hungerford: aquatic hemiptera. 245 



Corixids Added The first two Corixids added refused to eat the stuff, 

 although when placed in 17129A they began feeding promptly enough. 

 After the material was cold and had been repeatedly washed, the bugs 

 foraged upon it. The stomachs contained very finely divided brown 

 matter with no animal remains. In this culture no rotifiers and the like 

 had had any chance to develop. The brown grindings, only the finest of 

 them, were swept in directly. 



Culture 16220 (Alfalfa base culture.) 



History and Diagnosis Doctor Embody had a large circular aquarium 

 in which he had placed ground alfalfa and a little manure. The culture 

 had reduced itself to a spongy mass in the bottom and the water was 

 fairly clear, with duckmeat growing on top. The plant life is largely 

 Oscillatoria, diatoms, etc. present also. 



Corixids Added. Bugs were kept here for more than a month, and 

 did very well. Their stomachs were always full of dark green material, 

 which often consisted of great skeins of Oscillatoria filaments and little 

 else. In some of them this blue-gi'een could be traced from fresh 

 material in the fore part of stomach to broken up, disorganized particles 

 in rectal pouch. 



Culture C. (Bran.) 



History and Diagnosis. Ground-up bran. 



Added Corixids. This experiment was not a success at all. Fer- 

 mentation made life untenable for the bugs. 



Culture 16221. (Euglenas.) 



History and Diagnosis. A large rectangular aquarium. The bottom 

 contained sand and the aquarium had been in use a long time. A green 

 growth covered the sides and bottom. The water itself was green, due 

 to millions of Euglenids! 



Corixids Added. A great many Corixids were placed here and after- 

 wards examined. Their stomachs were packed green with Euglenids and 

 little else! . 



Culture 179. (Largely Mougeotia.) 



History and Diagnosis. A large aquarium jar had been sitting be- 

 neath a constantly running tap. It contained quantities of oozy material, 

 having a brownish tinge. This consisted of diatoms, Scenedesmus, Gleo- 

 capsa and Mougeotia filaments. The last the dominant organism. 



Corixids Added. Examination of Corixids after feeding here proved 

 that they were consistently gathering the Mougeotia after their stomachs 

 were packed with it. 



Culture 17143. (Mougeotia.) 



History and Diagnosis. Placed sand in the bottom of a large rec- 

 tangular glass jar. Added some green material from a jar in Doctor 

 Embody's office, 



Corixids Added. After a couple of weeks added a number of fifth- 

 instar nymphs of P. buenoi and some adult A. altemata. After a couple 

 of days examined the stomach contents of the bugs. In every case the 



