73 



the digestive tract entirely empty; and of the 294 Pantala, 70 

 had in their alimentary canal no traces of animal remains, being 

 either entirely empty or containing some mud, gravel or algae. 

 There were then left in all 253 specimens whose digestive tract 

 contained some kind of animal remains. 



The following list gives the different kinds of animal life 

 preyed on by dragonfly nymphs as represented in the contents 

 of the digestive tract of the 253 Anax and Pantala nymphs dis- 

 sected. The figures in the table represent nnits, or the number 

 of times a certain species or group appeared in the series of dis- 

 sections ; that is, each distinctive species or group of animal, as 

 classified in the table, whether found in large or small quanti- 

 ties in the contents of a single digestive tract, is given the value 

 of one unit. 



TABLE SUOWIXd TIIK FIXDIXGS IX THE CONTEXTS OF TILE ALI- 

 ,^[EXTARY C'AXAL OF 253 XYMPIIS. 



CoLEOl'TERA 



Di/tisci(I<i<:'. the smallest of the three sps 16 



DiPTEEA 



Chironomidae 



Chironomus hairaiiensis, larvae 1G7 



Chironornus liawaiiensis, adults 4 



Chironomid larva, undetermined 1 172 



C'uUcidac 



Mosquito larvae and pupae 12 



Mosquito adult 1 13 



DuJu'hopodidac 1 



Adult fly, undetermined 1 1S7 



Hemipteka 



Myodoch idae 



M-erragata liehi-oides White 1 



Gery'idae 



Min-orrlia rnr/ans AVliite 2 3 



