104 Zoological Society :—— 
of square keeled scales, every fourth ring being larger, prominent ; 
the under side with rings of small square shields. 
PoriopoGAsTeR Gray, A. Smith, MS. 
Brown, yellowish beneath. 
Hab. ? British Museum. 
Mr. Cope, to whom I have shown the specimen of this species, has 
drawn my attention to the genus Xantusia of Professor Baird, no- 
ticed in the ‘ Proceedings of the Academy of Natural Sciences’ for 
1858, p. 255, which agrees with it in many particulars, but is cer- 
tainly distinct, though probably belonging to the same family, Xan- 
tusiide, which may be characterized by the form of the tongue, the 
front fold on the throat uniting the ears, and the absence of the eyelids. 
Professor Baird describes the pupil of Xantusia as vertical ; in our 
genus it is circular. 
This similarity to Xantusia makes it probable that this genus 
is from Lower California. 
M. Auguste Duméril, in the ‘Revue et Magasin de Zoologie’ for 
1852, describes and figures a new genus of Saurian under the name 
of Lepidophyma flavimaculata (t. 17), from the province of Peten 
in Central America, which resembles this Lizard in many particulars; 
but he particularly says that it has no femoral pores, which he says 
are found in all the Zonures with which he has compared it. 
M. Duméril’s genus is probably the same as the Xantusia of 
Baird; but cannot be the same as the one here described, which is 
peculiar, not only from having large femoral pores, but pores on the 
ventral shield as well. 
May 12, 1863.—E. W. H. Holdsworth, Esq., F.Z.S., in the Chair. 
On a New Species or CAuuiste From Costa Rica. 
By Ossert Sauvin, M.A., F.Z.S. 
CauuisTe Dowti, sp. nov. 
Supra nigra: dorso vix viridi lavato, plumis nuche et laterum 
colli utrinque argentescenti-viridt terminatis, pilei margine pos- 
tico ochracescente marginato: uropygio argentescenti-viridi, tec- 
tricibus superioribus rectricum cyaneis: subtus gula tota nigra: 
pectore superiore nigro, plumis viridescenti-cinnamomeo termi- 
natis : ventre imo cum crisso et lateribus cinnamomeis, pectore 
inferiore paulo dilutiore: primariis usque ad terminos, secun- 
darits, tectricibus alarum et rectricibus omnino nigris, pogoniis 
externis omnium eyaneo marginatis, tectricibus subalaribus 
albis, vix cinnamomeis ; campterio cyaneo, albo vittato: rostro 
nigro, mandibule inferioris basi albida : pedibus flavo-nigris. 
Long. tot. 5°25, alee 2°9, caudze 2, tarsi 75, poll. angl. 
Hab. Costa Rica. 
This is a very distinct species, and unlike any of the genus. The 
greenish-silvery feathers of the neck and the green uropygium sug- 
gest the group which Dr. Sclater unites under the head of Procnopis, 
as its proper position in the genus, its nearest ally being the New 
Granadian C. nigriviridis, from which, however, it differs essentially. 
