Zoology. 71 
(3.) The westward spread of the species was hastened by its spread- 
ing from colonies established at Indianapolis in 1874, and at Chi- 
cago in 1875. (4.) The species has reached the natural limit to its 
southern extension. This is shown by the fact that it can hardly 
maintain itself at Apalachicola and has not pushed its way into the 
peninsula of Florida beyond, hardly to, Jacksonville, although it 
has for ten years been within what would elsewhere be not more 
than a year’s flight away. 
On THE SYSTEMATIC POSITION OF THE MaLLopHAGA.—Dr. 
Packard reviews! our knowledge of the structure of the Bird-lice, 
and compares them with the Pediculide and with the Psocide. He 
concludes that the Mallophaga are nearest allied to the Psocide, 
and are degraded members of the order to which the Psocide 
belong. He divides his order Platyptera into two sub-orders :— - 
NTOMOLOGICAL News.—Mr. S. H. Scudder published in the 
Canadian Entomologist for November “ Comparative Tables for 
the Families of Butterflies.” The characters of the families are 
given at great length, and include every stage of life. Bulletin No. 
3 of the State Entomologist of Illinois is a Contribution to a 
Knowledge of the Life-History of the Hessian-fly, by S. A. Forbes. 
A list of the entomological writings of Dr. A. S. Packard, with a 
systematic and general index, prepared by Mr. Samuel Henshaw, 
forms Bulletin No. 16 of the division of Entomology of the U. 8. 
Department of Agriculture; 339 titles are enumerated. 
ZOOLOGY. 
CONTRIBUTION TO THE FRESH-WATER Rurtzopops.—During 
the last season some investigation was made for Rhizopods to 
a this important group of animals before my pupils in 
ogy. 
Gatherings, from sphagnum swamps, the ooze of springs, ponds 
and sheltered coves along the Penobscot River near Orono, were 
examined, 
By consulting Dr. Leidy’s Rhizopods of North America the 
following species were determined. 
1 American Philosophical Society, September 2, 1887. 
