P. PEARSON 1949 76 1565 ♀ Corynorhinus rafinesquai captured April 28, kept in cold [box] room - killed May 9, Rt. horn large, flabby, no signs of fetus. 1566 ♀ Corynorhinus rafinesquai captured April 28, kept over [box room], aborted May 10. Fetus with head 8½ mm. long, CR about 13 mm. long. killed May 10, Vented further. Muzzle small. Uterus muscular but collapsed, its Rt horn 7 long x 4 ant-post x 5 dorso-vent; empty. 1567 ♀ Corynorhinus rafinesquai captured April 28, kept warm [dark-room], aborted May 11, Fetus with head about 8½ mm. long, CR about 15. killed May 11, Rt. horn collapsed, smaller part quite long. Empty. tunnel m. lucerne, Lake Co., Calif. 1568 ♂ Corynorhinus rafinesquai 8.1g. captured after 12 in afternoon in tunnel at Lucerne by MK, CK, and SB. killed 8:30 a.m. May 14. Teeth 5½ mm., opened. dark not more than 3mm. Teeth white not flabby, tubules not visible to naked eye. Accessory very small, less than 2 mm. long. No sperm seen in epididymis. In sections: many spotty diverticula, some very few interlobes - no sperm. Proximal interstitial cells large, fairly abundant. 1569 ♂ Myotis lucifugus Teeth 3 mm., plump. Accessory very small. caught by MK Lucerne tunnel at night May 12, killed May 14. Aetna Springs, 800 ft., Napa Co., Calif. 1570 ♀ Corynorhinus rafinesquai captured Aetna Springs April 28, kept in warm room [box-room], aborted May 15. fetus entire except restitution which appeared somewhat less than that of 1571 while head head length of 10mm. Muzzle large. Some bloody discharge when killed May 16. Rt horn 6 mm. long, 5 mm. ant-post, 3 mm. dorso-vent. 1571 ♀ Corynorhinus rafinesquai captured Aetna Springs April 28. kept in cold room [box-room], aborted May 15. killed May 16. Fetus with head 10mm. long. Others aborted May 5 with skull 8 mm and May 10 with skull 7½ mm. Muzzle large - Rt. Uterus large + collapsed.