BIBLIOGRAPHY. 
A complete bibliography of the writings on the order Trichop- 
tera is far beyond the scope of the present work. For more com- 
plete references to the literature the student is referred to “Die 
Trichopteren-Literatur von 1903 (resp. 1907), bis Ende 1909,” 
by Georg Ulmer, Zeitschrift ftir wissenschaftliche Insektenbi- 
ologie, 1911 and 1912. This work reviews all writings on the 
order that appeared during the period between 1903 and Igog. 
A more lengthy bibliography of the Trichoptera of the world 
appears in ‘Genera Insectorum,” Ulmer, 1907. 
Bibliographical references to the adults of the American fauna 
will be found in “Catalogue of the Neuropteroid Insects of the 
United States,” by Nathan Banks, American Entomological So- 
ciety, 1907. 
A bibliography of the more important works is contained in 
“Studies on the Trichoptera of Wisconsin,” by Charles T. Vor- 
hies, Transactions of the Wisconsin Academy of Sciences, Arts, 
and Letters, 1909. 
The most important key to the North American Trichopterous 
larve, Krafka, 1915, is quite satisfactory for determining most 
species to the family or subfamily, but makes no attempt to classify 
genera and species. 
A number of authors have published more or less on the habits 
of caddis-worms. No doubt the most important of these is the 
work of Dr. Vorhies, 1909, in which are described the immature 
stages of nineteen species, with careful notes on their habits. 
Preceding the work of Dr. Vorhies, Miss Cora H. Clarke 
published two articles, 1882 and 1901, in which she described and 
figured the cases of more than twenty species. Many of the de- 
terminations in this article go no farther than the genus, and 
sometimes no attempt at classification is made. The figures of 
the cases are good and many accurate notes on the habits of the 
larve accompany them. That the author used more than usual 
care in observing her specimens is shown by her figure of the 
respiratory grating of the case of Neophylax (unnamed in her 
article) and her mention of the “spinnaret” of the larva ‘‘Plec- 
tronemia.” Without doubt this was a species of Phylocentropus. 
120 
