Hauken, James 1976 Atelopus sp. MVT, Berkeley, Calif, USA 94720 22 April 12 Noon - The 2 Atelopus from which I collected last summer in western Panama and have been kept alive in Dave Wake's lab were found in amplexus this morning. Below I have recounted observations made on them so far. ~8:10AM - I entered Dave Wake's lab and noticed the 2 Atelopus in amplexus in a corner of their plastic tray. They were positioned on a flat moist paper towel - there was a crumpled paper towel at the other end of the tray. The ♂ was immobile while on top of the female, not noticeably constricting her with his limbs. The ♂ was more towards the ant. end of the ♀ with his forelimbs behind those of the ♀. Because of the much smaller size of the ♂ his rump reached only to a point ~2/3 of the way back along the ♀'s dorsum. Both animals were long, axes were in the same direction but the ♂ was positioned a bit off center of the ♀ to his left. The ♀ was not attempting to shake off the ♂, but she was moving her hind limbs in a peculiar fashion; alternately lifting each hind limb off the ground in a semi-extended position for a second or two while the distal tips of the limbs vibrated at a slow rate. Occasionally both hind limbs were lifted simultaneously, these leg lifts were consecutive,