SYNOPSES AND DESCRIPTIONS. of 
fifth of total, tapering. Eye moderate, pupil round. Head-shields nine. 
Frontal narrow anteriorly. Rostral large. Internasals one third smaller 
than prefrontals. Nasal divided Loreal elongated, angular, horizontal. 
Orbitals 1—3. Posterior 2—3. Temporals 1+2. Labials seven, nearly 
equal, first and last smallest. Infralabials eight (7—8), fourth largest. 
Seales smooth, broad, in 15 rows, outer broader. Ventrals 149, Anal 
bifid. Subcaudals 39 pairs. 
Body crossed with transverse jet black bars, 25 from head to anus, 
extending between and involving the exterior rows, becoming narrower 
on the flanks; along the back three to four scales long. Space between 
the bars above orange red, one scale wider than the black bars; on the 
sides greenish, with the base of the scales blackish. On the tail six black 
rings, continuing ail around, covering two to eight scales; intermediate 
space red orange, four to five scales wide. Beneath uniform dull green, 
the black bars of the body not touching the scutellae. (From descr. ) 
Sonora. 
CoNnTIA OCCIPITALIS. 
Rurostoma occrrrrae Hallowell, 1854, Pr. Ac. N. Se., Phil., 95. 
“Teeth of equal length, posterior ones not channeled; head depressed, 
eyes small; a rostral, two anterior and two posterior frontals; one anterior 
and two posterior oculars; a ventical; two occipitals; a small frenal: 
nostrils in a single plate; seven superior labials, the eye resting on the 
third and fourth. Abdominals 158; subeaudals 34. 
“Milk white above, with 41 transverse black bands, including seven 
upon tail and one upon posterior part of head; six complete rings upon 
tail; throat and abdomen white, with transverse bands continuous with 
those upon back of tail; 15 rows of smooth quadrangular scales.” Mohave 
Desert. 
It is possible that this species and @. ésozona will yet be united with 
C. semiannulata, 
var. ANNULATA. 
Completely encircled by black rings. Colorado Desert. 
