no. 2089. NOTES ON NEOTROPICAL DRAGONFLIES— WILLIAMSON. 615 



showing through. Metepimeron flesh colored, its posterior and lower 

 fourth (a triangular area) bright yellow as though overlaid with pig- 

 ment, traces of green showing in the yellow. Coxae and legs pale 

 yellow, spines short and sparse, dark brown; tarsal claws light brown, 

 darker at apex, a minute tooth present. 



Abdominal segment 1 brown above in median line, sides above 

 greenish blue, basally and below light yellow; 2 brown above, darker 

 apically, sides above greenish blue, below light yellow; 3-8 black 

 above, 3-5 with greenish reflections, brightest on 3 and successively 

 duller on following segments; interrupted basal rings on 3-7, nar- 

 rower and complete on 8, greenish blue on 3, pale yellowish on 4-8; 

 3-7 greenish yellow beneath, brighter on the proximal segments, 

 becoming duller, darker and obscured on the distal segments; dorsal 

 color carried on the sides apically of 3-6 as lateral spots; sides of 7 

 largely and of 8 entirely dark; 9-10 bright light blue; superior appen- 

 dages brown, inferiors pale flesh. 



Stigma very dark brown, sides subequal, oblique, covering less than 

 one cell. Quadrangle of front wing with ratio of anterior to posterior 

 side 2:5; of hind wing 2 :3. Postnodals, front wings 10, hind wings 8 

 or 9. Arculus at second antenodal. Posterior wing margin meeting 

 A slightly distal to cubito-anal cross-vein in front wing, and at 

 the cubito-anal cross-vein in hind wing. K s arising from the vein 

 of the nodus; M 3 in front wing arising from almost the same 

 point, in the hind wing very closely to the vein of the nodus but 

 appreciably proximal to it; in all four wings R s and M 3 closely approx- 

 imated at the first cross-vein between them and widely separated 

 from M 4 at the same point. M 2 in front wing arising just proximal 

 to fifth postnodal, in hind wing just proximal to fourth postnodal. 

 M ia arising in front wing at eighth postnodal, in hind wing at seventh 

 or eighth. Cu x in front wing terminating on a level between fifth and 

 sixth postnodals or at the sixth, in the hind wing at about the sixth ; 

 Cu 2 in front and hind wings terminating at the third postnodal. 



Described from a single male in my collection taken March 10, 1912, 

 at a small swamp near Cumuto, Trinidad, described on page 601 

 of this paper, by Mr. B. J. Rainey, to whom I am indebted for this and 

 many more dragonflies, and for whom I take pleasure in naming the 

 species. 



The following brief notes on colors made from the freshly killed 

 insect will give some idea of its peculiar beauty when alive. Dorsum 

 of thorax black, a vivid ultramarine blue line just above the humeral 

 suture. Below this blue line and all of the mesepimeron dark dull 

 green; metepisternum largely vivid emerald; metepimeron pale 

 lemon yellow. Eyes beneath emerald, above nile green; vivid ultra- 

 marine irregularly rounded postocular spots. Legs pale yellow, 

 translucent. Abdomen: apex of 1, all of 2 and base of 3 laterally 

 vivid blue as on thorax and postocular spots; sides of 3-7 yellowish; 



