484 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ii4 



This species can be recognized by the peculiar punctation of the 

 prothorax, the narrow frons, tlie suberect setae, and the distinctive 

 median lobe of the male. 



Maemactes pilosus Champion 



Figure 1, k, I 



Maemactes pilosus Champion, Biologia Centrali-Americana, Coleoptera, vol. 4, 

 pt. 4, p. 529. 



This species was originally described from two specimens from 

 Cuernavaca, Mexico. A small series in the California Academy of 

 Sciences is labeled "Maria Madre Island, village, Tres Marias Islands, 

 May 14, 1925, H. H. Keifer"; the islands are located off the coast of 

 Nayarit, Mexico. Mr. R. T. Thompson, of the British Museum 

 (Natural History), kindly compared several specimens with the type. 

 He states that pilosus has the surface of the prothorax smooth, with a 

 flat median line; the specimens from Maria Madre Islands have the 

 surface of the prothorax microreticulate and the median line slightly 

 raised. At present I prefer to use one name for both populations. 



Length, 5.2 to 6.0 mm.; width, 2.2 to 2.6 mm. 



Maemactes ritficornis Boheman 



Figure 1, e, f 



Maemactes ruficornis Boheman, in Schoenherr, Genera et species curculionidum, 

 vol. 4, p. 277, 1837. — Cliampion, Biologia Centrpli- Americana, Coleoptera, 

 vol. 4, pt. 4, p. 529, pi. 26, figs. 11, 11a, 1905. 



Known to occur only in Mexico: Capulalpam, Cerro de Plumas, 

 Matamoros, Izucar, Mexico City, "Mineral del Oro," Oaxaca, Puebla, 

 Salazar, Sierra de Durango, Toluca, and Tula. 



See discussion of Maemactes imitator for characters separating that 

 species from M. ruficornis. 



Length, 4.7 to 6.5 mm.; width, 2.1 to 2.7 mm. 



Maemactes imitator, new species 



Figure 1, g, h 



Length, 5.43 mm.; width, 2.25 mm. Elongate oval, dark piceous, 

 sparsely clothed with short yellowish setae. Rostrum stout, shorter 

 than prothorax, depressed throughout, basad of insertion of antennae 

 punctures irregular, deep, moderately coarse; distad of same point 

 with moderately dense, elongate, deep punctures; in dorsal view 

 ratio of width of frons to width of rostrum at widest point at base as 

 1:2, ratio of width of frons to width of rostrum at insertion of antennae 

 as 5:6; in lateral view rostrum evenly merging with head; head with 

 rather small, deep, moderately close punctures; eye acutely oval, 



