BANGS : CHIRIQUI MAMMALIA. 47 



from Dr. Thomas's description that it is not his //. salvini nigrescens, but what 

 Gray's H. longicaudatus may be I can only conjecture. The type is extant in 

 the British Museum, but although Dr. Thomas has stated that it is a good 

 species, he has never given any clue to its identity. Gray's original descrip- 

 tion is so meagre that it is unfortunate that Dr. Thomas did not characterize 

 the species when he reinstated it. 



Proechimys centralis chiriquinus Thomas. 



Thirty-one specimens, Divala, November and December, and Bogaba, July ; 

 those from the latter place are topotypes. 



Though very common in the low lands and the foot-hills of the Yolcan de 

 Chiriqui, the spiny rat certainly does not ascend the Volcano to any great 

 height, as Mr. Brown did not find it at Boquete. 



Dasyprocta isthmica Alstox. 



Nine specimens, young and adults, Divala, November, Boquete, 3,500 feet, 

 June, and Bogaba, July. 



Agouti paca virgatus, subsp. nov. 



Type, and only specimen. — Mus. Comp. Zoul., No. 10,079, old ad. $ , Divala, 

 December 16, 1900. 



Characters. — The Central American paca differs from the Brazilian form, 

 true A. paca (Linn.), in being larger, -with larger bind foot ; in having the 

 second stripe on the sides much less broken into spots ; all the spots above the 

 two lateral stripes smaller ; the ground color of upper parts richer brown. 

 Skull much larger ; palate narrower ; audital bullae flatter. 



Color. — Ground color of upper parts, walnut-brown ; feet, hands, and cheeks 

 duller, paler, and shaded with wood-brown ; under parts white ; on the lower 

 sides a white stripe extending from hip to shoulder; above this another white 

 stripe, a little shorter than the first ; these two bands break up on sides of the 

 neck and on flanks into series of white spots, which are much smaller on 

 the flanks ; above the white bands two rows of small white spots, the lower 

 one reaching from sides of neck to flanks ; the upper one very short — made 

 up of only six or seven indistinct spots. 



Measurements. — Type, old ad. ^, total length, 740; tail vertebrae, 22; 

 hind foot, 130; ear, 43. Skull, tj-pe, basal length, 139.6; occipitonasal length, 

 151; zygomatic width, 104; mastoid width, 54.8; interorbital width, 47.2; 

 length of nasals, 51.2; width of nasals, 26; length of palate, to palatal notch, 

 76; width of palate at middle of second molar-form tooth, 7 ; at middle of last 

 molar-form tooth, 10.2 ; upper molar series, 29.6 ; length of single half of man- 

 dible, 107. 



VOL. XXXIX. NO. 2 3 



