Cope.] 1*0 [Dec. 19, 



Leptocalamus xjnicolor. GeopMs imicolor Fischer. Abhandl. d. Na- 

 turwiss. Vereins, Bremen, 1881, p. 227. 

 This species is allied to those of the genus Catostoma, hut Fischer re- 

 marks that it has an elongate posterior maxillary tooth, or a syncrante- 

 rian dentition. This requires its separation from Catostoma, and its loca- 

 tion in another genus, as indeed is remarked by Fischer, I. c. This has 

 been already established by Giinther for another species. 



Rhe'gnops zebrinus Jan. Rhabdosoma zebrinus Jan Bocourt, Miss. 

 Scient. Mexique, PI. xxxiv, fig. 1. 

 This and another species are separated by Bocourt from the genus Catos- 

 toma ( Oeophis) on account of the divided anal scutum. He applies to 

 this genus the name Rhabdosoma Dum. Bibr. Unfortunately there is 

 not a species of that genus, as enumerated by Dumeril and Bibron, which 

 possesses this kind of an anal scutum, and they must all be referred to 

 Catostoma, of which the name Rhabdosoma is a synonym. Meanwhile 

 in tlie year 1866,* I proposed for a species having the characters of Bo- 

 court's Rhabdosoma, the name Rhegnops. This genus differs from Car- 

 phophiops in the two nasal plates, and the single pair of geneials. The 

 type is R. msordmis Cope, I. c, from Honduras. 



CONTIA MICHOACANENSIS DugeS MS. 



Muzzle moderately prominent, rounded ; eye moderate ; body cylindric ; 

 tail short, acute at end, not slender. Scales without fossae. 



Rostral plate much wider than high. Internasal small. Frontal large, 

 longer than wide, posterior angle obtuse. Superciliaries moderate, much 

 narrowed anteriorly. Parietals as long as the frontal, rounded posteriorly. 

 The single nasal is narrow and is obliquely placed, being in contact by its 

 posterior border with both the prefrontal and loreal, and not touching the 

 second superior labial. Loreal longer than high. Preocular touching 

 prefrontal and third superior labial. Two postocular, the inferior resting 

 on the fourth and fifth superior labials. Temporals 1-2. Seven superior 

 labials, the third and fourth entering the orbit, the sixth very small. Six 

 inferior labials, of which four are in contact with the geneials ; post- 

 geneials one-third the length of the pregeneials. Between the former and 

 the gastrosteges, seven rows of small scales. Scales in fifteen rows. 

 Gastrosteges, 152 ; anal divided ; urosteges, 37. 



Length of head and body, M. 0.160 ; of tail, .035 ; diameter at middle 

 of body, .005. 



Ground color probably red in life ; in alcohol it is a clear yelloM^ A 

 large black spot covers the frontal, and the superciliaries, less their anterior 

 extremities, surrounds the eye, and terminates on the loreal, and the cor- 

 responding superior labials. It extends also on the antero- internal angles 

 of the parietals. Another black spot forms a wide collar interrupted on 

 the median line below. Then follow thirteen transverse rings, each oc- 



* Proceeds. Academy, Philada., p. 128. 



