16 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 119 



convex in the middle. Foredisc with two (1 + 1) ovate calloused 

 spots, laterad of them mth two (1+1) longitudinal ridges, the latter 

 covered with incrusted, curled hairs. Hind-disc partially rugose 

 with half obliterated setigerous granules. Humeri raised. 



Scutellum shorter than width at base (20:26). All borders 

 carinate; lateral borders straight, tip pointed. Disc transversely 

 rugose; median carina tapering backward, covered with dense, 

 curled, incrustate hairs. 



Hemelytra reaching apical third of tergum VII. Basolateral 

 borders of corium reflected; apical border straight exteriorly, sinuate 

 interiorly. Apical angle of corium pointed, reaching slightly over 

 the hindborder of connexival segment II. Membrane large, with 

 anastomosed veins, thickly covered mth whitish incrustation. 



Abdomen longer than mdth across segment IV (90:66); lateral 

 borders moderately convex. Exterior borders of connexival segments 

 II to V slightly convex; postero-exterior angles protruding, and 

 rounded on connexival segments II to IV; subangular but not pro- 

 truding on VI and VII; VI forms a slightly obtuse angle, with rounded 

 tip; VII forms a slightly acute angle, directed backward and slightly 

 sideways, tip rounded reaching to middle of paratergites. Parater- 

 gites small, clavate, reaching to middle of hypopygium; latter large, 

 subcordate, with a moderately wide median ridge. Spiracles ventral 

 on II to V; lateral and visible from above on VI to VIII. 



Color. — Ferruginous to dark ferruginous; tibiae with a wide 

 yellow-brown subbasal ring. Connexival segments III to VI each 

 with two, connexival segment VII mth one, round, yellow-brown, 

 calloused spots. 



Measurements. — Total length 6.84 mm.; width of pronotum 2.14 

 mm.; width of abdomen 2.64 mm. 



HoLOTYPE. — Male, Callanga, Peru, 1300 m., F. Woytkowski col- 

 lector, Feb. 13, 1953 (USNM type 67589). 



Miorrhynchus undulatus, new species, is closely related to M. 

 championi Kormilev but differs from it by the undulate lateral borders 

 of abdomen which are not undulate in M. championi. 



Genus Placogenis Usinger and Matsuda 



Placogenis Usinger and Matsuda, 1959, Classification of the Aradidae, p. 352. 

 Diphyllonotus Kormilev, 1959, Proc. Ent. Soc. Washington, vol. 61, p. 61. 



In a manuscript submitted for publication in 1955, the author 

 originally proposed the name Diphyllonotus with the single included 

 species D. explanatus. Unfortunately, the manuscript was lost by 

 the printer. Thus the second species of the genus, D. brachypterus, 

 was published in 1956 before the genus was validated. It was not 



