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., Schlegel, Phys. Serp. 355. 
1. The Dimaves. Dimades plicatilis, Gray, Zool. Mise. 65. 
Col. plicatilis, Linn. Mus. Adolph. i. 23, t. 6, f.1. Seba, Thes. 
i. t. 57, f. 5, ii. t. 53. 7.3. Merrem, Beytr. ii. 28, t.5. Scheuch. 
Ph. Sacra. t. 653, f. 2, t. 662, f. 10? Homalopsis plicatilis, Bote, 
Isis, xx. 551. Schlegel, Phys. Serp. 353, t. 13, f. 21, 23. Helicops 
plicatilis, Wagler, Syst. Amph.171. Bali, Lacep. Quad. Ovip. ii. 
176, t. 9, f. 1. Cerastes plicatilis, Zaur. 81. Elaps plicatilis, 
Schneid. H. Amph. 294. C. Natrix plicatilis, Werrem, Tent. 99. 
Pseuderyx Daudinii, Fitz. N. Class. Rept. 55. Pseuderyx plicati- 
lis, Fitz. S. BR. 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, between 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 ; 
