146 
THIRTEENTH REPORT. 
THE ORTHOPTERA COLLECTED AT DOUGLAS LAKE, MICHI- 
GAN, IN 1910.* 
ALVALYN E. WOODWARD. 
All the Orthoptera collected at the University Biological Station in 
1910 were given to the writer for identification. For aid in identifying 
five species I am indebted to Prof. H. Osborn, of the Ohio State Univer- 
sity, and to Mr. A. N. Caudell, of the National Museum. Professor A. 
S. Pearse, acting director of the station, furnished tliruout the summer 
inspiration and aid in many ways, without which the work could not 
have been done. The description and keys are introduced for the con- 
venience of students at the station. 
Of the books referred to in the work, the following were found of the 
greatest help : 
Blatchley, W. S. — “The Orthoptera of Indiana.” Annual Report Indi- 
ana Department of Geology, 1901-2. 
Lugger, Otto — “The Orthoptera of Minnesota.” Annual Report of 
Entomologist, University of Minnesota, 1897. 
Hancock, Joseph L. — “The Tettigidea of North America,” Chicago, 
1902. 
Saussure, Henri I). — “Podromus Oedipodiorum Insectorum ex ordine 
Orthoptorum.” Memoir de la Societe de physique et d’historie natur- 
elle de Geneve, 1884. 
Scudder, Samuel H. — “Revision of the Orthopteran Group Melanopli 
(Acrididae), with Special Reference to North America Forms.” Pro- 
ceedings U. S. National Museum, XX . Washington, 1897. 
The Douglas Lake region is comparatively new country. There are 
small areas of virgin pine — hemlock forest, a few cleared farms, bogs 
of various ages, and, near the biological station, a great tract which was 
burned over about ten years ago, and which has grown up to poplars, 
birch, and brake fern. Near the lake is a bare beach. With the excep- 
tion of the loam in the bogs, the soil of the whole region is pure sand. 
As would be expected, there is not the usual variety of vegetation, only 
about 250 species of flowering plants being represented. Both the 
plants and animals are hardy forms, usually characteristic of high alti- 
tudes or latitudes. The birds and insects occur in very large numbers, 
but the variety of species is not correspondingly large. 
While an attempt was made to have the list of Orthoptera complete, 
the writer is not convinced that it is so, since five species not previously 
taken were collected during the last week of the season. Between July 
4 and August 28, thirty species were found, distributed through eighteen 
genera and ten sub-families. Camnula pellucida was the most numer- 
ous species. Dissosteira Carolina was probably second in abundance, 
♦Contributions from the Zoological Laboratory of the University of Michigan. No. 132. (Biol- 
ogical Station Series, Zoological Publication, No. 2). 
Submitted as a thesis for the degree Master of Science, University of Rochester, 1911. 
