Natural Sciences of Philadelphia 
25 
Messrs. W. L. Sclater, of London; W. B. Alexander of Western 
Australia; Mr. A. Haagner of South Africa have visited the depart¬ 
ment during the year; and many American ornithologists have 
made use of the collections. 
Reptiles and Fishes. 
Mr. H. W. Fowler in charge of these collections has cared for 
the numerous accessions received during the year, and has deter¬ 
mined and labelled most of them. 
An extensive report on the fishes of the U. S. (Wilkes) Explor¬ 
ing Expedition to be published by the U. S. National Museum was 
completed during the year, and a paper on local fishes obtained dur¬ 
ing 1919 was published in the Proceedings of the Academy. 
Local collecting trips were taken during the year to various points 
in Pennsylvania, Delaware and Maryland. 
Mollusca. 
The collection of Mollusca has received numerous important 
accessions largely from material sent for study and identification 
to the Curator, Dr. H. A. Pilsbry, from which the Academy has 
been given duplicate series. Among the most important collections 
are those from South Africa, from H. C. Burnup; from the Belgian 
Congo, from the American Museum of Natural History; and many 
lots from various parts of the United States, especially the J. H. 
Ferriss collection from northern Arizona, the J. B. Clark collection 
from Florida, Delaware, etc. The preparation of the Pupillidae 
for the “Manual of Conchology” has been continued during the 
year by Dr. Pilsbry, the subfamily Vertigininae being completed; 
various papers on the shells of Central America, Hawaii, and Haiti, 
have been published by him, and by Mr. E. G. Vanatta. 
Insects. 
Dr. Henry Skinner, head of the Department of Insects, reports 
that nearly 19,000 specimens have been added to the collections 
during the year. Practically all of his time has been taken up 
with the care and determination of the accessions of Lepidoptera, 
and in preparing reports on certain of the collections, besides im¬ 
portant field work accomplished in the Sierra La Sal, Utah. 
In the Hymenoptera, Mr. E. T. Cresson, Jr., has completed the 
determination and marking of the types. In the Diptera he has 
