146 ON THE BATRACHIA AND REPTILIA OF COSTA RICA. 



This species is allied to the C. calligaster, differing in its physiognomy and 

 coloration as well as in some technical characters. Thus the loreal plate is larger 

 and differently formed, and the tail is longer and stouter. It is less than one-fifth 

 the length in the C. calligaster. 



107. CONTIA CALLIGASTER, Cope, Sp. DOV. 



Form stout, head little distinct. Teeth gradually increasing in length to the 

 posterior, which is smooth. Scales smooth, poreless; one nasal plate, a subquadrate 

 loreal, one pre- and two postoculars. Muzzle narrowed; side of frontal plate longer 

 than the front, not reaching the preocular. Superior labials seven, third and fourth 

 bounding orbit; temporals 1-1-2. Inferior labials eight, fourth and fifth largest, 

 first barely in contact behind symphyseal. Scales acuminate, in seventeen rows. 

 Gastrosteges 152, anal double; the urosteges 46. Pre- and postgeneials equal. 



Color above dark brown, with a narrow vertebral black band. Two lateral 

 paler bands, on the first and second and fourth and fifth rows of scales, the space 

 between black. A black band along the ends of the gastrosteges ; belly yellow, 

 except a series of black crescents on the median front of each suture. Labials 

 broadly black bordered. Middle line of tail below black. In a second specimen 

 there is an additional superior labial in front of the orbit, and the temporals are 

 1-2-2. The lateral light lines are wide and indistinct, and the entire base of each 

 gastrostege is black. 



From the Pico Blanco. 



108. Catostoma psephotum, Cope, sp. nov. 



Scales in seventeen longitudinal rows, keeled except the inferior. Form rather 

 slender, the head moderately distinct. Maxillary teeth extending as far as the 

 posterior border of the first upper labial. Front somewhat convex, internasals four- 

 sided. Frontal with convex anterior suture, and lateral and two posterior sutures 

 subequal. Orbit bounded by the prefrontal and large loreal ; nasal undivided. 

 Postorbitals two, temporals 1-2—2. Superior labials six, fourth immediately under 

 orbit, but the third touching it ; sixth longest. Inferior labials six, first pair 

 'joined behind symphyseal; all these, with the pregeneials, tuberculate (in one 

 specimen). A pair of short postgeneials. Median keels stronger than the others ; 

 tail with triangular section. Gastrosteges 162; anal entire; urosteges 73. Color 

 above uniform black; below black with the half or less of an occasional scutum 

 red, forming a tesselated pattern ; but few spots on the urosteges. 



M. 



Total length 480 



Length of tail 128 



" to rictus oris . . . . . . . . . .010 



Width of head behind 008 



