40 LUCANlD^i;. 



Striking series of figures representing the variation of the male 

 sedeagiis within a single species (Pachyrrhinadoretus rugipennis) 

 have been j^ubhshed by myself in Plate V of the volume on 

 RuTELix.i:, etc., of tliis series. Similar variation in the 

 common European Rose-beetle {Cetonia aumta) has been 

 illustrated hy Curti (Entom. Mitth. vol. ii, 1913). and Cazier 

 has more recently shown the same in a North American 

 Melolonthid, Phobetus comatus (Pomona Coll. Journ. Ent. 

 1937, pi. 2). 



Key to the Subfamilies of Lucanid^. 



1 (6) Tarsi normal, flexible, 5-jointed. 



2 (5) Front coxae not protruding ; 2nd joint of 



the labial palpus relatively short. 



3 (4) Scutelliun broad, obtuse-angled ; pul- 



villus well developed ; maxillary hook 

 absent in the male, usually present in 

 the female Luc.vnix.s, p. 40. 



4 (3) Scutellum absent or narrow and acute- 



angled ; pulvillus invi5.ible ; maxilla 

 with strong cliitinous hook in male 

 and female Figulin.1:, p. 212. 



5 (2) Front coxae protruding ; 2nd joint of the 



labial palpus very long ^SAUX^i:, p. 229. 



6 (1) Tarsi soHd, short and thick PENiCHKOLrcAxix^, 



[p. 233. 



Subfamily LucANrs'^. 



Male and female more or less dissimilar. 



Legs of normal form, generally more slender in the male, the 

 front coxae not promment, the tarsi slender, claws long and 

 pulvillus well developed. Scutellum transverse, its apex 

 obtuse. ^laxill* without chitmous hook, except in some 

 females. Labial palpi with the 1st joint long and the 2nd 

 short. 



This subfamily includes the great majority of all the 

 LrcAXiD-i: and all those of large size, in which the two sexes 

 differ in a striking degree ; but together with these liighly 

 developed forms are fomid, m each of the large genera, smaller 

 species in which the male features are only poorly developed 

 and the two sexes not verv dissimilar. 



Key to the Genera of Lucanin^. 



(lU) Eyes not completely divided. 

 (3) Middle tibiae always and hind tibiae 



usually bearing two or more lateral 



spines Lvc.\NVS, p. 41. 



(2) Fo'ir posterior tibiae with not more 



than one lateral spine each. 

 (5) Front tibia at the end simple, not 



forked or divided Cyclommatus. p. 63. 



