GROUSE DISEASE 203 



I took six Saw-fly larvae, eight caterpillars of 

 a Geometrid moth, one caterpillar of a smaller 

 moth, two small Tineid moths, and a number 

 of Hemipterous insects resembling the frog- or 

 cuckoo-spit, a fly, two specimens of plant-lice, 

 one small spider, and the remains of four slugs. 

 The gizzard of the same animal contained, in 

 a more broken-up condition, two or three dozen 

 larva of saw-flies and moths, some young Hemip- 

 terous insects, and the pupa of two true flies. 



In searching for the larval or cysticercus stage 

 of these and the other cestodes, we have ex- 

 amined a considerable number of insects which 

 occur commonly on grouse moors. We have 

 also carefully searched the bodies of many fresh- 

 water Crustacea which abound in the pools and 

 tarns from which grouse drink. But hitherto 

 our searches have met with no success. One 

 specimen of cestode which infests the common 

 fowl is said to have its second host in several 

 species of the slug Limax, but we have not suc- 

 ceeded in finding cysts of either form of tape- 

 worm in this slug. 



But besides the large tape-worm (Davainea 

 urogalli), which was described by Baird fifty- 

 seven years ago and the thread- or round-worm 



