182 PROCEEDINGS OF THE ACADEMY OF 



From muzzle to second gular fold 2 in. ; from fold to vent 3 in. 8 lin. ; from 

 vent to end of tail 16 in. ; length of hinder extremity 5 in. 6 lin. 



General color olivaceous, paler below. A white (or ?yellow) band from the 

 superior posterior angle of orbit, which extends half way to the helmet. A 

 rusty-brown band extends from above the tympanum to the posterior part of 

 the back. Three transverse black spots on the nape. 



Habitat. Near Grey town, Nicaragua. Discovered by Dr. Caldwell, who sent 

 specimen 5845 to the Smithsonian Institution. 



Dr. Gray says of his Cristasaura m i t r e 1 1 a, that the scales of the crest 

 are smaller than those of the front, and slightly keeled, also that the dorsal 

 crest is high which is, however, only important specifically when compared 

 with the developement of the helmet. The coloration of that species is also 

 different. It is an inhabitant of Honduras. 



Scartiscus c a d u c u s. 



Char. gen. Body depressed. A median dorsal keel, which forms a low crest 

 on the nape. Tail slender, compressed, covered with appressed equal verticils 

 of weakly-keeled scales. Digits 5 5, without lateral expansions, strongly 

 pectinate inferiorly. Tympanum distinct. Nostrils in a single plate, which 

 is lateral and below the canthus rostralis. Head plates numerous, small, 

 keeled ; interparietal, parietals (in contact) and postparietal only distinguish- 

 able. Pterygoid teeth none ; maxillaries triscuspid. No antepectoral fold. 

 Scales of the body large, flat, caducous, keeled everywhere ; the dorsal in 

 posteriorly convergent series. No femoral or anal pores. 



In this genus of Iguanidse, there are two pairs of abdominal ribs,* connected 

 by a slight linea alba. In Brachysaurus, which resembles Scartiscus in 

 general appearance, these are more numerous ; the external nares also are 

 superior to the canthus rostralis. In Polychrus, the representative of the 

 Gastropleur type with lateral nostrils, the general form and squamation are 

 totally different. The position of the nostril will distinguish Scartiscus from 

 many Huruivagse (e. g. Liocephalus), and the compressed spineless tail will 

 separate it from others. 



Char, specif. Labials very narrow ; inferior, to proc. coron. mand. six, 

 superior four, bounded above by a similar series of seven : symphyseal 

 single. Scales of head everywhere keeled ; two larger superciliary series 

 distinguishable, which are in contact medially. No earlobes. A slight 

 preaxillary fold. A lateral crural keel on each side. Posterior extremities 

 elongate, extending forward to anterior border of orbit. Tibia longer than 

 femur ; foot much longer than tibia or than hand and antebrachium. Ex- 

 ternal toe reaching beyond internal. Brachium shorter than antebrachium ; 

 order of digits, first, fifth, second ; third and fourth nearly equal. Whole 

 anterior extremity reaching nearly to groin. Head to posterior border of 

 tympanum equals longest measurement of tibia. 



Color above brown, with numerous dark brown chevrons, the angles di- 

 rected posteriorly ; a narrow, vertical, yellow line from the axilla. Extremi- 

 ties and tail cross-banded. Beneath yellowish brown, the throat darker, 

 light varied. 



Length of head and body to vent 3 in. 3 lin.; of tail 6 in. 3 lin. ; of anterior 

 extremity 1 in. 6 lin. ; of posterior do. 2 in. 7 lin. 



Habitat. Paraguay. Mus. Smithsonian (No. 5852). Capt. Page's Exped. 



coll. 



Liocephalus p e r s o n a t u s. 



Head shields keeled, not lanceolate. First internasal not in contact with 



* Dr. Fitzinger places Laemanctus among the Gastropleurae, but it seems incorrectly. 

 Laemanctus 1 o n g i p e s is destitute of abdominal ribs. Chauiaeleopsis hernandezii 

 there is one pair which do not meet on the median line. 



[April, 



