14 E. B. Williamson v 



The elevation of the three Guatemalan localities mentioned are, moreover, 

 above the apparently optimum habttats of species of Erythemis (due prol>- 

 ably rather to the relative absence of such pools as occur at lower levels 

 than to elevation itself), and it may be noted that on February 5, 1905, we 

 found the species at sea level at San Jose, Guatemala. 



Attala is an active species in a genus of generally active species, and at 

 times individuals are seen whose incessant activity and wariness effectually 

 prevent their capture. It is a matter of common observation among strong- 

 flying species of dragonflies that in an assemblage of only a few individuals 

 of a species such individuals are much more wary of the collector than indi- 

 viduals in a numerous assemblage when their attention is largely given to 

 each other, and the collector finds their capture less difificult. This will often 

 explain the extreme wariness of atfola which, as stated above, has not been 

 noted as very numerous about any particular habitat in Colombia or 

 Venezuela. 



2. Brythcmis cannclita Williamson. Colombia: Rio Neuvo, (5, 6), Jan- 

 uary 22, 1917; El Banco, (i, 4, 5, 6, 7), January 23-25, 1917. Venezuela: 

 Tucacas, (5, 6, 7), March 2t„ 1920. See description of this species in this 

 paper for further notes. 



3. Erythemis credula Hagen. Panama: Gamboa, Canal Zone, (6), 

 August 5, 1920, J. H, Williamson. 



Credula is apparently, next to carmelita, the rarest species of the genus 

 and J. H. W.'s record for Panama is the first for Central America. I have 

 seen the species alive at only one locality, Pitch Lake, Trinidad, where the 

 males were flying about the small pools of water in the pitch. 



4. Erythemis Jmcmafogastra ^urmeistev. Colombia: Rio Frio, (5,6,7), 

 January 8, 191 7; Sevilla, December 15, 1916; Fundacion, (i, 5, 6, 7), Jan- 

 uary 12 and 13, 1917; El Banco, (i, 2, 5, 6, 7), January 24 and 25, 1917; 

 Puerto Berrio, (5, 6), January 8 and February 21, 1917. Venezuela: El 

 Guayabo, (5, 6, 7), April 20, 1920. 



Bates, as recorded by Ris, notes : "Rather common species at Santarem ; 

 it frequents only the shade of the woods and settles frequently on dried 

 twigs. Banks of brooks, Para, not uncommon." So far as I have observed, 

 this species is rare, being found usually only as a solitary individual sunning 

 itself on some twig or broad leaf near or far from water. In fact, the total 

 Colombian- Venezuelan catch numbers only fifteen specimens, nine males and 

 six females; the number of specimens taken at each locality varies from one 

 to three, except at El Banco, where five specimens were collected. 



5. Erythemis mithroides Brauer. Colombia: Santa Marta, (7). Decem- 

 ber 19, 1916; Rio Frio, (4, 6, 7), January 7, 1917; Fundacion, (i, 4, 6, 7), 

 January 13 and 14, 1917; Bolivar, (6, 7), December 20, 23, and 26, 1916; 

 Rio Neuvo, (2, 6), January 22, 1917; El Banco, (i, 2, 4, 6, 7), January 

 23-25, 1917; Puerto Berrio, (4-6), January 30, 1917. Venecucla: Tucacas, 



