Calvert : Odonata of the Neotropical Region. 149 



antehumeral stripe one-fourth to two-fifths as wide as the black mid- 

 dorsal at mid-height, black humeral stripe nearly twice to one and 

 one-half times as wide as the pale antehumeral ; the violaceous area 

 on the anterior part of the dorsum of abdominal segment 2 reduced in 

 width to about one-third of that of the segment, the lateral black stripe 

 not reaching to the inferior margin, but there is an elongated isolated 

 brown spot on the posterior half of the yellowish side of the segment ; 

 3 and 4 chiefly black, the mid-dorsal pale stripe much reduced in 

 width, although of about the same length ; 5-7 black, with a mid-dorsal 

 pale line from base backward (caudad) to five-sixths (on 5) or one- 

 half (on 7) of the length of the segments; 8 and 9 with black pre- 

 dominating in the form of four longitudinal stripes, two dorsal, and 

 an inferior on each side, all four reaching from end to end of segment 



8 (or the two dorsals interrupted at three-fourths' length), all four fused 

 at base and at apex, the basal fusion between each lateral and its adja- 

 cent dorsal extending for the anterior two-thirds of the segment ; on 



9 the inferior lateral black stripes reach from end to end of the seg- 

 ment, the dorsals from base to two-thirds of the length, each dorsal 

 being fused with its adjacent lateral for the basal half or third of the 

 segment, but with its fellow dorsal only at the extreme base ; 10 pale, 

 with a narrow transverse basal black stripe, the posterior margin of the 

 segment cleft mid-dorsally and narrowly for almost the whole length of 

 the segment. 



c?9. Stigma of the front wings surmounting more than one (75 

 per cent. d\ 83 per cent. 9) or one (25 per cent, c?, 17 per cent. 

 9) cell ; of the hind wings surmounting more than one (85 per cent. 

 cf, 66.7 per cent. 9 ) or one (15 per cent, cf, 33-3 per cent. 9) cell. 



Antenodal cells on the front wings 3 (80 per cent. d\ 100 per cent. 

 $ ) or 4 (20 per cent. ^) ; on the hind wings 3 (100 per cent. J\ 

 83 per cent. $ ) or 2 (17 per cent. 9). Percentages based on 10 d\ 



3?- 



Dimensions : abdomen c? 24-26.5, 9 23.5 ; hind wing c? 18-19. 5, 



9 19-20 mm. 



Habitat: — Brazil, Chapada, by H. H. Smith, 5 c? ( and parts of 



10 others), 2 9 (and parts of 1 other), 1 c? 1 9 each numbered 85, 

 other males numbered 83 and 149, females 78 and 188 by the collec- 

 tor. Carnegie Museum, Pittsburgh. 



The specific name proposed is that of a tribe of Brazilian Indians. 

 The postocular spots of both sexes of this species are rather distinc- 



