164 Annals of the Carnegie Museum. 



9 (26.7 per cent.), 10 (70 per cent.), 11 (3.3 per cent.); on the 

 hind wing 7 (6.7 per cent.), 8 (73.3 per cent.), 9 (20 per cent.). 

 On the hind wings of these fifteen males, M 2 arises at the fourth 

 postnodal in every case, M la (= ultranodal of de Selys) at the sixth 

 (6.7 per cent.), seventh (86.7 per cent.) or eighth (6.7 per cent.) 

 postnodal. 



Habitat: — Brazil, Chapada, by H. H. Smith, 15 c? and parts of 

 25 ? others, 1 9 and parts of 3 ? others, some numbered 29, 35, 44, 

 49, 79, 120, 148, 379 by the collector. Carnegie Museum, Pittsburgh. 



Paraguay, Sapucay, by W. T. Foster, January 16, 17, and 27, 

 1903, 4 d\ numbered 16 by the collector. United States National 

 Museum. The single female from Sapucay is gracile type. 



72. Acanthagrion gracile ablutum, subsp. nov. 

 (Plate V, fig. 80.) 



cT. Head dark brown or bla< k above, each large blue postocular 

 spot dotted here and there with black ; nasus, a mid-basal labral point, 

 antennse, and in some even the lower part of the frons and the 

 rhinarium black, remainder of the face blue, underside and rear of 

 head very pale blue, or cream -color. 



Prothorax black, its sides inferiorly, a lateral spot and a pair of 

 median dots on the middle lobe blue. Hind margin of hind lobe 

 convex, not remarkably produced. 



Remainder of thorax blue, the following black : a mid-dorsal band 

 .88 mm. wide at mid-height, an elongated spot at the upper end of 

 the humeral and of the second lateral suture, a line on the upper end 

 and a round dot (often brown) at about mid-length of the obsolete first 

 lateral suture ; a large angular brown spot occupies the lower end of 

 the mesepimeron and the mesinfraepisternum. 



Abdomen black, the following blue : the sides and under surfaces 

 of 1-10, except* where encroached upon by the dorsal black at the hind 

 ends of 3-7 ; a transverse anteapical band on 1 (and in some also on 

 2) ; a narrow transverse basal ring on 3-7, confluent, at least in 

 younger specimens, with the blue of the sides ; nearly all of 8 and 9, 

 except for an inferior longitudinal black stripe on each side of each 

 segment. Segment 10 and the appendages as in gracile type. 



Legs black, inferior surfaces of femora and of tibiae pale (bluish?). 



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

 fore wings with 12-14 postnodals, 12 most frequent ; hind wings with 

 10-12 postnodals, 11 most frequent; M 2 arising nearest the fifth. 



