Vol. xxii] ENTOMOLOGICAL NEWS 51 



are each [a fifth] as long as the short 'pudgy' body, the effect 



is to give the larva the appearance of 'tail-heavy.' When first 



taken into the hand these three larvae remained motionless, 



'playing 'possum' as it were for a minute or two, and then 



took to their legs with some speed. In spite of their double 



equipment of gills, the Cora (?) larvae found do not frequent 



a different abiding place from less richly 'engilled' dragons, 



their fellow inhabitants being larvae of Hetaerina, Argia and 



common types of Libellulinae." The ditch in which these 



larvae were found was at this time one to two feet wide and 



rarely as much as eight inches deep ; it contained many small 



stones on the under sides of which the larvae were found. The 



waterfall, whose outflow it was, was perhaps thirty feet high and 



was in turn fed by a stream descending in occasional cascades 



through forest from a height of several hundred feet higher. 



We took or saw images of Cora chirripa at this waterfall in 



different months, at previous visits, and on April 30 and May 



2, 1910. The altitude at which all the Cora larvae from Juan 



Vinas were found was about 1000 meters, or 3300 feet. 



On April 30, 1910, Mrs. Calvert went from Juan Yinas to 

 our headquarters at Cartago, taking with her the Cora larvae 

 of April 27 and 29, and placed them in our rearing jars. I 

 followed on May 4 with the three larvae of May 2. At 6:50 

 P. M. of the same day occurred the great earthquake which 

 destroyed Cartago. Its effect upon our larvae in rearing has 

 been briefly described in the NEWS as quoted, but by the great- 

 est good fortune the bottle containing the Cora larvae of May 

 2 was the single one of all our living Odonata that rolled 

 out and escaped destruction from the fallen wall. Two of the 

 larvae were alive and were carried in safety to our steamship at 

 Port Limon. A second died May 7, and the third, with a 

 supply of mosquito eggs to furnish food, started with us on the 

 voyage to New York, but expired on May 14, three days be- 

 fore we landed. Each larva, as soon as its death was discov- 

 ered, was placed in alcohol, but evidently was not in a condition 

 for histological study. This fact must be remembered in judg- 



