CORTHYLUS. 253 
Southern United States and the remainder from Tropical South America. We have 
received nine from Central America, of which all but one are new. 
As I have been so fortunate as to see the types of all described species, except 
two from North America, I have drawn up a complete table of them, with the 
exception of C. spinifer, Schwarz, which is unknown to me, and have recharacterized 
those of Ferrari, so far as necessary. 
The habits of C. punctatissimus (Zimm.) have been described by Merriam (Am. 
Nat., Jan. 1883); and those of C. columbianus, Hopk., by Hopkins (W. Va. Agric. 
Exp. Stat., Bull. 36). 
1. Forehead subconvex; antennal club small, oval or obovate. 
(Males.) 2. 6 6 wwe ee ee ee ee 
Forehead excavate or impressed, often densely pilose ; antennal 
club very large, asymmetrical, trigonate, subsecuriform or 
subreniform. (Females.) . . . 2. 2 6 6 we ew ew we TK 
2. Elytra subtruncate at apex, with two series of strong tubercles . [excisus, Ferr.] 
_ Elytral declivity with no strong tubercles . . 2. . . 2. . . 3. 
3. Apex of prothorax bituberculate . . . 2. 2 1 ee ee 
Apex of prothorax not bituberculate . . . . wo. es 610. 
4, Prothorax black or piceous, at most with apex slightly lighter . 5. 
Prothorax wholly or partly rufous or testaceous . . . . . . 7. 
5. Apical margin of elytra subtransverse . . . . . . . . . flagellifer, sp. n. 
Apical margin of elytrarounded . . . . . ..... . 6. 
6. Declivity of elytra with a shallow impressed area on each side 
of the suture: length over 4 millim. . . . . . . . . ptyocerus, sp. n. 
Declivity with a narrow striate impression on each side of the 
suture: length 3 millim. . . .. . Loe . . panamensis, sp. n. 
7. Elytra ferruginous, narrowed posteriorly, fully one- half longer 
than the prothorax . . . . . ... . . [redtenbacheri, Ferr. | 
Elytra black, the apex sometimes rufescent, less than one- half 
longer than the prothorax. . . . woe ew eee 8B 
8. Declivity of elytra rufescent, impressed along the suture . . . collaris, sp. n. 
Declivity black, not impressed . . . . . - . . 9 
9. Prothorax uniformly rufous ; declivity of elytra not tuberculate . rubricollis, sp. n. 
Prothorax infuscate in front; declivity of elytra with minute 
tubercles . . 2 6 ee eee ew we ee ew eee parvulus, sp. 1. 
10. Declivity of elytra uniformly convex . . . . . . . + « « [punctatissimus, Zimm. | 
Declivity subimpressed on each side of the suture. . . . . . Li. 
11. Ferruginous, the apex of the prothorax and elytra infuscate . . [discoideus, sp. n.] 
Concolorous . 2... ee ee ee ee ee ee 1, 
12. Elytra about twice as long as the prothorax . ...... 18. 
Elytra less than twice as long as the prothorax. . . . . . ~ [letzneri, Ferr.] 
13. Castaneous; the antennal club broad oval . . . . . . . . [castaneus, Ferr. | 
Black; the antennal club narrow oval . . . . . . « . . [eolumbianus, Hopk. | 
