Cope.] ^ * ^ [Dec 19, 



Sliglit variations sometimes occur in the C. mutabilis. One specimen 

 has 35 rows of scales ; another has but two rows of temporals on one 

 side ; another has nine superior labials on one side. 



The head is long and rather narrow. The prefrontals are, each, longer 

 than wide ; the frontal is not narrowed ; the parietals are truncate behind. 

 The suture between the loreal and the prefron tal is oblique, running pos- 

 teriorly downwards, so that its superior border is only half as long as the 

 inferior. The preocular does not reach the frontal. There are, as in the 

 other Mexican species of the genus, but two postoculars. The eye is over 

 the fourth and fifth labial. None of the labials behind the fifth is ele- 

 vated, but the sixth is elongate so as to border the ends of the three long 

 temporal scuta. The inferior of these covers the seventh and part of the 

 eighth labials, and supports above it two others like it, all being directed 

 downwards and forwards. The superior encloses little scale with the 

 superior postocular. Inferior labials, eleven ; geneials well developed, 

 the posterior smaller and separated by scales. 



In a young specimen 450 mm. in length, where the color markings have 

 not become obsolete, there are 76 dorsal spots, of which 51 are between 

 the nape and the vent. These spots are transversely quadrate, covering 

 11 scales transversely, and two and a half scales anteroposteriorly. They 

 are dark brown with light edges, and paler centers. The interspaces are 

 less than two scales long. The lateral spots are opposite the intervals 

 and are in one row ; they are subround or suboval. There are two brown 

 stripes on the nape which, instead of uniting at both ends, as is the case 

 in the G. flavirufus, are separate posteriorly and diverge anteriorly, ex- 

 tending to above the posterior part of the orbits. Between them another 

 band occupies the middle line, but is more or less broken. A broad brown 

 band convex forwards between the fronts of the orbits. A brown spot 

 behind orbit. Below immaculate. • 



Gastrosteges, 282 ; anal double ; urosteges, 109. Total length, M. 1.090 ; 

 of tail, .235 mm. 



The typical specimen is from Vera Paz ; No. 6735 Mus. Smithsonian. 



Manolepis nasutus. Tomodon nasutus Cope, Proceedings Academy 

 Philadelphia, 1864, p. 166. 



This species cannot enter Tomodon D. &B., because it has a divided 

 anal plate, and no scale-fossge, though it agrees with that genus in its 

 single nasal plate and smooth scales. I therefore propose the genus Mano- 

 lepis to embrace it and similar species. 



Hydrocalamus QtriNQUEViTTATUs. Homalopsis quinquevittatus Dum. 

 Bibr. Erp. Gen. vii, p. 975. Cnlopisma quinquevittatus Jan. Elencos 

 Sistematico, p. 75. Hydrops lubricus Cope. Proceeds. Acad. Phila., 

 1871, p. 217. 

 Vera Paz, Dum. Bibr. ; E. Tehuantepec, Streets. 



Dum6ril and Bibron put this species quite out of its place, so that I 

 did not perceive it in my Hydrops lubricus. It requires a new generic desig- 



