hymenoptera: alysid^. 25 



quantity of food, more or less digested, in which 3 cyclops, 2 Csecidotea 

 stygia, one about 4 mm., the other about 2 mm. long, and parts of other 

 Csecidotea were recognizable. Material taken from the stomach of an 

 Amblyopsis from Mitchell contained 12 Crangonyx gracilis and 7 Cieci- 

 dotea stygia. The amphipods ranged from 8 mm. to less than 4 mm. in 

 length. The Csecidotea were 6 mm. long or shorter. Eigenmann has 

 found larger amphipods in the stomach of Amblyopsis from Mitchell. 

 Putnam (1872, 24) found crayfish in the stomachs of blind fish from 

 Mammoth Cave, presumably A. spelxus, as he speaks of examining a 

 number of that species. Sloan and also Eigenmann (1899c?, 481) have 

 known large blind fishes to swallow smaller ones, and Wyman (cf. 

 Putnam, 1872, 13, pi. i) found a small eyed fish in the stomach of an 

 Amblyopsis. 



Cladocera or Copepoda, if placed in an aquarium with blind fishes, 

 soon disappear. I have fed Amblyopsis bits of beef, which are some- 

 times readily taken if moved about in front of or just above the head. 

 It was necessary for the bait to be kept in motion in order to be seized, 

 no notice being taken of the meat when not moving. Amblyopsis takes 

 food with a very quick movement, which suggests that it would have no 

 difficulty in capturing Crangonyx and Csecidotea. 



The blind fish apparently restricts the numbers of Crangonyx gracilis 

 and Csecidotea stygia in Mayfield's Cave. In the first and largest pool, 

 where there are always a number of Amblyopsis, the Crangonyx are 

 very scarce, and I have seen only a few smaller ones. The Csecidotea 

 also are much less abundant in the large pool than in the upper pools, 

 although very abundant in the shallow parts of the stream near by. 



INSECTA. 



Order HYMENOPTERA. 



Family PEMPHREDONIDAE. 



Three specimens of two species of wasps which I refer to this family 

 were taken within the cave. February 27, 1904, just within the cave, 

 one was found crawling slowly along on the wall. A second was taken 

 April 15 in about the same locality, and a third April 28, just past the 

 first turn, where it was rather dark. It seemed to be crawling out of a 

 crack and was headed toward the light. During March another was 

 seen on the ledge of rock just outside the mouth of the cave, from 

 which it apparently had come. Some of these wasps may spend the 

 winter in the cracks and recesses just within the cave. 



Family ALYSIDAE. 



A small hymenopterous insect of this family was taken on the wall 

 at "12" in November, 1903. It was without question a stray. 



