Calvert : Odonata of the Neotropical Region. 169 



78. Acanthagrion truncatum. 

 (Plate V, fig. 87.) 

 Acanthagrion truncation Selys, Bull. Acad. Belg. (2) xli, p. 31 1. 1876. 



The following measurements, taken from a single male, are added 

 for comparison with those given for allied species : width of head 

 2.72 ; width of one pale postocular spot .24 ; maximum height of ab- 

 dominal segment 10 .72 ; height of abdominal segment 9 at base .72 ; 

 width of tip of dorsal process of 10, end view, .24 ; maximum width 

 of 10, end view, .56 mm. 



Twenty-five males and three females give the following data on the 

 origin of M on the hind wings : nearest the third postnodal, 24 per 

 cent. d\ 33^ per cent. 9 ; midway between 3d and 4th, 30 per 

 cent. d\ 33! per cent. 9 ; nearest 4th, 44 per cent, cj', 16J per 

 cent. 9 (1 hind wing 9 broken). 



Habitat : — Brazil, Chapada in May, by H. H. Smith, 12 c? and 

 and parts of 18 others, 1 9 and parts of 2 others; collector's 

 numbers 77, 77a, 78, 79, 119, 146. Carnegie Museum, Pittsburgh. 



Sete Lagoas, Minas Geraes, May, 1908, by J. D. Haseman, 1 $. 

 Carnegie Museum. 



Sao Paulo, September 14, 1900, by A. Heinpel, 3 d\ No. 304. 

 Academy of Natural Sciences of Philadelphia. 



79. Acanthagrion temporale. 



(Plate V, fig. 92.) 

 Acanthagrion temporale Selys, Bull. Acad. Belg. (2) xli, p. 312. 1876. 



d\ De Selys' description was based on a pair, the male of which 

 was imperfect. To fill up the gaps thus caused in his account, the 

 following notes are added : 



Abdominal segments 8 and 9 and the sides of 10 blue, dorsum of 

 10 black, its hind margin with the usual median semicircular excision, 

 the edges of which are elevated into a process having a truncated tip 

 when viewed from behind. 



Superior appendages directed strongly downward (ventrad) as well 

 as caudad, about equal in length to 10, when allowance is made for 

 their declined position ; in profile view slightly constricted at two- 

 thirds' length, again enlarged at the apex which is rounded and 

 slightly notched. 



Inferior appendages projecting caudad to the same level as do the 

 superiors, curved slightly upward and slightly inward at apex. 



