276 Illinois State Laboratory of Natural History. 

 Tropidoclonium, Cope. 



Cope, Proc. Acad. Nat. Sci. Phila., 1860, p. 76. 

 Microps (preoccupied in Coleoptera), Hallowell, Proc. Acad. 

 Nat. Sci. Phila., VIII., 1856, p. 240. 



Dorsal scales carinated. Rostral plate normal. Two in- 

 ternasals. Two prefrontals. One nasal, grooved below the 

 nostril. Loreal present. One anteorbital. Two postorbitals. 

 Head small, not distinct. Teeth small, isodont. Anal not 

 divided. Tail short. 



The genus is here restricted to the species for which it 

 was originally proposed. 



Tropidoclonium lineatum, Hallowell. 



Mirro'ps lineatus, Hallowell, Proc. Acad. Nat. Sci. Phila., VIII., 

 1856, p. 241. 



Tropldodonioii /iiitatiuii. Cope, Proc. Acad. Nat. Sci. Phila., 

 1860, p. 76. 



Htorerhi Uneata, S. Garman, Mem. Mus. Comp. Zool., 1883, pp. 

 32, 143. 



Head small, not distinct. Tail short, tapering abruptly. 

 Dorsal scales in nineteen rows; the two outer rows on each 

 side larger than the others, smooth and shining; first row 

 without carinse, second row with a faint carina at the base of 

 each scale; third row with the outer halves of scales polished 

 but with distinct carina. Frontal plate longer than wide, the 

 sides parallel. One anteorbital. Two postorbitals. Eye small, 

 above the third labial. Supralabials six or seven, third and 

 fourth largest, fifth crov/ded away from the margin. Ventrals 

 150. Subcaudals 26. 



Color above brown, with a yellow-gray median stripe one 

 and two half scales wide extending from the occiput to the tip 

 of the tail, and with three outer rows of dorsal scales of the 

 same color on each side. A distinct black spot at the base of ' 

 each scale of the outer row. Head above olive-brown; supra- 

 labials yellow-gray. Ash-gray beneath, becoming yellowish on 

 the head and tail. Each ventral plate with a transverse black 

 spot on the middle of its base. The spots behind the first ten 

 each with a median posterior notch, the notches becoming 

 gradually deeper posteriorly and for a short distance before 



