19G 



lUII.LKTlN ;il, IINH'KU STATKS NA'lloNAL MTSKIM. 



1 



M '?, 



lack the red si»(»ts, aixl ollieis liavo palor hi'Ilies, itvsoniUliiig tiius tlio 

 darker Fiusciu. Tlii' si/e is the siune. 



Fill. -to. Pcuviiipniithiin/iifCti (firiculdta. Xo. — . ; J. 



Ill tlie youii^' of IK/Ksca tlicie is ii .sciies of piiikisli iiKioiiiplelt I.v 

 sejiiinited alternating spots, in two series, eoverin;,' ilie wliole, dorsal 

 re>;i()n; tliey are rarely so well distinjjiiislied or so brijjjlit as in tlic 

 specimen of the same which furnished the type of IFollirook's S. (juatl- 

 rimaviildtd. The pink fades to oraiif^e brown or oclii r, and to pale lirowii, 

 with a^'e, and at the fnllest maturity all are lost in a uniform blackisli 



Mvasiinminln of Xo. (W.)2, in incites. 



IllCllt'H. 



Lciiji,'(li axial, from siioiit to rictus oris :i 



Leiij,'!!!, axial, tVoiii snout ti> axilla 71 



Lt'iij,'tli, axial, I'loin Niiont to ^roiii l.;t:, 



Lciijjtli, axial, from snout to end of vent '2.'.i 



Lcn!^;li. axial, from snout to end of tail 4.(i 



Len<;t!i of fore limli Iv! 



Length of fore foot I"> 



Lengtli of hind limb (i-J 



l,eiij,'th of hind foot "Jii 



Width of sole foot 1(1 



AVidtli of head at rictus oris. :i7.") 



Width of body at miildle .'if) 



Habitat, etc. — This si)ecies lives chiefly JUiionj; the stones in the many 

 shallow rivulets iind springs of the hilly and monntainons regions 

 of the country. It is not so partial to deeper iind stiller waters as tlie 

 Spclcriirs ruber, hut prefers the rapid and shallow streamlets; here it 

 may be found under every stone, or its delicate larva may be ob.served 

 darting rapidly from jdacy to place, seeking concealment among mud 

 and leaves. The />. fusat is one of the most active and vigorous of our 

 species. The i)eciiliiir structure of tlu^ temporal muscle and its ten- 

 dons, and of the occipital condyles, with the siriiigth of the bones of 

 the front, enable it to bnri'ow among stones and in earth more readily 

 than the species of other genera. When pursued, it runs ami wriggles 

 out of sight with the gretitest rapidity, and is (piickly concealed by as- 

 sistance of its dusky c(dors. 



Professor Baird originally noticed the enritais disi)osition of the eggs 

 iu this species, which I have verified on a lew occasions. As in the 



J 



M 

 17 



47 

 fi8 

 OH 



