34. LAMPROPELTIS 769 
174. Lampropeltis catalinensis Van Denburgh & Slevin 
Santa CaTaLina Istanp MILk SNAKE 
Lampropeltis catalinensis Van Densurcu & Stevin, Proc. Cal. Acad. 
Sci., Ser. 4, Vol. XI, 1921, p. 397 (type locality, Santa Catalina 
Island, Gulf of California, Mexico). 
Description.—Similar in size and form to L. california. 
Top of head slightly flattened posteriorly, curving down- 
ward to the broad rounded snout. Temporal regions rarely 
if ever swollen. Rostral plate large, little broader than 
high, hollowed below, and bounded behind by internasal, 
anterior nasal, and first labial plates. Plates on top of head 
are a pair of internasals, a pair of prefrontals, a short, broad, 
irregularly wedge-shaped frontal, supraocular of each side, 
and a pair of large parietals. Anterior and posterior nasals 
distinct. A small loreal. One preocular and two postoculars. 
Temporals normally two followed by three. Eight superior 
and nine inferior labials, seventh superior and fifth inferior 
largest, fourth and fifth superior reaching eye, first pair of 
inferior meeting on median line. Genials in two pairs, anter- 
ior much larger than posterior. Scales smooth, thin, imbri- 
cate, in 23 rows. Anal plate not divided. Gastrosteges 228. 
Urosteges 63; in two series. 
The ground color above is dark purplish brown, similar 
to that of some specimens of L. californie. There are no 
transverse markings. The ground color forms a dark longi- 
tudinal dorsal band about five scales wide extending from the 
head to the end of the tail. Along the middorsal line, at 
nearly regular intervals of three or four scales, are small 
yellowish white spots on single scales. All of the lateral 
scales are yellowish white with narrow purplish brown 
borders. The head is dark purplish brown above and later- 
ally with small yellowish white markings on the internasals, 
prefrontals, temporals, oculars, loreals, nasals, rostral, and 
