Calvert: Odonata of the Neotropical Region. 131 



sixth. Segments 8 and 9 blue, with an inferior black stripe on each 

 side as long as the segments, or interrupted on 8; 10 black. 



9. Differs from the male as follows : a short pale line on each side 

 of the vertex of the male, between lateral ocellus and adjoining an- 

 tenna, is enlarged in young, but not in older females, into a spot, which 

 in the young may, or may not, be confluent with the spot of the opposite 

 side ; black of the frons incised on each side of the median ocellus in 

 the younger ; but not in the older specimens ; black mid-dorsal thoracic 

 stripe in some without any green reflection ; humeral line and mese- 

 pimeral stripe paler and indistinct, no black line on the upper end of 

 the obsolete first lateral thoracic suture in younger females ; second 

 lateral suture with a short black line on its upper part only ; dorsal 

 blue of abdominal segment 2 reduced to a narrow stripe as long as the 

 segment, lateral black stripe wider and reaching the entire length of 

 the segment ; blue mid-dorsal stripe on 3 and 4 as long as in the male, 

 but narrower, even reduced to a line in some ; 5 and 6 with a fine 

 pale mid-dorsal line ; 8 and 9 have in addition to the inferior lateral 

 black stripe on the male a dorsal black spot occupying the first two- 

 fifths to three-fourths of 8, half to two-thirds of 9, divided at its hind 

 end (.-. = two fused longitudinal stripes) and confluent on each side 

 at base with the inferior lateral black stripe : in some a small apical 

 dorsal black spot on 9, with which in three specimens the basal black 

 is united, thus forming a complete mid-dorsal black stripe narrowing 

 posteriorly ; some pale spots on 10 in younger females. 



cT9. Wings pale yellowish or pale brownish. Stigma of the front 

 wings surmounting more than one (63 per cent. d\ 86 per cent. 9), 

 one (33.3 per cent. d\ 10 per cent. 9) or less than one (3.3 per 

 cent. cT9) cell. Stigma of the hind wings surmounting more than 

 one (73 per cent. d\ 90 per cent. 9), one (23 per cent. J\ 10 per 

 cent. 9) or less than (3.3 per cent. cT) cell. 



Antenodal cells on the front wings 4 (93 per cent. d\ 83 per cent. 

 ?)> 3 ( IO Per cent. 9), 3 -f (3.3 per cent, d" 9), 4 + (3-3 per 

 cent. cT) or 5 (3.3 per cent. 9 ) ; on the hind wings 3 (86 per cent. 

 d\ 100 per cent. 9) or 3 + (14 per cent. J 1 ). All the percentages 

 based on 15 d\ 15 9. 



Dimensions: Abdomen cT 9 25-29.5; hind wing cT 20-22 ; 9 21- 

 24 mm. _ 



Habitat : Bolivia, Chulumani by W. J. Gerhard, November 30, 

 1898 -January 7, 1899, 28 cT 18 9 ; Road to Coroico, Yungas, by 



