42. CHILOMENISCUS 871 
eight, sometimes nine, seven or six, second smallest, fourth 
or fifth largest, first pair meeting on median line. Genials 
in two pairs, posterior much smaller. Scales on body smooth, 
in 13 rows. Anal plate divided. Gastrosteges varying in 
number from 108 to 125. Urosteges in two series of from 
Zl to 29. 
The color above is reddish orange, soon fading to white 
in alcohol, crossed by black or dark brown bars, bands or 
rings. These dark markings may or may not reach or cross 
the gastrosteges. They number from 18 to 28 on the body 
and from three to five on the tail. On the tail they usually 
are complete rings. The interspaces between the dark mark- 
ings do not differ much from the dark markings in measure- 
ment along the middorsal line. The posterior portion of 
the head above, including the parietal, frontal and the upper 
portions of the posterior supralabials are dark brown or black. 
The lower surfaces are white; where not involved by the 
dark bars or rings. 
Wren pthistovan iste sesame oe oe ee 104 202 225 
Weer c thie crtym tert) eee ee see es 16 33 26 
Distribution.—This little burrowing snake probably is 
confined to the Lower Sonoran Zone. It has been secured 
in California, Arizona, and Lower California. 
In California, it has been found only twice; in Owen’s 
Valley, Inyo County, and near Fort Yuma, Imperial Coun- 
ty. It probably occupies most of the intervening desert areas. 
In Arizona, it is fairly common in Pima County where 
it has been collected near Tucson, in the foothills of the 
Catalina Mountains, and in the Cabali Mountains. It has 
been secured also at Cave Creek, Maricopa County, and on 
the Yuma desert near Monument 200 of the Mexican 
Boundary, and six miles west of Gila Bend. 
In Sonora, it has been secured at Guaymas. 
