XXXI, '20J ENTOMOLOGICAL NEWS 253 



Studies on Costa Rican Odonata, 



IX, Sympetrum, with Description of a New Species, 



By PHILIP P. CALVERT, University of Pennsylvania, Phila- 

 delphia, Pa. 



The only Sympetrum recorded from Costa Rica in the 

 Biologia Centrali- Americana is 5. illotum virgula, specimens 

 of which were examined from San Jose, San Francisco and 

 from an altitude of 6000-7000 feet on Irazu. Dr. Ris, in 

 the Catalogue, Collections Zoologiques . . . Selys* and in 

 his Libellen (Odonata) aus der Region der amerikanischen 

 KordiUeren von Costarica bis Catamarca,\ has neither added 

 any Costa Rican data for this form nor increased the number 

 of species of Sympetrum from that country. 



In the course of the year May I, i9O9,-May 10, 1910, we 

 observed Sympetrum illotum in Costa Rica at Cachi, Paraiso, 

 Cartago and vicinity, Laguna Ochomogo, on the mountain 

 Carpintera, near Tres Rios and at Alajuela. These seven 

 localities represent a range in altitude from 985 to 1600 

 meters (3230-5250 feet).J For the vicinity of Cartago, 

 including San Isidro del Tejar, our notebooks record its 

 appearance in every month except December and January 

 (during the latter of which we were absent except for short 

 visits by one of us), transformation to the imago on Septem- 

 ber 20, October 30, 31, November 12, 21, 29, and oviposition 



*Fasc. XIII. Libellulinen, p. 677, Bruxelles, 1911. 



fArchiv f. Naturges. 82 Jahrg., Abt. A, 9 Heft., p. 180. Berlin, 1918. 



JDetails as to altitudes, localities, etc will be found in "A Year of Costa 

 Rican Natural History" by A. S. and P. P. Calvert, New York, Mac- 

 millan, 1917. 



I have also one male, intermediate between i. illotum and /. virgula, 

 sent by Mr. C. H. Lankester with specimens taken near the Rio Jesus 

 Maria, on the Pacific slope, April 2-4, 1918. The altitude of this locality, 

 less than 100 meters, is much below that in which this species has been 

 observed elsewhere in Central America or Mexico. The specimen has 

 been submitted to Mr. Lankester, who writes that it "conveys no memory 

 of capture." The envelope in which it was originally sent to me is part 

 of a printed page, another piece of which contained an Erythrodiplax con- 

 nata whose occurrence at Rio Jesus Maria there is no reason to doubt. 



