Occasional Papers of the Altiscitin of Zoohxjy 9 



This form seems not to ditTer in size or proportions from L. 

 getulus boylii. The largest specimen examined was from the 

 Graham Mts., Arizona, and measured 1204 mm. 



Each branch of the copulatory organ is bilobed ; the sulcus 

 spermaticus is single, passes over one of the lobes, and ends in 

 a small smooth area at thi apical end of the organ. The 

 calyces are. few, their fringes fairly conspicuous or very short ; 

 the latter pass into spines, which increase gradually in size until 

 about one-third the way toward the base of the organ. Here 

 they stop suddenly, and, over about one-half the distance from 

 here to the base, numerous minute spines may be barelv dis- 

 tinguishable. The basal portion is smooth. No spines are dis- 

 tinctively enlarged or isolated from the others. 



The skull is like that of L. get ill us boylii. The dentition is as 

 follows: maxillaries commonly 13 to 14; mandibulars 14 to 17; 

 palatines 9 or 10; pterygoids 12 to 19; anterior mandibulars 

 larger than posterior; last two maxillaries somewhat stouter 

 than those preceding. 



The pattern, Hke that of L. (jcfiiliis boylii, is of white rings on 

 a black ground color, but, unlike the latter, the white scales of 

 these rings are marked basally with brown, which sometimes 

 extends irregularly over the scales so as to greatly ol)scure the 

 rings. The latter are narrow on the back, one to two and a 

 half scales in width, widening on the sides to about two to 

 five scales, and traversing the belly. As with other forms hav- 

 ing the metamoric pattern, the rings may be broken on the 

 middorsal or midventral line and alternated for a greater or 

 less distance, instead of united. 



The white bars across the i)refrontals and internasals, which 

 are characteristic of all the forms allied to L. gctulns boylii, oc- 

 cupy here not more than half the area of their resi)ective head 

 plates, fjeneath the eye there is usually a rather conspicuous 



