380 ENTOMOLOGICAL NEWS. [Oct., 



C 



Dr. Calvert remarked that the highest altitudes in Costa 

 Rica from which Odonata were recorded in the Biologia Cen- 

 t rali- Americana were 6000-7000 feet, the specimens from 

 Irazu by H. Rogers (1877) in Dr. F. D. Godman's collection 

 being so labeled. During the year which the speaker spent 

 in Costa Rica, he had sought repeatedly for these insects at 

 higher altitudes, especially on three visits (July and September, 

 1909, March, 1910) to the summit of Irazu (11,300 feet), but 

 had not seen any Odonata at a greater height than about 6450 

 feet, near the village of Tierra Blanca. On July 13, 1909, he 

 had visited the Laguna del Reventado, or Laguna del Dirumbo, 

 at an altitude of 9100 feet on the southwest slope of Irazu, and 

 although the locality and weather seemed favorable, not a 

 single dragonfly was seen there. In July, 1910, Prof. J. Fidel 

 Tristan was at this laguna and soon after wrote that he had 

 seen "three big dragonflies flying on the laguna. They were 

 of a dark color and I tried to catch them, but my efforts were 

 not enough." 



A still later letter from Prof. Tristan, dated May n, 1911, 

 was read by the speaker as follows: "On the I2th of April 

 I went up to Tierra Blanca where I spent several days. 

 From Tierra Blanca I went up to Reventado 

 twice and spent all the clay collecting. The first day I went 

 directly to the pond and remained there several hours. I 

 looked with interest for the dragonflies and also I examined 

 the roots and aquatic plants but I was unable to discover any 

 insect or any larvae. From the pond I went along the river 

 Reventado but the rain and the mist obliged me to go back. 

 The second day I went again ; the day was very clear but no 

 insects were flying. I returned early and I left the narrow 

 road and entered in the forest on the west side very near the 

 old crater where in a small rivulet I discovered only one 

 pipilacha.* As the place is very high I thought it was inter- 

 esting to you and, of course, I tried to collect more but in the 

 rest of the day (five hours) no other one was seen. Here is 



^Native Costa Rican name for Odonata. P. P. C. 



