260 INSECTS INJURIOUS TO FOREST AND SHADE TREES. 
AFFECTING THE BIRCH: 
Apatela spinigera Guen, R. Thaxter, Psyche, ii, 121. 
AFFECTING THE MAPLE: 
ELunomis alniaria; larva abundant on maple. C. E. Worthington in Can. Ent, x, 1€ 
AFFECTING THE LOCUST: 
Kedytolopha insiticiana Zeller, Comstock’s 1880 Rep. Dept. Ag. 260. 
Pempelia contatella Grote, Comstock’s Rep. Dept. Ag. 261. \ 
AFFECTING THE HoNrY Locust: 
Pempelia gleditschiella Fernald, Comstock’s 1880 Rep. Dept. Ag. 262. 
AFFECTING THE SCOTCH PINE: 
Chermes pinicorticis H. Osborn, Iowa Ag. Report, 96, 1881. 
AFFECTING THE PItcH PINE: 
Tomicus exesus, Harris’ Treatise, 87. 
Tortrix politana, Haworth ?, Comstock’s 1880 Rep. Dept. Ag. 264. This is the cater- 
pillar whose case is figured and described on7page 207. _ 
AFFECTING PINUS TEDA: 
Tetralopha diluculella Grote, Comstock’s 1880 Rep. Dept. Ag. 263. 
AFFECTING ABIES BRACTEATA: 
Grapholitha bracteatana Fernald, Comstock’s 1880 Rep. Dept. Ag. 265. 
AFFECTING THE LARCH: 
Tomicus pini, Harris’ Treatise, 88. 
Samia columbia (Caulfield). 
CORRESPONDENCE. 
{The following correspondence relates to certain insects mentioned in the foregoing pages. } 
PHILADELPHIA, October 13, 1881. 
My Dear Doctor: Iam afraid that some confusion has been produced by the 
crowded condition of my box of Pityophthori. The specimens have now been prop- 
erly spaced and arranged, and I have gone over them carefully. 
The result is that Blanchard’s oak bark species is P. minutissimus Zimm., and I con- 
sider it as Dr. Harris’ Tom. pusillus. It agrees very nearly in habits and characters 
with P. pubipennis Lec., from California. The ¢ has the front heavily fringed with 
long yellow hairs. 
The species found by Blanchard (to me No. 36) under white pine bark is P. sparsus, 
and is easily known by the prothorax having a smooth spot each side behind the 
middle, and by the very shining lustre. The elytra are feebly and sparsely punctured, 
the declivity is deeply suleate near the sature, and on the outer limit of the groove 
are two or three acute cusps. This species is depredated on by Hypophleus tenuis. 
Then there is P. puberulus, well described by me from the specimen given me by 
Ulke. Specimens since received from Schwarz (Port Huron) and Blancbard (Mass. , 
No. 139) have the elytra more strongly punctured. 
I am disposed to believe this species from white pine is the one referred to by Dr. 
Fitch as Yom. pusillus Harris. It is about the size of ramulorum of Europe, but the 
elytra are more coarsely punctured, and the punctures are not arranged distinctly in 
strive, but are confused. This is probably your 35. 
Your No. 34, as I see by reference to Fitch’s report,jis quoted textually from that 
author, and if my opinion be well founded, is not different from your 35, unless it be 
annectens. If there are any types to be seen, please have them sought for, and send 
me one. I have forgotten what became of Fitch’s collection. 
Tain sorry your correspondents have not been more diligent in collecting these 
destructive insects, so that their characters may be defined, and their habits after- 
