1322 
REPORT OF THE CHIEF OF ENGINEERS. 
GRACULID2E. 
65. Graculus dilophus (Sw.)—Double-crested Cormorant. 
A few of this species are said to pass the summer on the lake, where, however, they 
do not breed. They appear to leave the lake early in October, aud I saw none at the 
time of my visit. Mr. Ridgway has identified the form from this region as the above 
LARID2E. 
66. Larus delawarensis Ord.—Ring-billed Gull. 
I shot a single immature gull on Lake Tahoe, November 1, which I refer with but 
little doubt to this species. I am unable to state the numerical proportion which this 
bird bears to the next in this region during the late fall. According to Mr. Ridgway 
it should replace entirely in winter the next species. 
67. Larus californicus Lawr.—Californian Gull. 
Of five gulls shot on Tahoe, about November 1, four appear to belong to this spe¬ 
cies. They unquestionably winter here. 
COLYMBIDzE. 
63. Colymbus torquatus Brunn.—Great Northern Diver. 
I saw a number of specimens in possession of Mr. McKinney, which he had shot on 
the lake in fall. They do not appear to be very numerous. 
69. Podiceps auritus (L.), var. californicus (TIeerm.)—American Eared Grebe. 
Very numerous all along the borders of Tahoe in fall. So utterly fearless and unso¬ 
phisticated are they that they swim about the wharves, utterly regardless of the pres¬ 
ence of humans but a dozen or twenty feet away. 
Appendix J. 
REPORT UPON THE HEMIPTERA COLLECTED DURING THE YEARS 1874 AND 1875, BY 
MR. P. R. UHLER. 
Peabody Institute, Baltimore, Md., 
March 24, 1 877. 
Sir : I have the honor to transmit the following report upon the Hemiptera collected 
by the expedition during the years 1874 aud 1875. 
Very respectfully, your obedient servant, 
P. R. UlILER. 
Lieut. Geo. M. Wheeler, 
Corps of Engineers , in charge. 
_ 
HETEROPTERA. 
Subfamily EUEYGASTKINiE. 
j Eurygaster, Lap. 
E. alternatus. 
Tetyra alternata , Say ; Araer. Ent. iii. tab. 43, fig. 3. 
Eurygaster alternatus , Dallas; Brit. Mus. List. Ilemipt. i, p. 47, No. 1. 
San Ildefonso, N. Mex., September, 1874, collected by Dr. H. C. Yarrow; also, near 
Colorado River, California, July 20, by William Somers. 
