4 



CIIItYSOMELIN^. 



the remainder, the former being generally smooth, shining and 

 less hairy, while the latter are usually thickened, opaque and 

 more hairy ; terminal segment always more or less pointed ; the 

 differences in the relative lengths of the basal segments are of 

 some taxonomic value; labrum strongly chitinized, usually broader 

 than long, with its anterior edge generally emarginate and 

 usually set with stiff hairs or bristles ; mandibles distinct and 

 prominent; maxillary palpi four-segmented; labial palpi three- 

 segmented. Thorax : pronotum more or less quadrate, generally 

 broader than long and bearing setse at the anterior and posterior 

 angles ; scutellum usually triangular ; elytra usually bearing 

 longitudinal series of punctures, but often the punctures are 

 quite confused or with only a tendency to seriate arrangement; 

 epipleura (fig. 2) of the elytra (?. e. the broadening of the lateral 

 margins seen in ventral view) either of the same breadth from 



Fig. 3. — Chrsyolina exctnihematica, Wied.: — a, dorsal view of head; ventral 

 view of head ; c, antenna: /tf. = labrum, /. = labium, l.p. =labi<xl palp, 

 md. = mandible, wa\^. = maxillary palp. 



base to apex, or more oflen narrowing towards the apex, with 

 surface usually convex, lying in a horizontal or vertical plane, 

 in some genera furnished along the inner margin with a row of 

 cilia-like bristles (fig. 15 B, p. 46) ; hind wings membranous, fully 

 developed, or in some cases absent: prosternum aiul mesosternum 

 presenting differences in the form and structure which have been 

 used for classificatory purposes ; metasternum large and more or 

 less convex ; anterior coxal cavities either open behind (fig. 2) or 

 closed behind by a lateral outward prolongation of the posterior 

 end of the prosternum, which meets or closely approaches (but 

 does not fuse with) the inward prolongation of the side-piece of 

 the underside of the pronotum (cf. fig. 52) ; tarsi four-segmented, 

 third segment bilobed or deeply notched *, fourth segment 



* In all the genera known from the countries under review, the lobes of the 

 third segment are fused, except in Plagiodera, Phaedon, Agasta and Chrysomela 

 [Melanoma], where the segment is split longitudinally along the middle. 



