218 SEEEICOENIA. 



In consequence of the great increase of the number of the Central- American species, 

 from six to fifteen, and the close resemblance between many of them, the following Table 

 has been prepared in order to give greater prominence to the essential characters : — 



Antennal grooves narrow^ equal in width for their entire length. 



Prosternal sutures simple 2. 



Prosternal sutures deeply grooved 7. 



Antennal grooves wide, much broader posteriorly 10. 



2. Interocular ridge entire 3. 



lnterocular ridge interrupted at the middle 9. 



3. Clypeus not cariniform at the base nor carinate 4. 



Clypeus cariniform at least at the base 8. 



4. Pubescence of the elytra uniform in colour. 



Black, slightly shining, sculpture not rugose, pubescence beneath 

 inconspicuous; posterior edge of the propleural triangle 



much shorter than the inner mcerens. 



Pubescence cinereous and conspicuous, sculpture rough and sub- 

 granular ; posterior edge of the propleural triangle equal to 



the inner senilis. 



Pubescence of the elytra not uniform, sometimes forming a design . 5. 



5. Head with a slight frontal carina cinerascens. 



Front not carinate 6. 



6. Thorax at the middle of the base elevated in a slight longitudinal 



carina tristis. 



Thorax at the middle near the base longitudinally impressed . . . properus. 

 Thorax neither carinate nor impressed. 



Elytra simply cinereo-pubescent for a short space at the base and 



apex only sallai. 



Elytra cinereo-pubescent at the base and apex, also along the 



suture from the base variegatus. 



Elytra narrowly cinereo-pubescent at the base and apex, a narrow 



transverse median band connected along the suture with the 



base ornatulus. 



7. Elytra broadly cinereo-pubescent at the base and apex .... tripartitus. 



8. Clypeus carinate for at least half its length ; elytra striate, surface 



subopaque and somewhat granular dilutipes. 



Clypeus carinate at the base only; elytra not striate, surface 



shining pusio. 



9. Interocular carina not or very feebly elevated, not extending down- 



ward on the clypeus. 

 Thorax densely punctate and opaque ; elytra with a narrow 



sutural and marginal line of cinereous pubescence . . . suturalis 

 Thorax not closely punctate, shining; elytra slightly cinereo- 

 pubescent at the base vanus. 



