1950 O. P. PEARSON 27 Feb. 11 Lubav Cave, _____ Blasta Cr, Calif. Left 7:30 a.m. for Lassen with Anita (last night). Arrived Lubav Caves 11 a.m. Clear day, 6" snow on ground. Physical conditions in the Caves was different than last year. In North branch only a few stalagnite icicles at entrance and considerable water dripping from ceiling in most places except in the long arm beyond its cave-in. The chamber where we slept last year was too wet for sleeping this year. Temp. in the bat chamber of north branch was 4.6 C. No bats present. In south branch of Lubav there were many long icicles from ceiling (none last year), some more than 6 ft long and one reaching ground from 14-foot ceiling. There were about a dozen single Cory on ceiling at drafty cross-tunnel where the ceiling temperature was 1.0 C. Body temp of one of these 9 bats was 1.2 C. In the bat-chamber the temp. was 3.5 and many Cory were present in 1 big cluster or as pairs or singles. The cluster contained 17 bats: 14 Cory, 14 S Cory, and 2 Mystria (probably M. californianus and M. subvelatus). This is the first time I have heard of any other species in contact with Cory. All or almost all in cluster had their straight; singletons had theirs curled up, or occasionally 1 up and 1 down. Read bands and bandels. Kept notes except of the 2 Mystria in the cluster (631, 632 AKP) and 3 other subvelatus hanging singly. 26 S returns, 3 female returns. Banded 3 new small spotted SS and 2 big spotted SS, also banded