4 ARKIV FÖR ZOOLOGI. BAND 9. N:0 3, 



small irregiilar scales. At the shoulder and towards the groin 

 the sides are provided with small oval scales, but on the 

 middle of the body the lateral scales are as large as the 

 dorsals; only a narrow band 'of one to three rows of scales 

 separate them from the ventrals. Ventrals large, quadran- 

 gular, smooth, forming twelve longitudinal and twenty-two 

 or twenty-three transverse series; forty-two to förty- five 

 scales in all round the middle of the body. Prseanals seven, 

 an anterior pair and five posterior shields, the two outermost 



Fig. 1. Proctoporua columbianus n. sp. o. Upper 



view of head ; b. lateral view of the middle of body ; 



c. lower view of anal region in the male ; d. anal 



plates in the female. 



and the median one of which are narrow, the last being ra- 

 ther variable; in the males it is long and narrow, in the 

 females only a small triangulär shield at the posterior edge 

 of the prseanal field (Figs. c and d); the scales of the limbs as 

 well are smooth. Femoral pores nine or ten; none of these 

 may be termed prseanal. Caudal scales similar to those of 

 the body but without any row of small scales between the 

 laterals and the ventrals. 



Colour above and on the sides dark umber brown, lighter 

 on the head; in the male there is a row of blackish lateral 



