COLUBRINAE 



615 



Islands, grows to 1 feet in length ; it is consequently one of 

 the largest harmless Colubrine snakes. The scales form only 

 sixteen to eighteen rows. The sub-candals are double. The 

 general colour above is dark olive, passing into greenish brown 



Fig. 162. — Zaocys carinatvs. x 



farther back. The under parts are yellowish ; black and yellow 

 posteriorly. The fifth and sixth labials Ijorder the eye. 



Coluber. — The maxillary teeth are of equal size, but the 

 anterior mandibular teeth are the longest. The head is distinct 

 from the neck. The nasals are distinct ; not fused with the 

 loreals. The eye is rather large, with a round pupil. The 

 scales, smooth or keeled, have apical pits ; the ventrals are 

 rounded or angulate laterally ; the sub-caudals are double. They 

 all lay eggs and constrict their food. Nearly fifty species in the 

 Periarctic region. 



C. {Elcqihis) quatuorlineatus s. quatei'Tadiatus inhabits Italy 

 and South-Eastern Europe. It occurs also in the Southern 

 Tyrol. The scales of this large snake, which grows to nearly 

 6 feet in length, are arranged in twenty-five rows, and are feebly 



