10 



ARKIV FÖR ZOOLOGI. BAND 9. N:0 3. 



of infraoculars, the anterior small, ene of the posterior much 

 larger and wedged in between 4*^ and 5*^ supraoculars; temp- 

 les with large shields; 7 upper labials, the four anterior larg- 

 est, increasing in size to the 4*^ which is below the eye, the 

 posterior smallest; 5 distinct lower labials. Chin-shields, a 

 single anterior and five pairs, the four first pairs forming a 

 suture (in the type-specimen the third pair separated by a 

 small azygos plate), the fifth separated by small scales and 

 much smaller than the anterior. Collarrather 

 indistinct, formed only by three shields, the 

 median of which is much the sraallest, in 

 front of the collar two longitudinal rows of 

 enlarged gulars, ten in each row. 



Dorsal scales elongate, hexagonal, juxta- 

 posed, keeled ; lateral scales similar to the 

 dorsals but smaller and somewhat irregular ; 

 forty-three scales from occiput to base of 

 tail. Ventral plates in eight longitudinal 

 rows, outer row smaller, and twenty-two 

 träns verse rows. Thirty scales round the 

 body, including ventrals. Four praeanals 

 in two pairs, the posterior considerably 

 larger than the anterior. 



Limbs with large smooth imbricated 

 scales, hinder side of thigh and arm granu- 

 late; 7 — 8 femoral pores on each side; the 

 lepidosis of the tail resembles that of the 

 body. 

 Greenish brown above; a faint light dorsolateral line 

 from above the ear, and three indistinct dark dorsal lines. 

 A broad rather distinct black band from the eye, enclosing 

 the ear, fading behind the axil, below margined by white. 

 Upper lip, chin, and throat white, belly greenish white, 

 dotted with black. Tail brownish, lighter below. 



Measurements : Total length 32 + 78 mm; widthofhead4 

 mm; from end of snout to ear 7,8 mm; from end of snout 

 to före limb 12,5 mm; före limb 10 mm; hind limb 13 mm. 

 The specimen is a male, collected by Dr. N. Holmgren 

 at San Termin in the forest-region in the northwest of Boli- 

 via, August 1904. 



Pig. 3. Prionodac- 



tylus holmgreni 



n. sp. 



Lower view of head 



X 5. 



