO-lO^ mm., opaque, 



with interstices between the elytral 

 punctures minutely scratched or 



reticulate Ch. indica, Jac, p. 24. 



Insect small, length 1\ nun., shining- rich 

 brown, the interstices not reticulate or [p. 25. 



minutely scratched Ch. longicornis, sp. n., 



4. The outer margin all round the elytra 



bordered with red-brown Ch. visknn. Hope, p. 23. 



The outer margin with no such border. . o. 



5. Some of the interstices between the 



elytral rows of punctures raised Ch. carinala, Jac, p. 2(3. 



