Natural Sciences of Philadelphia 
53 
tidae has been partially studied by him, and very satisfactory ar¬ 
rangements made with the Paris Museum for the retention of a 
large part of the series. Very important exchanges with the 
British Museum of Natural History have been negotiated by him, 
which added numerous genera to our collections. He has secured 
by purchase, and otherwise, important collections of Orthoptera 
from Peru, Venezuela, Bolivia, Katanga in the Belgian Congo, 
British India, Philippines and China. 
Papers published during the year by Mr. Rehn are: Descriptions 
of New and Critical Notes upon Previously known Forms of 
North American Oedipodinae. Paper II. (In: Trans. A. E. S., 
27 pp. 2p 1 s.) Studies in Costa Rican Dermaptera and Orthop¬ 
tera. Paper I. (In: Trans. A. E. S., 12 pp. 1 pi.) Contribu¬ 
tions to our Knowledge of the Dermaptera and Orthoptera of the 
Transvaal and Natal. Part I. Dermaptera and Blattidae. (In: 
Annals of the Transvaal Museum. 99 pp. 4 pis.) 
By Morgan Hebard: Mexican Records of Blattidae. (In: Trans. 
A. E. S., 22 pp. 1 pi.) South American Blattidae from the 
Museum National d Histoire Naturelle, Paris, France. (In: Proc. 
Acad. Nat. Sci. Phila., 112 pp. 7 pis.) The Janeirensis Group of 
the Genus Euborellia, etc. (In: Trans. A. E. S., 6 pp. 2 pis.) 
The Dermaptera and Orthoptera of Hawaii. (In: Occas. Papers 
Bernice Pauahi Bishop Mus., 72 pp. 2 pis.) New Genera and 
Species of Melanopli found within the United States and Canada 
Part IV. (In: Trans. A. E. S., 28 pp. 2 pis.) Notes on a Few 
Interesting Blattidae from Guatemala, with the Description of a 
New Species. (In: Trans. A. E. S., 4 pp.) North American Acri- 
didae. Papers I, II. (In: Trans. A. E. S., 20 pp. 1 pi.) 
Many entomologists have consulted the collections during the 
year, and much assistance has been given local students and 
school children in the identification of specimens. 
Specimens were loaned to B. Uvarov, and Morgan Hebard. 
Plants 
During the early part of the year there was prepared a complete 
inventory of the collections of the Academy on hand and as yet 
unmounted. For the general herbarium over thirty collections 
from various sources have been mounted during the year, repres¬ 
enting a total of over 6000 specimens. We have vast collections 
