450 



REPORT OF NATIONAL MUSEUM, 1898. 



to vent, 70 mm.; length to gular fold, 14.5 tnm.; leugtb of fore leg, 27 

 mm.; length of fore foot, 10 laui.; length of hind leg, 45 mm.; length 

 of bind foot, 1G.5 mm.; length of head to interoccipital border, IG mm.; 

 length of occipital horn, 7 mm.; length of internal temporal horn, 5.5 

 mm.; Avidth of head (greatest), 25 mm.; width of head between super- 

 ciliary angles, 13 mm.; width of body at middle, 31 mm. 



The color above is light at^hen, in the male with an orange tinge, 

 which was no doubt much more distinct in the living than in the alco- 

 holic specimen. A narrow median brown line extends from tbe parietal 

 foramen to the rump. On each side of this are two rows of round 

 brown spots or ocelli, as they have a pale interior and a brown central 

 dot. These form three transverse rows, the anterior behind the axilhe 

 and the posterior just anterior to the groin. The four longitudinal 

 series are continued on the tail, where they are arranged transversely. 

 Horns pale in the female, orange in the male. Head unspotted; limbs 

 with obscure cross bands; inferior surfaces unspotted, except a short 

 black line at the position of the omphalomeseraic fissure. The colora 

 tion is peculiar in the absence of the lateral cervical spots. There is 

 no trace in the female, and a faint longitudinal shade well posterior to 

 the head only in. the male. 



This peculiar species inhabits the Colorado Desert; it presents the 

 usual character of desert species in its well-developed cranial spines. 

 The scales, on the other hand, do not display this character, as they are 

 less spinous than those of anj^ other species, either of this genus or of 

 Phrynosoma. 



Anoia maceailii HalloweU. 



NYCTISAURA. 



Xlfclisaura Gkay, Cat. Liz. Brit. Mus., 1st ed., 1845, p. 5. 

 Xyctisatira Cope, Proc. Acad. Nat. Sci. Phila., 1864, p. 225. 

 Oeckonoidca Gill, Smithsonian Report for 188.5, 1886, p. 7H<). 



Petrosal bone produced anterior to anterior semicircular canal, and 

 not articulating above with the edge of the parietal. Clavicle expanded 

 proximally. Olfactory lobes underarched by frontal bone. Epiptery- 

 goid present. Hemipenis calyculate. Teeth pleurodont. 



The visceral characters of this superfamily resemble those of the 

 Pachyglossa. There is a colon which mostly i)resents a caecum, but the 

 latter I did not find in Sphwrodactyhis. The right lobe of the liver is 

 much produced, and the prolongation sends a process backward, Avhich 

 1 have only observed elsewhere in the Lacertida'. I found no corpus 

 adiposum in Thecadactylus, PhyllodacUjlus, Ooiiatodes, or iSphcvrodac- 



