Calvert: Odonata of the Neotropical Region. 167 



stripe, which widens inferiorly, and at mid-height is one-third to one- 

 half as wide as the black mid-dorsal band and one-half to three-fourths 

 as wide as the black humeral stripe ; sides of the thorax pale green, a 

 short black line at the upper end of the second lateral suture. 



Dorsum of abdominal segments 1-7 and 10 black, which black is 

 narrowly constricted at the hind end of 1 and the base of 3, or in 

 some interrupted near the hind end of 1, thus forming a transverse 

 green ring, widened angularly before the hind end of 2 and sub- 

 sequently contracted to its former width, widened also at the hind 

 ends of 3-7. Sides of 1-7 pale green, or posteriorly pale blue, con- 

 fluent with a narrow green ring at the articulation of 1 and 2 and at 

 the base of 4-7 ; the dorsal black of 2 extends broadly forward to the 

 green ring above mentioned and is not at all pointed anteriorly, as is 

 the case on 3 ; 8 and 9 and the sides of 10 blue. Hind margin of 10 

 but very slightly elevated into a process, which has the general form 

 of that of A. gracile and is truncated at the tip. 



Superior appendages shorter than 10, of the general form of those 

 of A. gracile, but shorter, directed ventrad as well as caudad ; in pro- 

 file view, contracted near the middle of their length, thicker at both 

 base and apex, which latter is rounded ; in dorsal view each appendage 

 has an inner (mesal) process at the base, which, as in gracile, is in 

 contact with the process of its fellow of the opposite side. 



Inferior appendages shorter than the superiors and than those of 

 gracile ; each curved strongly upward in its distal half as well as 

 towards the median line. 



Legs pale green, femora with a superior black band, tibiae with a 

 superior and an inferior black line less marked on those of the third 

 legs, tarsal articulations black. 



Wings clear, stigma rhomboidal, blackish, its costal edge longest. 

 Front wings with 8-9 postnodals, 9 most frequent ; hind wings with 

 7-8 postnodals, 7 most frequent, M 2 arising nearest the fourth. 



Dimensions : Abdomen 23-25 ; hind wing 14-16 ; width of head 

 3 ; width of one postocular spot .56 ; maximum height of segment 10 

 .76 ; height of segment 9 at base .68 ; width of tip of dorsal process 

 of 10 .32 ; maximum width of 10 .74 mm. 



?. Unknown. 



Habitat : — Brazil, Cuyaba, 4 c? and parts of three others ; 

 Uacaryzal, 1 cT ; Cachoeira Cuyaba, flooded campos, January 26, 2 S* 

 and parts of 7 others, some numbered 12, 24 or 25 by the collector; 

 all by H. H. Smith. Carnegie Museum, Pittsburgh. 



