Calvert : Odonata of the Neotropical Region. 187 



inferiorly ; ill-defined greenish postocular spots, yellow of rear of 

 head immediately adjoining dotted with black, nasus and labrum 

 obscure olive. 



Prothorax greenish-brown, the grooves and sutures occupied by 

 dark lines, a curved brown mark on each side of the middle lobe ; 

 meso-metathorax greenish, its markings as above described for the 

 younger males. 



Abdominal segment i yellowish, with a dorsal black spot ; 2-10 at 

 first yellow, later red, with the following black markings : a transverse 

 line on the intersegmental articulations beginning with that between 

 2 and 3 ; an isolated transverse mark on the dorsum of 2 at two-thirds' 

 length ; a spot at the fifth sixth of 3 and 4, not reaching back to the 

 hind end of the segment, but in some prolonged more or less forward 

 as a fine mid-dorsal line ; a rounded spot on the hind fifth of 5 and 6, 

 in some prolonged forward, in others as a narrow mid-dorsal stripe 

 almost to the base of each ; nearly all of the dorsum of 7-10. 



Hind margin of 10 narrowly cleft mid-dorsally about one-third way 

 toward the anterior end. Appendages shorter than 10, conical, black. 

 A ventral apical spine on abdominal segment 8. Genital valves yel- 

 low, reaching caudad almost to the level of the hind end of 11 (anal 

 tubercle), their ''palps" dark, reaching beyond the level of the tips 

 of the abdominal appendages. 



Legs as above described for the younger males. Pterostigma ochre - 

 brown, oblique. 



With age the browns of the body generally become darker and dul- 

 ler, vertex obscure blackish, but no black mid-dorsal thoracic band 

 forms as in the male. 



c?9. Pterostigma in the majority of both sexes with the costal edge 

 longest, but with a tendency (more marked in the hind wings and in 

 the examples from Sapucay) to have the costal edge occasionally 

 equal to, or even shorter than, the proximal or distal edges. Vein A 

 ( = inferior sector of the triangle of de Selys) separating from the 

 hind margin of the wings at, or slightly distal to, the cubito-anal cross- 

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

 Selys) arising nearest the fourth postnodal (occasionally the fifth) on 

 the hind wings. Postnodals, 10 6\ 5 9, Chapada, front wings, J* 

 io-ii (n), 9 9-11 (11) ; hind wings, c?9 8-10 (9). Postnodals, 

 7 d\ 2 ?, Sapucay, front wings, c? n-12 (12), 9 n-13 (13); 

 hind wings $ 9-10 (10), 9 10-11 (10). Parentheses enclose the 

 numbers of greatest frequency. 



