106 RHYNCHOPHORA. 
line; the second has one pore on one side and three on the other, of which one 
stands outside the impression. | 
We figure the prothorax of the former example. 
The male is not unlike P. longulus, 2 , Chap., differing in having the third interstice 
the most prominent at the apex. In this point it is allied to P. angustatus, Dej., but 
it can be separated from either of the last-named species by its smaller size and 
furrowed forehead. 
Division PLaTyPi TRISPINATI, Chapuis. 
27. Platypus compositus. | 
Platypus compositus (3), Say, Journ. Ac. Phil. ii. p. 824°; g 2 (lege 2? 3), Chap. Mon. Plat. 
p. 163, fig. 75°; Lec. Rhynch. N. Am. p. 344°. 
Hab. Nortu America }, Illinois, South Carolina, Texas, and Florida ?.—MExico ”. 
A common North-American species, not represented in our collections. Any record 
of its occurrence in Mexico must be taken as doubtful, that of Chapuis appearing to be 
a conjecture. It probably extends into its northern provinces. 
Leconte? assumes the identity with this species of P. parallelws, Chap. (? Fabr.), 
and suggests that of P. tremiferus, Chap., P. perfossus, Chap., and P. rugosus, Chap. 
These identifications, however probable, were not made with the assistance of typical 
specimens, and require proof. 
28. Platypus poriferus. 
Platypus poriferus, 2 (lege 3), Chap. Mon. Plat. p. 168, fig. 80°. 
? Platypus viduus, 3 (lege 2), Chap. Mon. Plat. p. 178, fig. 89°. 
Hab. Mexico”, Toxpam (Sallé!), Teapa (H. H. Smith); Guatemata, El Tumbador, 
Cerro Zunil, Zapote, Duefhas (Champion); Panama, Volcan de Chiriqui, Bugaba 
(Champion). 
Fourteen examples; a type of the male has been acquired with M. Sallé’s collection. 
The female specimens correspond in all respects with the description of P. viduus, Chap., 
of which no type has been available for examination. Both sexes vary in length (3°6- 
4:2 millim.)—a variation which, though slight, indicates a greater range of size than is 
usual in the genus. The examples show no specific differences between themselves, 
and probably some other allied species of Chapuis are but varietal forms of this insect. 
29. Platypus rudifrons. 
Platypus rudifrons, 3 (lege 2), Chap. Mon. Plat. p. 179, fig. 90°. 
Hab. Mexico, Teapa!. 
I know this species by the type only. It is recognized by the oral half of the front 
being opaque and impunctate. 
