R. Zweifel 1953 Crotalus pricei 6 mi. WSW Las Adjuntas, 8500', Durango, Mexico 2405 R2 July 9 At about 9:30 this morning this snake was seen to crawl under a rock on a sunny, exposed (due to logging) slope. The snake escaped into the rock rubble, but when I returned about three hours later it was again out sunning and was captured this time. 2414 R2 July 10 Jerry chased one under a rock on a rock-rubble littered hillside. When I returned to capture it, it was sharing its abode with a skink (E. brevisrostris). The attraction of the brilliant blue tail was such as to make the rattler even more intransigence, and could easily have had unpleasant consequences had I not been specifically expecting the snake at that spot. The snake proved to be a gravid female, with the embryos quite far along.