in the Collection of the British Museum. 419 



appears as a straight band on the tail. Upper part of the 

 head uniform brown, separated from the white colour of the 

 lower part by an indistinct black line, which runs from the 

 orbit to the angle of the mouth, and is indistinctly edged with 

 white below. Ventral and subcaudal shields uniform white, 

 having only a blackish spot on the side, as mentioned be- 

 fore. 



Two specimens were sent by Mr. John Hauxwell from 

 Pebas ; they are 12 inches long, the length of the head 

 being 4 lines, and that of the tail 3g inches. Another ex- 

 ample, collected by Mr. Fraser in Western Ecuador, appears 



Dromicus laut'eatus. PL XIX. figs. E. 



Scales smooth, in seventeen rows, many with a small apical 

 groove. Form of the head as in Coronella Icevis ; body and 

 tail moderately slender. Eye of moderate size ; the rostral 

 does not extend to the upper surface of the head; anterior 

 frontals scarcely half as large as posterior ; vertical longer 

 than the snout, but shorter than the occipitals, which are 

 rounded behind ; loreal square ,• one prteorbital, reaching to 

 the upper surface of the head, but not extending on to the 

 vertical ; two postoculars ; seven upper labials, the third and 

 fourth entering into the orbit; temporals 1 + 2 + 3, the ante- 

 rior in contact with both postoculars ; two pairs of chin- 

 shields, nearly equal in length ; ventrals 163 ; anal bifid ; 

 subcaudals 95. 



A lead-coloured band, three scales broad, runs from the 

 nape, along the median line of the back, to the end of the tail ; 

 flanks reddish, with a very indistinct greyish streak along the 

 fourth outer series of scales ; two yellow lines across the ros- 

 tral, the lower runs along the upper labials and across the 

 neck, thus entirely encircling the head ; the upper rmis along 

 the canthus rostralis, and stops or terminates in the temporal 

 region. Lower parts uniform yellowish. 



One specimen was in a collection made by Hr. Doorman 

 in the neighbourhood of the city of Mexico. It is 21 inches 

 long ; head 6 lines, tail 7 inches. 



The dentition of this species is neither distinctly diacran- 

 terian nor syncranterian. The maxillary is armed with nine 

 teeth, gradually becoming stronger, longer, and more widely 

 set behind ; the last is conspicuously the longest, but scarcely 

 more distant from the penultimate than this is from the ante- 

 penultimate, although these three teeth are much more distant 

 tlian the others are from each other. 



