100 PROCEEDINGS OF THE ACADEMY OF 



posterior below the other and continuous with the suborbital plates. The 

 latter small, six, median jjair smaller, all separated from orbit by granules. 

 Temporal region with some flat j)lates, side of head granular, no auricular 

 plates. Meatus auditorius large. Six upper, six lower labials ; postgenial 

 large; four large infralabials, two pairs in contact. Gular scales small, larger 

 near rami and collar. Latter distinct, but not free, extending in front of ax- 

 illfE. Abdominal plates in eight rows, larger than dorsal scales, subquadrate, 

 continuous by two rows with preanals ; latter four, posterior pair much larger. 

 Scales of tail smooth below, very weakly keeled above. Dorsal scales sepa- 

 rated by a wide lateral granular region, one row of the former resolving itself 

 into two of the latter. 



The dorsal scales are in transverse series, which alternate with each other 

 on the median line. They are weakly keeled, longer than broad, and rectan- 

 gular : they grow smaller on the interscapular region, and disappear shortly in 

 advance of it. Thirty rows between axilla and groin; 10 — 12 longitudinal. 



Digits all well clawed, and with one row of scales below ; longest finger -TS 

 distance to groin when extended ; longest toe to the gular fold in like manner. 

 Anteljrachium plated above and below, brachium above and behind. Femur 

 plated in front onl}', tibia below only. Outer toe nearly as long as second, 

 inner short. 



Color (in S]iirits) above olivaceous ; sides bluish, with a few very pale dots, 

 hind face of femur similar; under surface head and body light yellow. 



In. Lin. 



Total length 7 



Length to vent 2 5-5 



" to collar. 10-5 



" to end of interparietal plate 6 



" to eye fissure 2 5 



" of forelimb 10-4 



" of hind limb 1 3 



" " foot 7T5 



Width head at angle mandible 4-5 



" " prefrontal bones 2-5 



" " nostrils 1-5 



I take the present opportuniry of correcting a lapsus calami in a former re- 

 view of tlie higher groups of the Reptilia Squamata, where I included the Ec- 

 pleopodida^ under the head of families with the temporal fossa with bony roof. 

 This roof is really dermal onlj- as in the Ameivie, as already mentioned by 

 Peters. 



Mabuia cepedei Gray, Cope, Proc. A. N. Sci. Phila. 1862, 186. 



One sp. (6647) from Napo or Upper Maranon. 

 Ophiognomon trisanalb Cope, gen. et sp. nov. 



Fam. Chalcididic. Nostril on the suture between the first labial and supra- 

 nasal. Head shields above five, viz., two supranasals, one frontal and two oc- 

 cipitals. Limbs minute, four, without digits. Scales smooth, hexagonal, in 

 annuli, those behind vent with a minute pore each. A short longitudinal fold 

 Ijehind axilla. No collar. 



This genus is near Chalcis, but differs in the position of the nostril and cha- 

 racter of the head shields. The latter above are much like those of some 

 Mexican genera of Calamarian serpents, especially Sympholis Cope — name 

 from n<j)/f, serpent, and riiai/zov, a sign. 



Char, specif. Muzzle obtuse, slightly projecting, rostral plate visible from 

 above. Supranasals extensively in contact with each other and the first and 

 second ujjper labials. Frontal large, hexagonal, posterior angle prolonged ; 

 parietals larger, obliquely hexagonal, truncate behind. Two superciliaries ; 

 four superior labials, posterior largest, truncate behind; temporals three on 

 each side, anterior large. Two very small suborbitals, one minute preocular 

 and a square loreal. Symphyseal narrow, inferior labials three, posterior lan- 

 ceolate. Geneial rhombic, large ; infralabials three on each side, anterior pair 



[March, 



