242 BULLETIN 15 4, UNITED STATES NATIONAL MUSEUM 



ol" head as percentage of body leiigtli, ii.()-LT.(J; hind leg, 30-^7; 

 length of hind leg as percentage of body length, 51.0-80.5; supra- 

 oculars, 3 in 86 specimens, 3^ in 2 specimens, and 4 in 3 specimens ; 

 supraocular granules extending forward to the middle of the third 

 supraocular in 35 specimens, to the anterior border of the third 

 supraocular in 46 specimens, to the middle of the second supraocular 

 in 8 specimens, and to the anterior border of the second supraocular 

 in 1 specimen. The forking of the single dorsal stripe varies from 

 2.3 to 32.6 per cent of its total length, including the fork. Although 

 a much greater percentage is often found in hyperythrus^ the fork- 

 iuo- in this latter species is in some cases almost as short as in 

 vaci'uleus of the lower extreme. Consequently, the extent of fork- 

 ing has practically no diagnostic value in caeruleus. 



Range. — {Carmen Island^ Gui\f of California., Mexico., Dickerson, 

 1019, p. 472, U.S.N.M., A.M.N.H., C.A.S., M.C.Z.) 



Habitat and luiblts. — Nothing is known concerning the habits of 

 this subspecies. Carmen Island is small (only 17 miles long and 

 less than 6 miles wide), volcanic in origin, and irregular in outline. 



Affinities. — This little lizard is very closely allied to the mainland 

 hyperythrus. Transition from the latter toward caendeiis may be 

 seen in certain mainland specimens which show a low percentage 

 of anterior forking in a single middorsal stripe. In these the un- 

 forked portion of this line is intensified and widened in such a way 

 as to very significantly approach the condition found in both 

 caeruleus and danheimae. Further approach to caeruleus may be 

 seen in certain mainland specimens which possess a more or less pro- 

 nounced reddish element in the general ground color. Thus 

 caeruleus seems to be a direct derivative of hyperythrus^ and, if so, 

 it is only indirectly related to danheirtiae. In view of this Ave may 

 consider that the widened and intensified dorsal stripe of caeruleus 

 w^as probably developed in the same manner and from the same 

 common ancestral stock {hyperythrus) as was that of danheimae. 



CNEMIDOPHORUS HYPERYTHRUS PICTUS (Van Denburgh and Slevin) 



MONSERRATE ISLAND RACE RUNNER 



1921. Vet-ticaria picta Van Denbukgh and Slevin, Proc. Calif. Acad. Sci., ser. 

 4, vol. 11, p. 98 (type locality, " Monserrate Island, Gulf of Califurnia, 

 Mexico"; type specimen,^"' C.A.S. No. 49155, J. R. Slevin, collector).— Van 

 Denbukgh, Occas. Pap. Calif. Acad. Sci., vol. 10, 1922, p. 575.— Schmidt, 



30 Since the type was not described in detail in tlie original diagnosis of this species, it 

 seems best to take this opportunity to present some additional facts concerning it. A 

 short description follows : Head scutellation normal for the subspecies ; frontal entire ; 

 parietals 3 ; occipitals small and irregular ; supraoculars 3 ; supraocular granules extend- 

 ing as far forward as the center of the third supraocular ; postmesoptychial granules 

 present on edge of posterior gular fold; femoral pores 18-21. Measurements: Body, 

 U2 mm. ; tail, 178 ; total length, 240 ; width of head, 8.25 ; hind leg, 44 ; anterior border 

 of tympanum to tip of snout, IG; longest toe, 22. The type is excellently pre.served. 



