390 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lu 



apex; latter very narrowed and elongate, the narrowed tip about 

 twice as long as broad. 



Hemelytron: Corium shining, very faintly alutaceous, obsoletely 

 wi-inkled; corioclaval suture obsolete, the two rows of bordering 

 punctures very weak; usually not or only very weakly punctate 

 discally, along radial vein and in exocorial area; membrane brownish 

 hyaline, not surpassing apex of abdomen, length subequal to basal 

 width. 



Length of body: 5.43(5.28-5.71). 



Type data.— Holotype female (MCZ), "La Visite & vie, La Selle 

 Range, 5-7000 ft., Sept. 16-23, Haiti, 1934, Darlington." Paratypes: 

 5 females (MCZ, USNM, RCF), same data as holotype. 



Discussion. — This very distinct species is known only from six 

 female specimens. However, sexual dimorphism is not strongly 

 marked within this family so one may expect the males also to show 

 the unusual features mentioned above. 



Subgenus Rhytidoporus (Bergthora) Kirkaldy 



Cryptoporus Uhler, 1877, p. 381, nee Motschulsky (1858) in Coleoptera. 

 Bergthora Kirkaldy, 1904, p. 280. 



Diagnosis.— The single member of this subgenus separates most 

 easily from the species in the other subgenera by the more numerous 

 (15 to 20) sctigerous punctures on the costa. 



Type of subgenus. — Cryptoporus compactus Uhler (1877, p. 382), 

 monobasic; of Bergthora, the same species by objective synonymy, the 

 new generic name having been proposed to replace preoccupied 

 Cryptoporus Uhler for which the type had already been fixed. 



Distribution.' — The members of this subgenus occur in a limited 

 area in the southwestern United States (in Texas, New Mexico, and 

 Arizona) and all of Mexico. As yet, it is not known to occur on any 

 of the islands to the east or west of Mexico. 



Rhytidoporus (^Bergthora) compactus (Uhler), new combination 



Plate figures 93a, 193 



Cryptoporus compactus Uhler, 1877, p. 382. 



Aethus (Cryptoporus) compactus Signoret, 1882, p. 41, pi. 2, fig. 63.— Torre Bueno, 



1939, p. 179. 

 Aethus cojnpactus Uhler, 1886, p. 3 — Van Duzee, 1917, p. 20. 

 Cydnus compactus Lethierry and Severin, 1893, p. 65. — Banks, 1910, p. 99. 



Diagnosis.- — R. compactus is the only species in the subgenus. 



Description.— Male: Oval, widest posterior to middle. 



Head: Length two-thirds width, 0.82(1.78-0.93): 1.21 (1.16-1.33); 

 interocular width, 0.82(0.78-0.93); anterior outline semicircular; 

 clypeus as long as juga, slightly narrowed apically; surface convex. 



