Calvert : Odonata of the Neotropical Region. 163 

 70. Acanthagrion gracile Rambur. 



Acanthagrion gracile Calvert, Biol. Centr.-Amer. Neurop. pp. 115, 382, pi. v, fig. 



20. 1902, 1907. 



Venezuela, Caracas, by R. M. Bartleman, 1 9. U. S. National 

 Museum. 



Habitat : — Brazil, Bom Fim, State of Bahia, at a small pond in 

 city, November 2, 1907, 2 d\ and at Fazenda de Amaratu, Nov. 21, 

 1907, 1 J 1 , 1 9, by J. D. Haseman ; Rio de Janeiro, November, 3 

 c? and parts of 2 others, and Desterro, part of 1 d\ by H. H. Smith. 

 Carnegie Museum, Pittsburgh. 



Sao Sebastiao, November 1, 1900, by A. Hempel, icT i9. Acad- 

 emy, of Natural Sciences, Philadelphia. 



Paraguay, Sapucay, January 27, 1903, by W. T. Foster, 1 9 with 

 males of gracile minarum. U. S. National Museum. 



Argentina, Sta. Helena, east side Rio Parana, December 21, 1 

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



71. Acanthagrion gracile minarum. 



Acanthagrion gracile race? minarum, Selys, Bull. Acad. Belg. (2) xli, p. 309. 

 1876. 



In the Biologia Centrali-Americana, Neuropt., p. 382, record is made 

 of specimens from Central America having abdominal segment 7 black 

 at the hind end, consequently resembling gracile minarum. Compar- 

 ing what on inspection seemed to be average specimens with 7 so 

 colored, I obtained the following measurements in millimeters : 



Surubres, Gualan, Guat- Chapada, 



Costa Rica. 

 (i) Width of head. 3.16 



( 2 ) Width of one pale postocular spot, 

 measured at right angles to longi- 

 tudinal axis of body. .6 



Ratio of (2) to ( 1). .19 



(3) Maximum height of abdominal 



segment 10 in profile view. 1. 28 1.2 .88 



(4) Height of abdominal segment 9 at 



anterior end. .76 .88 .72 



Ratio of (3) to (4). 1.68 1.36 1.22 



For further comparison with the data given in the Biologia, I. c, 

 for the examples from Gualan and Surubres, fifteen males of gracile 

 minarum from Chapada, abdomen 21.5-24.5, hind wing 13. 5-1 5 

 mm., give the following numbers of postnodals : on the front wings, 



emala. 

 3-36 



Matto Grosso. 

 2.48 



•5 

 .148 



.36 

 •145 



