A.C. Bicknell 1958 Marepus californicus Mountaineer Mine, T.2S, R.24E, Riverside Co., Cal. Put up Aug-20 Put up 1 adult ♀ with no embryos or scars but with enlarged mammae + heavy mammary tissue + 2 young ♀'s - from a large lot collected by Chas. S. Thagess on July 18, 1958. (See species account of Myotis velifer for more info.). Young pelage "mouse" grey - about more brownish-grey with conspicuous white bases to hairs. 20th spec's put up by Thagess procured in wt. from Aug 7.1 to 13.5 gm. - ♀'s with litters weighed up to 11.8 gm + those with 3mm. Teeth up to 13.4gm so apparently young and adult represented in his collection. My adult ♀ had been pregnant so it may be doubtful that the milky-brownish fluid squeezed out of her large nipples was actually milk - if it was not, the animal must have been just about gestating. Thagess did not note any ♀ carrying the large young but as bats were scooped off ceiling with net he may have missed seeing them with nursing young. Mammae thoracic + well over to wing membrane + body wall junction. Both mammae sides well- equally developed, no noticeable amount of fat on any of my 3 specimens.