Calvert : Odonata of the Neotropical Region. 189 



slightly longer and slenderer than those of O. basale ; apex rounded 

 in profile view ; an upper-inner basal proces sterminating in a black 

 tip, which is applied against the tip of the process of the appendage of 

 the opposite side of the body. 



Inferior appendages, in profile view, reaching caudad to very little 

 more than half the level the superiors, tapering rapidly in the basal 

 half of each, distal half very slender, curved upward and inward, a 

 little more strongly than in O. basale. 



Legs yellowish, with an anterior dark stripe on femora and tibiae, 

 narrower and interrupted on the latter; third tibia with 7-8 black 

 spines in the outer (anterior) row. 



Wings clear, veins brown ; stigma red, oblique, varying in its pro- 

 portions in that the costal edge is longer than, equal to, or shorter 

 than the proximal or distal edges in different individuals. Vein A ( = 

 inferior sector of the triangle of de Selys) separating from the hind 

 margin of the wings distal to, or less frequently at, the cubito-anal 

 cross-vein (= basal postcostal of de Selys). M 2 (= nodal sector of 

 de Selys) arising on the hind wings nearest the fifth postnodal, or 

 more distad. Postnodals, 9 d\ Chapada : front wings 10-12 (12), 

 hind wings 9-1 1 (10); 5 cT, Sapucay : front wings 12-15 ( I2 )> hind 

 wings, 10-13 (11). Parentheses enclose the numbers of greatest fre- 

 quency. 



Dimensions in millimeters : abdomen 27.5-28.5 (Chapada), 28-30 

 (Sapucay); hind wing 17. 5-19. 5 (Chapada), 19. 5-21 (Sapucay) ; 

 width of tip of dorsal process of abdominal segment 10, end view, .48 ; 

 maximum width of 10, end view, .76. 



9 unknown. 



Habitat : — Brazil, Chapada, by H. H. Smith, 2 cT and parts of 7 

 others, some dated May, some numbered 93 and 185. Carnegie Mu- 

 seum, Pittsburgh. 



Sao Paulo, by A. Hempel, September 7, 1900, 1 tf. Academy of 

 Natural Sciences of Philadelphia.! 



Paraguay, Sapucay, by W. T. Foster, January 16, 1903, 5 J*, no. 59 

 (one other c? numbered 59 is O. basale). United States National Mu- 

 seum. 



This species very much resembles O. basale, with which it was united 

 by Mr. Foster under the same collection number. As the dates of col- 

 lection at Sapucay are not identical, but differ by one day, it is prob- 

 able that the two species do not occur in the same topographical 



