KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 55- N:0 4. 11 



especially on the sides are somewhat larger than the body scales. Four upper labials, 

 the foremost of which is much the largest, the second is the narrovvest and situated 

 below the orbit. The region round the orbit is covered with small irregular scales, 

 but in the temporal region the shields are somewhat larger. A very large mental 

 covers the end of the lower jaw and the chin. Behind the same four lower labials 



Fig. 4. Tail end of Isopachys gyldenstolpei. 



A. Österberg del. 



the foremost of which, however, on one side is coalesced with the mental. The 

 posterior margin of the mental is bordered by two enlarged scales. 28 smooth scales 

 round the middle of the body, 32 at the anterior third. Two larger anal scales in 

 the middle, smaller on the sides, and very small behind the vent (conf. fig. 4). The 

 scales on the tail are a little larger than those of the body so that there are only 



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Fig. 5. Isopachys gyldenstolpei. 



A. österberg del. 



20 scales around the tail near the end of that organ, although it has practically the 

 same diameter as the body. At the extreme end of the tail there is an enlarged 

 somewhat irregular shield. 



The colour is dark lead grey with a broad white band on either side (covering 

 3 — 4 scales). and a narrow, less sharply defined white median stripe. The latter dis- 

 appears on the base of the tail, and the dark dorsal colour displays there a serrated 

 edge towards the white lateral band. 



