94 



ENTOMOLOGICAL SOCIETY 



of which bounds the Cornell University campus. Many failures 

 were made, but each failure showed another difficulty to over 

 come. The principal 

 difficulties were as 

 follows : roughness 

 of the surface of the 

 water, splashing of 

 water on the lens, re 

 flection from the sky 

 and lack of sufficient 

 light. The best neg 

 atives, from which 

 prints are here repro 

 duced, were secured 

 on a dark day. With 

 out doubt much bet 

 ter results could have 

 been obtained on a 

 brighter day. By 

 consulting Fig. 3, the 

 apparatus used can 

 be easily understood. The camera is the usual vertical camera 

 with a heavy iron tripod base. Between the upstream legs is 

 placed a glass bottomed box which is securely weighted down. 

 About a half inch of water was placed in the box. A focussing 

 cloth was held over the camera to cut out the reflection of the sky. 

 The photographs (Figs. 4 and 5) show fairly well how the nets 

 are built at the edge of a little irregularity of the rock surface. 



FIG. 3. Apparatus for photographing objects in shallow, 

 swiftly running water. 



Dr. Dyar presented the following note for publication : 

 NOTE ON ARACHNIS DILECTA BOISD. 

 By HARIUSON G. DYAR. 



In the Catalogue Lep. Phalaenae Brit. Mus. Hampson describes 

 the 9 only of this species. Mr. H. H. Newcomb brought to the 

 National Museum for identification a ^ Arachnis, captured in 

 Mexico, which is obviously the tf of A. dilecta. It differs from 

 the 9 in having the disk of the hind wings white, the crimson 

 ground color being confined to the costal and internal margins. 

 This sexual difference is exactly as in the allied A. zuni Neum. 

 from New Mexico, but in that species the ground color is yellow 

 instead of crimson. 



The first paper was by Mr. Ash mead and was entitled 

 " Notes on some South American Chalcidoidea." He stated that 

 it was now fifteen years since he first undertook to work up t'he 



