Length to anus 64 66 70 70[3] Length of tail 76 68 78 79 Snout to ear 14 13 14 16 Width of head 14 12 14 15 Shielded part of head 14 13 14 15 Fore limb 27 26 27 30 Hind limb 41 39 41 46 Base of fifth to end of fourth toe 16 15 16 18 [Footnote 3: Type.] This species is in general appearance similar to _S. occidentalis_, but differs in the contact of the frontoparietal and supraocular shields, the coloration of the throat, and the somewhat more feeble carination and mucronation of its dorsal and caudal scales. Specimens from Santa Rosa and Santa Cruz islands, as stated below, seem to show that this form has been developed from _S. biseriatus_ stock. Five specimens (Nos. 4534-4538) in the collection of the California Academy of Sciences were secured by Mr. R. H. Beck on San Miguel Island, March 26, 1903. =3. Gerrhonotus scincicauda= _Skilton_. One specimen (Cal. Acad. Sci. No. 4539) was taken by Mr. Beck on San Miguel Island, March 26, 1903. It has dorsals in 14½ × 49 rows, temporals smooth, scales on arm and forearm smooth, and dark ventral lines along the middles of the scale rows. It seems to differ from the Santa Rosa Island specimens only in the slightly more feeble carination of the scales generally, the small size of the azygous prefrontal and of the scales on the under surface of the forearm, and a tendency toward the formation of fourteen rows of ventral scales shown by the presence of a few small scales along the edge of each lateral fold in addition to the usual twelve longitudinal rows. There are sixty-six ventrals in a row between the chin and the anus. SANTA ROSA ISLAND. I have examined one species of _Batrachoseps_ and two kinds of lizards from this island. The _Gerrhonotus_ has already been reported from the island, the others are new to its known fauna. =1. Batrachoseps pacificus= _Cope_. Dr. Gustav Eisen secured eight specimens of _Batrachoseps_ on Santa Rosa Island in June, 1897. These are now in the collection of the Academy (Nos. 3877-3880 and 3891-3894) and seem to differ in no respect from the form found on San Miguel Island. All have seventeen costal grooves. The measurements of these specimens are