390 Ml-, G. J. Arrow on LamelUcorn Beetle 



XLVIII. — On LamelUcorn Beetles belonr/ing to the Suhfamilies 

 Ocliodgeiiiffi, Orplminas, Hybosorlnse, and Trogiuse. By 

 Gilbert J. Arrow. 



(Published by permission of the Trustees of the British Museum.) 



The genus Ochodceus is evidently destined to become a very 

 large one, especially as regards its American representatives. 

 Nineteen species from the United States have been recently 

 enumerated by Mr. Fall (Journ. New York Ent. Soc. xvii. 

 1909, p. 30), and the four from Central America and tiuee 

 from South America, wiiich are all that have yet been 

 described from that huge area, certainly give a wholly in- 

 adequate notion of those actually existing there. Owing no 

 doubt to peculiarly retiring Jiabits possessed by these beetles, 

 single specimens only seem to be generally found, and those 

 rarely. The sexes differ in the most distinctive characters, 

 which are generally those of the male, so that the proper 

 association of male and female is difHeult. The types of all 

 the seven species mentioned above are in the British Mu- 

 seum, and as the discrimination of tiie Central-American 

 forms in the ' Biol. Centr.-Americana ' is unsatisfactory, I 

 have thought it desirable to draw up a table of the specie?, 

 ad ling a few new ones, by which the total is raised to t'.n. 



Synojisis of Central- An erican Species of Ochodteus. 



1 (6). Apical angles of the elytra produced. 



2 (5). Pronotum closely granulated. 



3 (4). Vertex of the liead bearing a transverse 



carina luridus, Westw. 



4 (3), Vertex of the head without a transverse 



carina biarmatus, Lee. 



6 (2). Pronotum distinctly punctured puncticoUis, sp. u. 



6 (1). Apical angles of the elytra not ])roduced. 



7 (10). Head without tubercles. 



8 (9). Head flat ; clypeus not very small 2)lan{ceps, sp. n. 



9 (8). Clypeus very small, with the margin feebly 



elevated at the sides and middle prasidii, Bates. 



10 (7). Head tuberculate. 



11 (18). Clypeus bituberculate. 



12 (13). Pronotum distinctly punctured jjollicaris, Bates. 



13 (12). Pronotum densely gi'anulated. 



14 (15). Elvtra clothed with close decumbent setse . hotidura, sp. n. 



15 (14). Elytra clothed with erect 6eta3. 



IG (17). Vertex bearing a slight transverse carina. . fraterculus, sp. n. 



17 (10). Vertex without a transverse carina seftdnsus, Bates. 



18 (11). Clypeus unituberculate ei/ops, sp. n. 



