76 REPTILES. 



29. DiMADES. 



Head distinct ; crown shielded ; frontal shields 3 ; anterior 

 small, transverse ; hinder small ; loreal none ; vertical, superciliaries 

 and occipital plates large; mental small: nostrils very close to- 

 gether : eyes rather large, anterior, over the suture of the third and 

 fourth labial : one anterior and two posterior oculars : upper labial 

 plates entire ; the seventh short, with a large temporal plate above 

 it : body thick ; scales broad, smooth, in fifteen rows : tail conical. 



Dimades, Gray^ Zool. Misc. 65, 1842. Helicops sp., Wagler, 

 Syst. Amph. 171. Pseuderyx sp., Fitz. N. Class. 55. Pseuderyx, 

 Fitz. S. R. 1843. Homalopsis sp., Schlegel, Phys. Serp. 353. 

 Anat., Schtegel, Phys. Serp. 355. 



1. The Dimades. Dimades plicatilis. Gray, Zool. Misc. 65. 

 Col. plicatilis, Linn. Mus. Adolph. i. 23, t. 6, /.I. Seha, Thes. 

 i. t. 57, /. 5, ii. t. 53. /. 3. Merrem, Beytr. ii. 28, t. 5. Scheuch. 

 Ph. Sacra, t. 653, /. 2, t. 662, /. 10? Homalopsis plicatilis, Boie^ 

 Isis, XX. 551. Schleyel, Phys. Serp. 353, t. 13, /. 21, 23. Helicops 

 plicatilis, tVagler, Syst. Amph. 171. Bali, Lacep. Quad. Ovip. ii. 

 176, t. 9,/. 1 Cerastes plicatilis, Laur. 81. Elaps plicatilis, 

 Schneid. H. Amph. 294. C. Natrix plicatilis, Merrem, Tent. 99. 

 Pseuderyx Daudinii, Fitz. N. Class. Rept. 55. Pseuderyx plicati- 

 lis, Fitz. S. R. 25. 



Body subcylindrical ; scales square, with rounded angle, broad, 

 smooth ; back red brown, beneath yellowish ; sides with a broad 

 streak spotted on the edges ; crown brown-spotted, with a dark- 

 edged yellow temporal streak. 



N. America, New Orleans. Mus. Strasburg. 



Coluber serratus, Herrmann. Homalopsis plicatilis, var., 

 Schlegel, Phys. Serp. 355. Dimades plicatilis, var., Gray, Zool. 

 Misc. 65. 



Reddish yellow : back, a streak on each side, and two rows of 

 large spots beneath, black or bluish. 



*** Frontals 3 ; anterior elongate, erect, hetween nasals. Head mo- 

 derate, depressed ; rostral rounded. Scales smooth. 



30. FORDONIA. 



Head dilated behind, crown shielded ; frontal plates 3 ; anterior 

 elongate, between the nasal ; vertebral and occipital small ; super- 

 ciliary very small ; loreal none ; upper labial plates very large, few ; 



