136 [Jnne. 



in which a strong nest of large ants was housed. We had no proof of 

 it, but imagined the moths were associated with the ants rather than 

 with merely the rotting wood of the tree. 



We returned home by the Pluela Pass and spent one day at 

 Davos. So far as our brief experience went we thought it a much 

 more desirable place for a stay than we had expected — expectations 

 founded on a tramp through it many years ago, and the general idea 

 that it was a winter sanatorium simply. We went to the top of 

 the Dischma Thai, separated from the top of the "Fluela Pass by a 

 comparatively narrow ridge, of which the Schwarzhorn is the principal 

 point. At the entrance of the valley we found Arqynnis Ino in pro- 

 fusion, further up we saw HJrehin Sti/gne ; E. Gorge was fairly common, 

 and Mnestra occurred very freely ; Tyndarna and Melnmjms were 

 veritable pests, rising from the road in swarms as we went along ; 

 Fjurynle was fairly common ; further up Argjpinis Pales and Amnthiisia 

 were common, and a large form of M. Merope, almost aurinia, was 

 frequent. Towards Durrenboden C. Palceno, P. Delius and Srebin 

 Epiphron were flying freely. Lifccdnn Alciphron and Gordius were 

 frequent, P. Optilefe was common, and Arqiis, Pherefes, and several 

 others were passed over as unworthy of attention. 



Betula, Eeigate : Felruarij, 1901. 



ON SOME GEOMETRIDES FROM THE GRISONS COLLECTED BY 

 DR. T. A. CHAPMAN IN 1900. 



BY LOUIS B. PROUT, F.E.S. 



With his customary generosity, my good friend Dr. Chapman has 

 presented me with the collection of Geometrides which he made in 

 Switzerland in July and early August of last year, and the following 

 note is the result of my investigation of them. 



Pontresina and Guarda were made head-quarters, and collecting 

 done often several miles off, up or down. The elevation of both 

 centres is about 5500 ft. ; collecting was done for the most part at 

 higher levels, generally about 7000 ft., but of course there were many 

 exceptions. 



From Pontresina, July 1st to 21st, came the following 32 species, 

 representing eight of the "genera" of Staudinger's "Catalog," just 

 half the species belonging to his comprehensive genus " Cidaria " — 

 so well represented in northern and alpine localities. 



