234 Annals of the Carnegie Museum. 



The abdomen widens but slightly and very gradually from the base 

 of the third to the ninth segment, the latter 1.3 mm. wide, in the 

 male, 1.5 mm. in the female. This feature, the colors, and the nar- 

 row pale antehumeral stripes give this insect a marked resemblance to 

 the forms of Dythemis velox and have suggested the specific name 



proposed. 



154. Micrathyria atra Martin. 



Micrathyria atra Calvert. Biol. Centr.-Amer. Neurop., p. 225, pi. ix, figs. 13—15. 

 1906. 



Habitat : — Brazil, Rio do Janeiro, by H. H. Smith, 1 $. Car- 

 negie Museum, Pittsburgh. 



This male has no single cell reaching from M 4 to Cu x on the left 



hind wing. 



155. Micrathyria spinifera sp. nov. 



(Plate VII, fig. 134.) 



d\ Face and lips yellowish, becoming brownish with faint me- 

 tallic-blue reflection on the upper surface of the frons ; lateral 

 labial lobes narrowly margined with blackish-brown mesially and 

 anteriorly, free margin of labrum narrowly black in the middle, ver- 

 tex brown with metallic-blue reflection ; occiput brown, yellow behind. 



Hind lobe of prothorax viewed from behind slightly, but distinctly, 

 bilobed, bearing a row of long pale hairs. 



Thoracic dorsum dark brown with a metallic blue-green reflection, 

 a very narrow pale green antehumeral stripe reaching three-fifths of the 

 way to the antealar sinus, parallel with the mid-dorsal carina and its fel- 

 low of the opposite side. Immediately in front of the green black- 

 margined antealar sinus is a very fine isolated transverse pale green 

 stripe. A pale green sinuous humeral stripe widening inward (mesad) 

 at its lower half and confluent with the lower end of the above-de- 

 scribed antehumeral stripe. Sides of the thorax predominantly pale 

 green with the following dark brown stripes : one bordering the hu- 

 meral suture posteriorly and enlarged in its upper half into a spot 

 three times as wide as its lower half; a stripe on the obsolete first 

 lateral suture and one on the second lateral suture, anastomosing with 

 each other at the metastigma and again a short distance below the 

 metastigma ; the former also confluent with the posthumeral brown 

 stripe at the lower end of the mesepimeron. 



Abdomen narrowed at the base of segment 3 to 6 mm., thence 



