506 MB. G. A. BOULENGER ON THE [May 18, 



extends down the middle line of the belly; there is a blue or 

 green spot, often edged or surrounded with black, on each side of 

 the throat, and a black bar in front of the shoulder, sometimes 

 extending across the neck ; breast whitish ; the two blue spots of 

 the throat sometimes confluent into one. In females, the lower 

 parts are whitish, uniform or with some small brown spots ; a pair 

 of blue spots is sometimes present on the throat. 



The Western form is often more olive above, sometimes greenish, 

 and the dark dorsal markings are frequently more in the form of 

 large blotches in two or four longitudinal series ; a light dorso- 

 lateral stripe is frequently well defined. The blue patches on the 

 sides of the belly are usually as well developed in females and 

 young as in males ; the latter, however, not unfrequently differ in 

 having the whole of the lower surfaces not occupied by the blue 

 colour of a uniform black. 



Although I am perfectly satisfied that the specimens here enu- 

 merated (see p. 505) cannot be divided into several species, yet it 

 would be desirable to attempt some sort of classification into varieties. 

 Tor such a purpose, however, my material is insufficient, and the 

 desultory and often misleading descriptions of supposed species 

 hitherto published in America are of no service. On examination 

 of a small material one would feel tempted to divide the species into 

 an Eastern (typical) and a Western form (var. biseriatiis, Hallow., 

 with which, according to Stejneger, my var. hocourti is identical), 

 the latter being distinguished by a rather larger size, larger ear- 

 lobules, and the presence of a large patch of blue on the sides of 

 the belly in females and young. But the size of the ear-lobules 

 varies, and some Western specimens have them no larger than in 

 the typical form. I have carefully compared specimens from 

 Monterey, which Stejneger refers to S. occidentaJis, with others 

 referred by the same authority to S. hiseriatus, and cannot find any 

 difference by which to separate them. 



Hah. This species has a wide range in North America, extending 

 from North Mexico to New Jersey on the east coast and British 

 Columbia on the west. Its range in Mexico cannot at present be 

 traced; but a specimen collected at Tzabal, Guatemala, by 

 Mr. Salvin, certainly belongs to it. 



17. SCELOPOBTJS ELONGATirS. 



Sceloporus elongatus, Stejneger, N. Am. Faun. no. 3, 1890, 

 p. 111. 



This species appears to be very closely allied to S. gratiosus. It 

 is described as follows : — 



" Head-shields smooth ; occipital [interparietal] comparatively 

 small, but broader than parietals ; two or three parietals on each 

 side ; two scales on canthus rostralis ; supraoculars, one large row 

 and three small subequal ones, two outer and one inner ; five free 

 scales in front of ear-opening; dorsal rows nearly parallel; lateral 

 scales but little smaller, in oblique rows ; scales on shoulders large, 



