ON THE BATRACHIA AND REPTILIA OF COSTA RICA. 145 



Urosteges 25 ; nasals not interrupted by first upper labial ; head dark with a pale 

 occipital spot. T. vermiformis, Hallow, 



aa. Postnasals separated from preocular by a wide space. 



No loreal ; last upper labial larger than sixth ; body above with black and white 

 half-rings. T. semicincta, D. & B. 



A loreal; last upper labial smaller than sixth; body with complete black and white 

 rings. T. atrocincta, D. & B. 



103. Microdromus virgatus, Giintlier, Ann. Magaz. Nat. Hist. 18T2, PI. IV. 

 Unknown to me. 



104. Ninia atrata, Hallow. ; Streptophorus drozii, Dum. Bibr. 

 San Jose ; Dr. Van Patten. 



105. Ninia sebje, D. & B.; subspecies macblata, Peters, Monatsber. K. Preuss. Akad. 1861, p. 924. 



Subspecies tessellatus, Cope. 



This distinct color variety resembles the typical in squamation, as in the nine- 

 teen rows of scales all keeled, seven superior labials with the third and fourth 

 entering the orbit, and in the four lower labials in contact with the geneials. The 

 color above is a rosy brown, marked with numerous transverse bands of black 

 with zigzag borders, as the color covers entire scales. Neck of the same ground 

 color; head above brown. Lower surfaces black, with square 1 red spots on the 

 gastrosteges. This portion of the coloration is quite distinct from that of the N. 

 s. maculata, or other varieties. 



106. CONTIA PACHYURA, Sp. nOV. 



Scales smooth, in seventeen longitudinal rows, generally poreless, sometimes 

 with one pore. Head rather elongate, rostral plate not prominent ; internasals 

 wider than long ; prefontals long as wide. Frontal rather elongate, but shorter 

 than the parietals. Nasals oblique; loreal large, higher than long, encroaching on 

 the single preocular, which does not reach the frontal. Postoculars two, smooth, 

 subequal; temporals 1-1. Superior labials eight, the fourth and fifth entering 

 orbit, the posterior rather low. Geneials equal, rather elongate. The tail is long, 

 entering the total length three and three-fifth times, and is thickened to near the 

 end. Gastrosteges 133; urosteges 50. Total length m. .335. 



The color is black, the lower lateral rows of scales with a rufous shade. Scales 

 of the first row with gray tips. Head blackish-brown, a black line from eye above 

 labials ; latter yellowish, unspotted. Belly yellowish, each scutum with a black 

 extremity. 



From Sipurio. 

 37 



