4 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 
Mr. E. A. Schwaiz, assistant entomologists in the National Department 
of Agriculture, and Mr. 1>. W, CoquUlett, of California, one of Professor 
Riley's field agents, for numerous favors in identifying insects, and other 
aid, and information. 
For some of the colored drawings the author is indebted to Mr. Joseph 
Bridgham, Mr. II. H. Wilder, Prof. II. C. Bumpus, Miss Julia E. Sand- 
ers, Miss Emily A. Morton, and to the late Dr. J. L. Le Coute for a 
few colored drawings bequeathed by his father. These are specifically 
acknowledged in the explanations of the plates. Professor Riley has 
also had a number of original drawings made by Dr. George Marx, Mr. 
J. B. Smith, Miss Lillie Sullivan, all of AYashingtou, and others have 
been made by Mr. Joseph Bridgham, of Providence, R. 1. The artists 1 
names are mentioned under the cuts in the text. 
For aid in collecting specimens in Maine he is indebted to Mr. H. H. 
Wilder and Master Allen Howe, of Lcwistou. 
The author is well aware of the short-comings and imperfections in 
this report. A good deal of time has been expended in unsuccessful at- 
tempts at raising insects, which has not produced visible results. Up- 
wards of two hundred descriptions of unidentified larvae have been 
made; those of the oak appear in the appendix, and others are scat- 
tered through the report. It is hoped that future observations will en- 
able us to complete these life-histories. It would have been desirable 
to have had more and, in some cases, better illustrations. 
This report will be sent to all known to be specially interested in en- 
tomology, and they are respectfully asked to send the author corrections 
and additions, as undoubtedly a number of species have been omitted 
from the list of those peculiar to different trees. Such changes could 
be made in a second, revised edition, should it be called for by the 
public. 
Brown University, 
Providence, R. J., January 2, 1888. 
