We acknowledge, of course, the creativity and enthusiasm of W. Downs, who made all of this work possible. We all shared many memorable field adventures with Will, and we all miss him. We also wish to thank the many citizens of the Dalana area who facilitated our research, and our colleagues at the GSP who freely shared information with us. We wish to thank the Pakistan Museum of Natural History for support, and National Geographic Society Grant 6402-99, as well as PL 480 funds administered through the Smithsonian Institution that enabled our fieldwork.