18 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 119 



Scutellum shorter than width at base (15:22), Lateral borders 

 carinate, almost straight; tip rounded. Disc inflated, transversely 

 rugose, provided with a stout median carina, tapering backward. 



Hemelytra complete, reaching apical fourth of tergum VII. 

 Corium short, not reaching hindborder of connexival segment II; 

 basolateral border straight and reflexed, then flat and convex; 

 apical border evenly sinuate; apical angle rounded. 



Abdomen longer than width across segment IV (72:63). Lateral 

 borders evenly convex; postero-exterior angles not protruding. Suture 

 between connexival segments II and III not discernible. Tergum 

 VII with a transverse carina along the hindborder, and a transverse 

 sulcus in front of it. Paratergites large, triangular, reaching middle 

 of segment IX; latter notched posteriorly, Spriacles II to V ventral, 

 placed far from border; VI to VIII lateral and visible from above. 

 Female with second valvula longer than second valvif er. 



Color. — Ochraceous; lateral borders and apex of scutellum, antero- 

 exterior angles of connexiva II to VII, spots on terga near joints of 

 connexival segments III and IV, IV and V, V and VI, a spot in middle 

 of hindborder of tergum VII, and the base of tergum VIII, fuscous 

 to piceous. 



Measurements. — Total length 5.28mm.; width of pronotum 1.76 

 mm.; width of abdomen 2.52 mm. 



HoLOTYPE. — ^Female, Ciudad Universitaria, Tucuman, Argentina, 

 J.F.G. Clarke collector, Feb. 19, 1959 (USNM type 67590). 



It is a pleasure to dedicate this species to the collector, Dr. J. F. 

 Gates Clarke, Senior Scientist in the Department of Entomology in 

 the U.S. National Museum, Washington, D.C. 



Placogenis clarkei, new species, is related to P. brachyptera (Kormi- 

 lev) from which it may be separated at once by different proportions 

 of antennal segments, particularly by the relatively longer segment 

 III. 



Genus Notapictinus Usinger and Matsuda 



Notapidinus Usinger and Matsuda, 1959, Classification of tlie Aradidae, p. 361. 



The genus Notapictinus was established by Usinger and Matsuda 

 for reception of the American species lacking the stridulatory appara- 

 tus and previously referred to the genus Pictinus Stal, 1873. 



Usinger and Matsuda originally referred six species to Aotapictinus 

 but the genus is much larger. In my key for separation of the species 

 of the genus Notapictinus (1964) are included 25 species, three more 

 are described herewith, and we may expect that further species will 

 be described before long. 



