166 



Annals of the Carnegie Museum. 



io Janeiro. 



Cachoeira. 



3-24 



2.92 



•52 



.52 



.16 



.178 



1.04 



1. 12 



.8 



.6 



i-3 



1.87 



•4 



.24 



•72 



.72 



•55 



-33 



and in gracile minarum the process is half as wide as the segment. 

 The following measurements in millimeters may be compared with 

 those given under the preceding subspecies : 



gracile type gracile ascendens 



( 1 ) Width of head. 



(2) Width of one postocular spot, etc. 

 Ratio of (2) to (1). 



(3) Maximum height of 10. 



(4) Height of 9 at base. 

 Ratio of (3) to (4). 



(5) Width of tip of process on 10, end view. 



(6) width of 10, end view. 

 Ratio of (5) to (6). 



The colors of gracile ascendens are as in gracile type, the hindmost 

 sixth of abdominal segment 10 being blue. Front wings with 9 post- 

 nodals, hind wings with 8 ; M 2 and M la arising on the hind pair at the 

 fourth and seventh postnodals respectively. Abdomen 27, hind wing 

 16 mm. 



Habitat : — Brazil, Cachoeira, by H. H. Smith, 1 cT numbered 46. 

 Carnegie Museum, Pittsburgh. 



74. Acanthagrion apicale Selys. 



(Plate V, figs. 82, 82a.) 

 Habitat: — Peru, Iquitos, Staudinger, id\ Museum of Compara- 

 tive Zoology, Cambridge, Mass. 



75. Acanthagrion cuyabae sp. nov. 



(Plate V, figs. 85, 86.) 



cf . Upper surface of the head black, with the usual pale (green) 

 postocular spots ; face up to the level of the second antennal joint and 

 including the first joint (and in some also the anterior surface of the 

 second joint) pale green ; a short line on each side of the nasus, in 

 some a mid-nasal point and a line on the fronto-nasal suture, and a 

 mid-basal labral point, black ; rear and under surfaces of the head pale. 



Prothorax black ; a mid-dorsal spot on its front lobe, a lateral spot 

 and often a pair of median dots or lines on the middle lobe, and the 

 sides inferiorly pale green ; hind margin of hind lobe convex, not 

 remarkably produced. 



Dorsum of remainder of thorax black ; a pale green antehumeral 



