THE BATRACHIA OF NORTH AIMERICA. 389 



the groin. It is sometimes ouly indicated by a line of black specks, 

 forming a border above and below. A pale line from eye to front of 

 humerus. Numerous rather large black spots on the groin and numer- 

 ous smaller ones on the posterior face of the femur, between which the 

 color is often dark red. Small black spots on posterior faces of tibia and 

 astragalus, anterior edge of tibia, and posterior edge of humerus. Digits 

 with a light spot at each phalangeal articulation. Belly yellowish, with 

 or without a faint coarse reticulation of a darker color. 



Measurements. 



M. 



Lengtli of head, and body ..„...o 041 



Length of head, to rictus oris , 006 



Length to axilla, asially ^ . 015 



Length of fore limb o*n front . 022 



Length of fore foot 0095 



Length of hind, limb from anus 046 



Length of hind, foot 023 



Width of head at rictus oris 010 



Width of extended, femora * 031 



As compared with the H. oxyfhinus of Boulenger (Ann. Mag. Nat. 

 Hist., 1883, p. 344), this frog has much shorter hind legs and a different 

 coloration, as well as some web between the toes, judging from Dr. 

 Boulenger's description. The R. oxyrhinus comes from western Mexico. 

 The H. variolosus is common in Central America and southern Mexico. 



This species has been found thus far only in the neighborhood of 

 San Diego, in Nueces County, in southwestern Texas. A number of 

 specimens have been brought from that locality and been obtained for 

 the United States National Museum, by William Taylor. 



DENDEOBATID^.* 



Cope, Nat. Hist. Ee v., 1865, and Jouru. Ac. Phila., 1867. 



Hylaplesiid(e Gnnth., Cat. Ba.tr. Sa,]. Brit. Mns., 1856; Mivart, Proceed. Zool. 

 Soc. Lond. 



There are but two genera of this family and they agree in the follow- 

 ing characters : 



O. o. prefrontalia widely separated; ethmoid broad, ossified to ex- 

 tremity of muzzle ; no parotoid glands or metatarsal shovel ; terminal 

 phalanges with two divaricate limbs supporting dilations ; tongue nar- 

 row, free, and entire behind. 



They differ as follows : 



" Omosteruum and sternum with bony styles " ManteUa Bonl. 



Omosternum weak, semlossifled ; sternum cartilaginous Dendrohates Wagl. 



The species of these genera are distributed as follows : Mantella, 4 

 species, Madagascar ; Dendrobates, 8 species. Central American, Colom- 

 bian, and Brazilian regions of Neotropical realm. 



* Plate 74. 



