56G Mr. D. Sharp and Mr. F. Muir on the Comparative 



emarginate at tip, on the ventral aspect the ring-piece projects as a 

 long strut {h). Sac large, with a slender flagellum (/</) rising from 

 the apex. 



The basal part of the median lobe being divided into 

 two pieces, and the complete ring-piece with a cap on the 

 dorsal side separate this genns from the Chrysomelinae. 

 C. tenehricosa is of the same type, but the cap-piece is 

 smaller in proportion. Hence we propose Timarchinae 

 as a distinct subfamily. As Donaciinae and Sagrinae 

 approximate this structure, the Timarchinae should be 

 placed between them and Chrysomelinae. 



Biabrotica sorm\ 



In this Galerucid the median lobe forms a long, curved tube : 

 the basal foramen extends ventrally for one-third of the length 

 of the tube : at the distal extremity there is a short acumen, 

 and the dorsal face of the tube is membranous for nearly one- 

 third of the length. The tegmen consists of a pair of slender, 

 nearly parallel and nearly contiguous rods, these diverge very 

 abruptly, and then converge again a little so as to partially embrace 

 the median lobe, but they are unconnected by chitin on the dorsal 

 aspect. 



Galerucclki spp. 



Agree with the above in respect of the tegmen ; but the basal 

 part of the median lobe is very different, the tube being more 

 complete at the base, and provided there with a pair of hooks. 

 These hooks also exist in Galeruca tunaceti and in Loclimaea. In 

 the last-mentioned genus the median lobe is of highly irregular 

 form, and instead of forming a single curve, the two extremities of 

 the organ are curved in opposite directions (as occurs less markedly 

 in Halticn). 



So far as we can form an opinion as to the Galerucinae 

 from the few forms examined, it would appear that their 

 chief characteristics are (1) the indefinite delimitation of 

 the median orifice, entirely dorsally placed and unpro- 

 tected ; and (2) the small tegmen, forming only delicate 

 rods. 



Haltica coryli. 



Median lobe straight, tubular, somewhat flattened, ventral edge 

 of mtdian orifice produced into a point, projecting beyond the 



