Hagen.] 96 [May 19, 



3. Diastatops pullata, d". 



Libellula pullata Burm.! Handb., n, 854, 34. 



Diastatops pullata Ranib. ! Neuropt., 13G, 2, pi. 3, f. 4. — Hag.! 

 Syn., 321. 



Hab. Pernambuco, Brazil; Moxos, Peru. 



4. Diastatops obscura, d", ?. 



Libellula obscura Fabr., Ent. Syst, II, 377, 15. — Burin.! Handb., 

 II, 584, 35. 



Diastatops fuliginea Ramb.! Neuropt., 137, 3. 

 Diastatops obscura Hag. ! Syn., 321. 

 Hab. Bakia, Brazil. 



Prof. W. H. Niles remarked on the comparative whiteness 

 of the snow at different seasons of the year. He thought 

 that the snow was observably whiter in the spring than in 

 the earlier parts of the winter, and attributed the difference 

 to the character of the snow-crystals as those seasons. 



Prof. P. H. Pichards described some peculiar forms of ice- 

 crystals, formed at a very low temperature in a barrel con- 

 taining salt water. 



May 19, 1875. 



The President in the chair. Thirty-eight persons present. 



After the usual preliminary business, the President, intro- 

 ducing Prof. Rogers, said : — 



I know that you all have observed with great pleasure the 

 presence with us this afternoon, after long absence from ill- 

 ness, of our distinguished, highly valued, and I may add 

 much beloved, brother member Wm. B. Rogers ; and as it 

 seems to me meet on this occasion that the feelings that 

 move every heart should be openly expressed, I venture in 

 your behalf to tender him your congratulations upon that 

 restoration to health which permits him once again to take 

 part in our proceedings; and to express the hope that he 



