HHYSODES. 



503 



Key to the Genera. 



1. Eyes lateral, rounded, never elongate, 

 usually but not always large, dis- 

 tinctly granulated, lower margin of 



their orbit not visible from above . . Rhysodes, Dalm., p. 503. 

 II. Eyes superior, elongate, or absent, 

 scarcely granulated ; if they are pre- 

 sent the lower margin of the orbit is 



visible from above Clinidium, Kirby, p. 511. 



Genus RHYSODES. 

 Rhysodes, Dalman, Analect. Ent. 1823, p. 93. 

 Type, Cucujus sidcatus, F. 



This genus appears chiefly to differ from Clinidium in the 

 shape of the eyes, which are lateral and more or less rounded ; as 

 a rule they are large, but in B. dohertyi, the single species be- 

 longing to the subgenus Shyrodes, Grouv., they are small and 

 projecting. 



For the following table I am chiefly indebted to the work of 

 M. G-rouvelle (Ann. Soc. Ent. France, lxxvii, 1908, p. 320, and 

 Eev. cl'Ent, xxii, 1903, pp. 90-104). 



Key to the Species. 



I. Eyes large, not projecting, central space on 

 the head not separating the frontal lobes 

 (subgen. Omoglymmius, Gangl.). 



i. Lateral furrow of the pronotum incomplete. 



1. Interstices of the elytra flat, evidently 



broader than the striae ; lateral fur- 

 rows extending for more than three- 

 quarters of the length of the pronotum. arrowi, Grouv., p. 504. 



2. Interstices of the elytra, on their disc, 



convex, scarcely broader than the 

 strise ; lateral furrows scarcely attain- 

 ing the middle of the pronotum .... 



ii. Lateral furrows of the pronotum complete. 



1. Frontal lobes emarginate on their inner 



side in a semicircle, forming on the 

 front a deep, somewhat circular, im- 

 pression, narrowly open anteriorly . . 



2. Frontal lobes emarginate on their inner 



side, forming on the front an excava- 

 tion broadly open anteriorly. 



A. External furrows of the pronotum 



five or six times as broad, even at 

 their apices, as the internal furrows. 



B. External furrows of the pronotum 



either equal in breadth to, or much 

 less than five or six times as broad 

 as, the internal furrows, 

 a. Interstices of the elytra carinate, 



the alternate ones being more 



distinctly raised 



boy si, Arrow, p. 505. 



aterrimns, Chevr., 



[p. 505. 



taprobance, Fairm., 



[p. 506. 



[p. 507, 

 crenatus, Grouv., 



