UNIVERSITY OF CALIFORNIA, RIVERSIDE BERKELEY • DAVIS • IRVINE • LOS ANGELES • RIVERSIDE • SAN DIEGO • SAN FRANCISCO SANTA BARBARA • SANTA CRUZ DEPARTMENT OF BIOLOGY RIVERSIDE, CALIFORNIA 92521 November 8, 1982 Dr. F. Harvey Pough Department of Biology Virginia Polytechnic Institute and State University Blacksburg, Virginia 24061-0794 Dear Harvey: This is in response to your recent letter regarding data for Gerrhonotus multicarinatus and Phrynosoma m'calli. I do not have any for Gerrhonotus. The only people I can think of that might have some information on that species would be Glenn Stewart at California State Poly- techic University at Pomona, Bayard Brattstrom at Cali- fornia State University at Fullerton, or the herpetologists at the Los Angeles County Museum. However, I do have considerable data on P. m'calli. I have been so busy trying to acquire land to add to the U.C. Natural Land and Water Reserves System that these data still are only in my files. So much time has passed since they were collected (1959-1964), I'm somewhat embarrassed to publish them at this late date. Nevertheless, the infor- mation you requested was easily obtained from the files. I hope that these numbers will be helpful for your project. The hatchling data are for young of the year that were captured in the field in late summer and early fall (July, August, and September.) They are not the measurements from young animals at the time they left the egg. However, these measurements (at least the minimum measurements) should approximate those at the time of hatching. The enlarged post-anal scales in males made it quite easy to sex even young animals. It was a bit difficult to determine the maximum snout-vent length for juveniles. I settled on 50 mm. because only a very few were found at that size by the end of summer, but there were some animals at each of the sizes below that figure. The minimum S-V size of reproduc- tively active animals (motile sperm in vas deferens, eggs in oviducts) for both sexes was 63 mm. Therefore, all animals that measured 63 mm. or more were included in the adult sample. These adult S-V measurements were obtained at the time the animals were autopsied for the reproductive cycle study I conducted. The weights were obtained from newly captured animals that were used for live experiments.