246 PROCEEDINGS OF THE NATIONAL MUSEUM vol. us 



of the scutellum to the tip of the male hypopygium or to segment IX in 

 the female. The width of the scutellum was taken at the base; of the 

 abdomen, at the widest part. The proportions of the antennal 

 segments were taken from the first to the fourth segments. 



Subfamily Mezirinae Oshanin, 1908 



The collections comprise many specimens of mezirines from the 

 Neotropical Region. It is significant to note that the numerous new 

 species of the genus Mezira Amyot and Serville, mostly from the 

 tropical areas of South America, vividly indicate the incompleteness 

 of our present knowledge of the Aradidae from this vast geographical 

 region. 



Genus Placogenis Usinger and Matsuda 



Placogenis Usinger and Matsuda, 1959, Classification of Aradidae, British Museum 



(Natural History), London, p. 342, fig. 100. 

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



1,2. 



Placogenis brachyptera (Kormilev) 



Diphyllonotus brachypterus Kormilev, 1956, Anal. Soc. Cient. Argentina, vol. 

 162, p. 151. 



Remarks. — This species was described originally from a single 

 brachypterous female from Santa Catarina, Brazil. The abbreviated 

 membrane of the forewing reaches to only the front margin of tergum 

 VI. In the Drake Collection I found a female specimen with fully 

 developed forewings that extended backward to the middle of tergum 

 VII. 



Measurements. — Macropterous female: Head almost as long as 

 wide (27:27.5); proportions of antennal segments 14:10:17:13; 

 pronotum much shorter than wide (28 : (45) : 53) ; scutellum shorter 

 than wide at base (19:29); abdomen as long as wide (92:92). 



Length 5.3 mm. Width of pronotum 1.76 mm. Width of abdo- 

 men 3.07 mm. Other characters as in brachypterous form. 



New RECORD. — Female, macropterous, Rio de Janeiro, Brazil, 

 Drake CoUection (USNM). 



Genus Cinyphus Stal 



Cinyphus St&l, 1865, Hemiptera Africana, vol. 3, p. 31. 

 Cinyphus saileri, new species 



Figures 1, 2 



Male. — Elongate ovate, tapering forward; body covered with 

 curled rusty hairs. 



