32 University of Michigan 



2O00 feet; Rio Guapiles; Philadelphia South Farm; Alajuela, 

 3100 feet; Ouebrada de Salas, Atenas Station; East of La 

 Emilia ; small stream north of Turrucares ; April, June and 

 August to December, inclusive, 1909 and 19 10, a teneral in 

 December, a pair in August and October, remarks "creek in 

 woods", "brook in shade", "more open part of quebrada"; 

 a total of 23 males and 10 females all collected by and in the 

 collection of P. P. Calvert : Canal Zone, Rio Sardanilla, De- 

 cember 5, 1916, 27 males and 3 females, Chas. T. Tribolet and 

 E. B. Williamson, collectors, coll. E. B. W. : Colombia, Crist- 

 alina, Department of Antioquia, February 12 to 20, 1917, 135 

 males and 8 females, J. H. and E. B. \\'illiamson, collectors, 

 coll. E. B. W. 



16. Hctcragrion alhifrons Ris 



Figures 2, 32, 33, 61, 72, 86, 87, 148, 149 

 This species has recently been described by Ris (8) from a 

 single male from Reventazon, Costa Rica. The species is 

 represented in Dr. Calvert's Costa Rican material by the fol- 

 lowing specimens: Peralta, August 9, 1909, in low woods, one 

 male; Turrialba, 2300 feet, July 26, 1909, 10 males, 3 females; 

 Guapiles, forest, June 2, 1909, pair; Juan \^inas, 2500 feet. 

 May 3, 1910, I female; Reventazon A'alley. Juan A'inas, July 

 23, 1909, 2 males, i female; Reventazon A^alley, below Juan 

 Vinas, 2500 feet, June 28, 1909, 2 males; Reventazon road, 

 Juan Vinas, 2500 feet, stream in forest, April 28, 1910, i male. 

 This is the Heteragrion referred to by Dr. Calvert (6) on 

 pages 228 and 251, and probably page 192. The male from 

 Cachi, Costa Rica (Calvert 3), referred to eryfhrogastnini, 

 and the female from the same locality, questionably referred 

 to cJirysops (Calvert 3), are also very probably this species. 



This is one of the handsomest species of the genus. It 

 seems to me the name is not very appropriate as the male, to 



