26 -REVISION OF THE AMYCTERIDES, \-i., 



fall into this section. In the second section, the head is separated from the ros- 

 trum by a transvei-se impression ; the prothorax is subtruncate above, and ocular 

 lobes are absent. In these eharactei's the second section agrees with the genus 

 ('ubicorrhi/nckus, and with good reason might l)e united to that genus; the species, 

 however, in their general facies, much more closely resemble Acantholophus, and 

 the rostrum is deeply excavate. Probably this section will require a new generic 

 name. 



The membci-s of the tiret section may 1k' divided further into tubcrculatc and 

 spinose foniis; this differentiation is not a good one as. after all, it is more or 

 less a question of degree, but the di\'ision sei-ves to separate two large groups of 

 species, the members of each of which are more or less closely allied inter se. 

 I have taken the character of the lateral prothoraeic tubercles as determining 

 Avhether a species belongs to the tuberoulate or spinose subsection. In one or two 

 ca-ses it is difficult to interpret this feature, but most of the doubtful species are 

 evidently related to other species belonging to one or other of these two sub- 

 sections. In the tubereulate forms the sul)median rows of prothoraeic tubercles 

 are never in single series, but always have the intermediate tubercles irregularly 

 set (exserted). In the spinose subsection these submedian tubercles are generally 

 in single series, but may be exserted. Further subdivision into groups is a matter 

 of great difficulty, principally owing to th«? occurrence of so many isolated 

 species, each more or less requiring a group to itself. Certain natural groups do 

 occur, and in the table of species T have indicated such groups by the group 

 name in brackets after the character which immediately governs the group. 

 Such group names have only been made use of in the tubereulate subsection. 



Table of Species. 



Section I. — Rostrum divided from head above by an intercristal ridge. Apical 

 margin of prothorax slightly produced above head, with ocular lobes. 



1 (54) Lateral prothoraeic tubercles flattened, trianguhform. [Submedian row 



of tubercles on prothorax not in single series]. ( Tubereulate specxts) . 



2 (11) With the following characters in combination: Supraorbital crests 



simple; intermediate tibiae notched (diiinosus group). 



3 (6) Intercristal ridge well developed. 



4 (.5) Intermediate ventral segments strongly strigose; subapical elytra! spines 



absent or mere spicules du»wsus Bohem. 



5 (4) Intermediate segments not strigose; subapical spines well marked. 



apical is Macl. 



6 (3) Intercristal ridge obsolete or but little developed. 



7 (10) Prothoraeic tubercles depressed, flattened. 



8 (9) Form normal; tubercles few and large Iraiisilus ^'acl. 



9 (8) Form very elongate; tubercles more numerous and smaller. liroicniV erg. 

 16 (7) Prothoraeic tubercles erect, conical ai>iycteroides Macl. 



11 (2) Without the combination of characters as in duiiiosus group. 



12 (49) Apical tubercle of second elytral row on a level with, or posterior to 



apical tubercle of first row. 



13 (42) Apical ventral segment more or less flattened. 



14 (39) Supraorbital crests arising from a comparatively firoad base. 



(}iiarshaiiii group) . 



15 (34) Crests more or less distinctly liranched. 



16 (33) Crests distinctly biramate. 



17 (20) Posterior tarsi with first joint short and broad. 



18 (19) Intermediate tibiae simplg i)tar$hatni Kirby. 



19 (18) Intermediate tibiae notched sella/us, n.sp. 



