AMERICAN COLEOPTERA. 121 



view, so that as we proceed from commixtiis to andifer the species 

 become hirger and may be assumed to be more perfect representatives 

 of the genus, they are as follows : 

 Thorax densely punctured, elytra with densely placed coarse deep punc- 



*'«»'es 10. coiuiuixtiis Ilald. 



Thorax not densely punctured, elytral punctures not closely placed, often 

 inconspicuous or concealed. 



Legs hairy, antennae slightly pilose beneath 9. albidus Lee. 



Legs not hairj', antennae not pilose. 

 Surface of thorax not tuberculate, even, punctures regularly placed. 

 Elytra very indistinctly punctured especially at apex, the disc with 

 angulate fascia behind the middle, the apices feebly obliquely 



truncate 8. biustus Lee. 



Elytra distinctly punctured over the entire surface, disc with acutely 

 angulated fascia, apices slightly prolonged not obliquely 



ti'uucate 7. parvus Lee 



Elytra more distinctly punctured near the apex than at base, apices 

 , very obliquely truncate, disc with arcuate fascia at the 



declivity 6. arciiatus Leo, 



Surface of thorax more or less tuberculate and with the punctures 



irregularly placed and sparse. 



Elytra feebly or not roughened with acute tubercles, antennee in both 



sexes longer than the body, the joints three and four together 



not longer than 5—7 taken together. 



Tips of elytra not prolonged, apices separately rounded, thorax with 



rather strong diseal tubercles 5. iiebulosus n. sp. 



Tips of elytra obliquely prolonged, apices obliquely truncate, thorax 

 with very flat tubercles. 

 Elytra without rows of tubercles, a few only near the base, post- 

 humeral oblique impression very feeble. Hind trochanterg 



of % slightly acutely prolonged 4. plauidorsus Lee. 



Elytra with four distinct diseal series of obtuse tubercles, post- 

 humeral oblique impression well marked. Hind trochanters 

 of 'J, not prolonged. 

 Thorax irregular but without denuded spaces or lines. 



3. terrtecolor n. sp. 

 Thorax with median fine carina denuded at apex, a short oblique 

 line on each side at apical margin, often denuded. 



2. argcntatus Duval. 



Elytra with asperities well marked, either as acute tubercles or ridges; 



antennffi scarcely longer than the body even in the male,joints 



three and four together equal in length to 5—8 together. 



Hind trochanters of -J, prolonged into a short but acute spine. 



1. aculifer Say. 



li. parvus Lee, New Species, 1873, p. 234.— Antennaj in both sexes longer 

 than the body, joints 3—4 together about equal to the following three. Thorax 

 subangulate behind the middle, the sides oblique in front, the apex slightly 

 constricted, surface moderately densely punctured, with faint evidences of flat 

 tubercles which are also punctured. Elytra moderately coarsely punctured 



TBAN-S. AMER. EST. SOC. VIII. (16) APRIL, ISSQ. 



