342 REPORT OF NATIONAL MUSEUM, 1898. 



frouto parietal aud a temporal scute. Supraocular scales jjolygoual, in 

 two or three longitudinal rows, surrounded by scutella; those of the 

 internal row are relatively large and are wider than long. Labial 

 scales rectangular, eight above and ten below; above the upper ones 

 there are one or two series of elongated, x)rojecting scales. Auditory 

 meatus bordered anteriorly with iiat scales, wide and pointed, larger 

 even than the keeled scales which border them in front. Scales of the 

 neck and back short, obtuse, with the keel not prolonged and the notch 

 indistinct; they are arranged in from forty- four to forty-eight oblique 

 rows, which converge posteriorly on the posterior dorsal region, from 

 the nape of the neck to the level of the posterior part of the thighs. The 

 scales on the flanks have the keel prolonged in a point, obliquely directed 

 from below. Tail rather long, depressed at the base, but rounded for 

 the rest of its length, covered with high-keeled scales, one- fourth larger 

 than the dorsal ones, forming transverse rows throughout nearly the 

 entire length. Legs short, covered with scales resembling those on the 

 upper part of the trunk, but a little smaller. Length of tibia scarcely 

 greater than that of the upper surface of the head. Scales of the 

 chest and belly one-third larger than the dorsals, not showing any hol- 

 lowing out on their free borders. Femoral pores large, from thirteen 

 to fifteen under each thigh. In the males there are two large concave 

 scales behind the anus, generally separated from each other by two 

 scutella. 



Measurements. — Total length of the largest specimen, 190 mm. ; length 

 of head from the end of the muzzle to the i^osterior border of the occipi- 

 tal plate, 15.5 mm,; width of head through the temples, 17 mm.; length 

 of trunk from chin to anus, SO mm.; length of tail, 110 mm.; length of 

 tibia, 17 mm. 



Color of upper part of body burnt umber, varied with olive, with a 

 black spot in front of the arm and a brown scai)ular collar bordered on 

 its front edge with yellow. On the middle dorsal region there is a 

 double series of small, dark spots very close together; irregular black 

 spots on the sides form oblique lines extending from the front over the 

 flanks; brown bands cross the legs and tail. The males have the 

 throat blue, with dark lines directed obliquely inward. The sides of 

 the abdomen are also blue, and this color patch is bordered on the 

 inner side with black from the armpit to the groin, from which point 

 the same tint extends over the under side of the thighs. Breast yellow, 

 spotted with gray; median abdominal region yellowish white, as is also 

 the rest of the under side. The females resemble the males in respect 

 to the superior regions, but have their under i)arts yellow and the 

 throat rayed with blue. 



Sceloporus dugesU resembles, at first sight, two distinct species — 

 Sceloporus torquatus, characterized by very large dorsal scales, and 

 Sceloporus fjrammknis, with the same scales relatively small. But this 

 resemblance is only apparent and is due to a similarity of coloration 



