IIO The West American Sczentist. 
T. alexandri breeds, on this coast, from San Diego county, or 
farther south, to British Columbia; T. costce from Cape St. 
Lucas to San Bernardino county, perhaps as far north as Santa 
Barbara. 
T. annee breeds mostly in the agricultural districts of Califor- 
nia. I have found both sexes in Butte county in December, and 
occasionally in the foot hills of Central California in all months of 
winter. My most southern Lower California record for this 
species is Cerros Island. T. rufus is mostly a mountain and 
northern breeding species. It probably breeds in the coast 
range as far south as Santa Cruz and still farther south in the 
Sierra Nevadas. It is rather rare in the high Sierras in latitude 
38°, in breeding time, but is then abundant in some localities 
about a degree of latitude farther north. 
T. Alleni was named by Mr. Henshaw in honor of Mr. C. A. 
Allen of Nicasio, Marin county, in 1877. It much resembles T. 
rufus and was treated as such previous to 1887 and is with diffi- 
culty distinguished from it in the field. I collected both sexes ot 
T. alleni at San Diego in the spring of 1884 soon after I noticed 
the arrival of .T. rufus, the latter having been first seen on March 
10, and about the same time I saw fresh specimens in the posses- 
sion of Mr. Carl H. Danielson of San Diego. Mr. Skirm says it 
is a raresummer resident at Santa Cruz, and I do not know that 
it breeds south of that place. ; | 
According to Mr. F. Stephens a few individuals of T. calliope 
breed as far south as the pine region of the San Bernardino 
mountains. It is moderately common in the fir forest of Calaveras 
county in the breeding season and very common during this 
time in the high Sierras of Butte and Plumas counties. A few 
individuals migrate through the low parts of California, but it ap- 
pears to breed only in the mountainous parts of this State and 
northward. From the foregoing it will be seen that the nest 
found near Pasadena was probably the nest of T. alexandri, T. — 
costce or T. annoe, but without the parent positive identification 
is impossible. A nest and eggs without its owner may be a 
thing of beauty but usually it has no scientific value. | 
August 1, 1889. L. Belding. 
NOTES AND COMMENTS ON THE DISTRIBUTION 
OF PLANORBIS (HELISONMA) BICAKM Ae 
| LOS SA 4 : 
This well-known pond-snail first detected on the west coast of 
North America at Portland, Oregon, by Mr. Henry Hemphill, 
must also be credited to another west coast locality, namely to 
the region about the mouth of the Yaqui river near Guaymas, on 
the easterly side of the Gulf of California, about fourteen hundred 
miles south of the first named place where it was collected a few 
