Calvert : Odonata of the Neotropical Region. 197 



longer to shorter than the proximal or distal edge, no one proportion 

 existing in a majority of the specimens. Anal vein separating from 

 the hind margin of the wings proximal to the cubito-anal cross-vein in 

 the greater majority of cases, but at a varying distance. Postnodals 

 on the front wings 8-9 (8 more often), on the hind wings 6-8 (7 

 more often) ; M a on the hind wings arising nearest the fourth postnodal 

 (90 per cent.). 



Abdomen $ 18.5-20.5, $ ?; hind wing $ 12-13, 9 13.5 mm. 



Habitat : — Brazil, Chapada, by H. H. Smith, 4 $ and parts of 

 5 cJ\ i ?> numbered 43 by the collector, one male dated May. Car- 

 negie Museum, Pittsburgh. 



Genus Metaleptobasis. 



Calvert, Biol. Centr.-Amer. Neurop., p. 386. 1907. 



Additional material indicates that the character drawn from the 

 anal vein (= inferior sector of the triangle of de Selys) as originally 

 given for this genus is variable. The other diagnostic features hold 

 true, viz. : M 2 (= nodal sector of de Selys) arising nearest the fifth or 

 sixth postnodal on the hind wings, the sixth or more remote on the 

 front wings, tarsal claws toothless, superior appendages of the male 

 not bent down almost at a right angle in their apical half, genital 

 valves of the females not reaching far beyond the level of the tips of 

 the abdominal appendages. 



102. Metaleptobasis diceras. 



(Plate VI, figs. 106, 107, 114.) 

 Leptobasis diceras Selys, Bull. Acad. Belg. (2) xliii, p. 102. 1877. 



d\ The male described by de Selys (from Para) lacked the last 

 four abdominal segments. The following notes are added from a male 

 of what seems to be the same species : 



Abdominal segment 7 similar to 6, i. e., pale brown, darker at the 

 hind end, perhaps with metallic-blue reflection in an older stage ; 

 8-10 pale (blue?), the three together (3 mm.) only three-fifths as 

 long as 7. Hind dorsal margin of 10 entire, very slightly elevated in 

 the middle."; 



Superior appendages slightly shorter than 10, in dorsal view curved 

 regularly toward each other, each decreasing slightly in width from 

 base to the obtusely truncated apex ; in profile view, each appendage 



