BY THOMAS G. SLOAN E. 611 



I offer the following tabular view of the species to replace my 

 former table, which was wanting in exactness, and otherwise 

 unsatisfactory. In such closely allied forms it is often difficult 

 to find differentiating characters suitable for a table; therefore 

 some of those now suggested may appear trivial, but they are 

 believed to be constant and worthy of attention : — 



Tahh of Species. 



A. Elytral sculpture abnormal, only three deep strire on disc of each elytron; 

 interstice between first and second striae very wide, nearly twice as wide 



as interstice on each side of it.. S. svkaius, Macl. 



\A. Elytra striate normally. 



B. Prothorax with lateral basal impressions not forming a rounded con- 

 cavity inclosed posteriorly by the lateral border, 

 c. Prothorax with lateral border explanate ; prosternum with anterior 

 margin not bordered; mesosternum with intercoxal declivity deeply 

 concave; elytra with crenulate striffi, interstices equal, third uni- 



punctate near apex >S'. blackhurni, SI. 



cc. Prothorax with lateral border narrow ; prosternum with anterior 

 margin bordered; mesosternum with intercoxal declivity hardly at 

 all concave; elytra simply striate; third, fifth, and seventh inter 



stices much wider than others, third tripunctate S. impar, SI. 



BB. Prothorax with a deep concavity on each side of base inclosed behind 

 by the widely explanate lateral border. 

 D. Form stout; posterior tarsi with penultimate joint small, triangular, 

 e. Mesosternal and metasternal episterna impunctate. 



f. Elytra with sixth and seventh interstices coalescing at base and 



forming a humeral elevation S. cyaneocivctns, Chaud. 



ff. Elytra without posthumeral elevation. 



g. Dorsal strise simple S. auhei, Casteln. 



gg. Dorsal striae crenulate. 



h. Elytra with lateral apical sinuosities obsolete 



S. dlscopunctatus, Chaud. 



hh. Elytra with apical sinuosities well developed. 



i. Elytra with interstices 1-7 strongly convex, particularly 



posteriorly S. coradgeri, SI. 



ii. Elytra with interstices lightly convex, hardly or not at all 



convex above apical declivity. 



j. Prothorax with sides roundly ampliate, border explanate 



before basal foveoe ; elytra with seventh interstice 



feebly impressed S. o^esw/«s, Chaud. 



