252 Annals of the Carnegie Museum. 



cross-vein, occupying also some of the anal area at base. The hind 

 wings also with two ochre-brown basal streaks in the same areas, 

 the first reaching to the upper end of the arculus, the second to the 

 second (or distal) cubito-anal cross-vein and posteriorly to the apex 

 of the membranule ; these two basal streaks are fused at base, but 

 separate, distal to the level of the first cubito-anal cross-vein in the 

 median area. Tooth of the nails less than half as long as the tip of 

 the nail itself on both nails of all the legs. 



Dimensions: Abdomen cT 26.5, $ 23; hind wing (J 1 23.5-24, 

 $ 24.5 mm. 



Habitat : — Brazil, Chapada, by H. H. Smith, 1 cT and parts of 

 6 others; 2 $ and part of 1 other, no. 100. Carnegie Museum, 

 Pittsburgh. 



The sexual difference in the tarsal nails is interesting, and furnishes 



a transition from the condition found in the more typical species of 



Brechmorhoga, or of Dythemis, to that observed in Macrothemis. On 



comparing the tarsal nails of the same leg, it is evident that the outer 



nail of the second and third legs is distinctly shorter than the inner 



nail, the length of both nails being subequal to the tip of the tooth ; 



the shorter length of the outer nail is due to a shortening of the tip 



of the nail itself. 



Genus Macrothemis. 



$ I. Hind wings of 9 with only one row of posttriangular cells. ( $ unknown.) 



190. Macrothemis uniseries sp. nov. 



?. Wings with a basal brown streak in the subcostal area reaching 

 half-way to the first antenodal on the front wings, two-thirds-way to 

 the first antenodal on the hind wings, on which latter the brown over- 

 flows a little at the extreme base into the costal and median areas ; 

 cubital area of hind wings from base to cross-vein a little less deeply 

 brown than the streak just described ; first two anal cells bordering the 

 anal vein distal to membranule yellow. 



Pale green antehumeral stripes faded, apparently similar to those of 

 musiva [i. e. T-shaped] ; sides of thorax pale green ; a dark brown 

 stripe on the obsolete first lateral thoracic suture to a short distance 

 above the metastigma, where it enlarges into a rounded spot ; a nar- 

 rower dark brown stripe on the second lateral thoracic suture for its 

 entire length, narrowing upward. 



Abdomen 30, hind wing 27 mm. 



c? unknown. 



