50 H. B. Williamson 



had ceased to flow. At this stream and nowhere else have we found 

 membranalis and Staurophlebia associated. 



As Ris (36) points out, G. jubilaris Navas is a synonym of inemhranalis. 



Material examined: Costa Rica, Guacimo (in forest, I'. P. Calvert, June 

 6, 1909, I male, A. N. S.), Alajuela (D. E. Harrower, August 2. 191 5, 

 I male, A. N. S.) ; Panama (Hassler, i male, M. C. Z.) ; Colombia (Appun, 

 I female, M. C. Z.), Sta. Fe de Bogota (Lindig, i male, M. C. Z.), Rio 

 Negro, East Colombia (A. H. Fassel, 1911, i male, 800 m., i female, 500 m., 

 Ris) ; Bolima, Prov. del Sara, 450 m. (J. Steinbach, t female. Ace. 4547, 

 Carn. Mus.) ; Peru, Iquitos (i female, M. C. Z. ; W. T. M. Forbes, August 

 4, 1920, I male. Cornell); Venezuela (Appun, i male, M. C. Z.), San 

 Esteban, Dept. Carabobo (February i, 6, 8 and 9, 1920, 3 males, 9 females, 

 E. B. W.), La Fria, Dept. Tachira, 140 m. (April 12. 13, 15, 18 and 21, 

 1920, 3 males, i female, and i male and 3 females by H. B. Baker, E. B. 

 W.) ; British Guiana (i male, Cornell), Bartica (H. S. Parish, May 15. 

 1901, I male, O. S. U.), Rockstone, (February 2. 1912, i male, E. B. W.) ; 

 French Guiana, Tamanoir, Mana River (S. M. Klages, May. 1917, 2 males, 

 I female. Ace. 6008, Carn. Mus.) ; Brazil Benevides, Para (S. M. Klages, 

 October, 1918. i male, i female. Ace. 617/], Carn. Mus.). 



Note 



In the U. S. N. M. is a male Gynacantha labelled Crowley, Louisiana. 

 July 17, 191 1, E. S. Tucker, collector. This is very close, if not identical 

 to the widely distributed oriental (7. hyalina. Miss Currie feels certain 

 the locality label is correct. Mr. Tucker has no recollection of the specimen. 

 If it was really taken in Louisiana it is probable it was brought to this coun- 

 try as an egg or larva and it is improbable that an undescribed Gynacantha 

 inhabits Louisiana. 



Bibliography 



The following papers not cited in Kirby's Catalogue have been con- 

 sulted in the preparation of this paper. Numbered titles contain references 

 to American species. Unnumbered titles contain more general references 

 to genera or to other than American species. 



C. S. Brimley 



1. Notes on the Odonata and Other Insects of Lake Ellis, North Carolina. 

 Ent. News, March, 1906, pp. 81-85. 



HoRTENSE Butler 



2. The Labium of the Odonata. Trans. Am. Ent. Soc. XXX. 1904, pp- iii-i34. 



Philip P. Calvert 



3. Burmeister's Types of Odonata. Trans. Am. Ent. Soc, XXV, 1898, pp. 27-104. 



4. Odonata from Tepic, Mexico, with Supplementary Notes on those of Baja, 

 California. Proc. Cal. Acad. Sci., I, 1899, pp. 371-418- 



