( 
species, dates of occurrence, and the like, and have been exten- 
sively used in the preparation of this paper. Such are those of 
the late Dr. Kellicott (95, “96, 97a); of Miss Wadsworth (90) 
and Mr. Harvey (91a) for Maine; of Calvert, Banks, and Van 
Duzee for New York; of Calvert for Virginia and the vicinity of 
Philadelphia ; of Williamson (’00) for Indiana ; and of Elrod for 
Iowa, and Banks for Kansas. The above localities are not far 
from our own latitude, and the data given are presumably quite 
close to the normal for Illinois. 
Among Illinois contributions to this subject we may men- 
_ tion the elaborate papers (°62, °63) of our pioneer entomologist, 
Mr. B.D. Walsh, who listed sixty species occurring about Rock 
Island, describing a number as new: a list of dragon-flies 
taken at Kensington, IIl., by Mr. Jas. E. McDade (92) ; and the 
treatment of the Odonata in Mr. H. Garman’s “Animals of the 
Waters of the Mississippi Bottoms near Quincy, I1.” (°90). Eight 
nymphs are listed in the latter paper. The original specimens 
have been examined and determined as follows: His “4” is 
Gomphus externus; “8. Epiwschna heros” is Nasiwschna penta- 
cantha of this paper; “9” is Tramea lacerata; 10", Epicordulia 
princeps ; and “11”, Perithemis domitia. “12” is immature and 
not positively determined as yet. The others are correctly 
identified by him. 
LIFE HISTORY. 
Dragon-flies hibernate commonly as nymphs, less com- 
monly in the egg stage, and in one species as imago. Nymphs 
of the Anisoptera mostly transform to the imago in the early 
part of the season, especially from the latter part of May to the 
first of July in our latitude, the imagos scattering and becom- 
ing reduced in numbers by midsummer. Some species, particu- 
larly those of the Gomphide, have a very short period of emer- 
gence, large numbers transforming within a few days. dAnar, 
and perhaps some species of #schna, has apparently two broods 
in a year. The adults appear very early in the season, and 
the young nymphs, feeding voraciously and actively, grow rap- 
