160 APPENDIX C. 



the back, are seen broad transverse light bands, produced by the ob- 

 literation of the black line in the 4th row, and by all the dorsal 

 scales between the light lines being yellowish white, with more or 

 less of purplish black towards the tips. There are about eight of 

 these dorsal marks on the anterior three-fifths of the body, the first 

 being indicated by a light bar on the nape. 

 Howard Springs, Tex. 206+1. — 15. 61|. 17|. J. H. Clark. 



12. MasticoplliS Scliottl, B. & G. — Greenish brown, with two nar- 

 row white lines on each side, becoming obsolete at about three-fifths of the 

 length from the head. Scales on the back yellow at the base. Sides of the 

 neck in front red. Dorsal scales in 15 rows. 



This species presents quite a close relationship to M. tamiatus, al- 

 though sufficiently different in its distribution of color. The general 

 tint above is a dark greenish olive. On each side are two well-de- 

 fined narrow yellowish white lines : the first along the junction of the 

 outer dorsal row and the abdominal scutellse, involving only the ad- 

 jacent angles; the second similarly constituted in relation to the 3d 

 and 4th rows (not running through the centres of the scales). The 

 portion of the 3d and 4th rows not involved by the upper white line 

 is black, as is also a narrow margin above the lower white line, of 

 the same diameter with it. The upper angles of the scales in the 

 first row, and the whole of those of the second row, are of a lighter 

 olive than the back. All the scales on the back between the upper 

 yellow lines of opposite sides are margined with yellow along their 

 basal edges, only evident on separating the scales. Anteriorly is a 

 short yellow line along the junction of the 2d and 3d rows of scales, 

 extending to about the 25th abdominal scutella. 



Color beneath dull yellow, with the greater part of the scutellas 

 closely and minutely blotched with greenish slate. Anteriorly the 

 proportion of yellow is much greater, and near the head the blotch- 

 ing is in two series, as in the rest of the genus. The tail also is 

 nearly unspotted yellowish, except anteriorly. On the external 

 fourth of the abdominal scutellse the blotching is more confluent, 

 forming a well-defined margin to the lower yellow line. Anteriorly 

 the side of the abdomen is of a dull red. The upper jaw is yellowish 

 white, excepting the lower edges along the 1st to the 6th labials, 

 which are black. Orbitals, loral, and nasals with a yellow central 

 ?pot. 



