214 CARNEGIE INSTITUTION OF WASHINGTON. 



Fishes New to the Fauna of Porto Rico, by Charles F. Silvester. 



Of the collections made in the vicinity of Guanica by the wiiter during the 

 latter part of May and the early part of June 1915, the fishes, batrachians, and 

 reptiles have proven to be most interesting. The batrachians, reptiles, and 

 crustaceans are being worked up by Henry W. Fowler, of the Academy of 

 Natural Sciences of Philadelphia, whose report will be published shortly. 



More than 100 species of fishes were collected. Of this number about 20 

 per cent were new to the fauna of Porto Rico and 8 per cent were new to 

 science. Following is a preliminary report of the fishes new to science as well 

 as those not heretofore recorded from the island : 



MUR^NESOCIDiE. 

 Mayerina gen. nov. 



Body long, round, pencil-like, same caliber throughout, does not taper in tail region except 

 rather abruptly near end. Teeth uniserial, canine-Uke, sharp, anterior enlarged; single 

 series of sharp canine-like teeth on palatine. Fins very low, rudimentarj^, dorsal and anal 

 beginning behind vent. Distinguished from Stilbiscus Jordan and Bollman in the con- 

 tinuous dorsal and anal fins; pectoral very small and rudimentary. One species known. 



Type, Mayerina mayeri sp. nov. 



Mayerina mayeri sp. nov. 



Head 9.5 in body, 4.3 in tail. Depth same as upper jaw, about 65 in total length. Lower 

 jaw projecting; anterior nostril tube-like, near end of snout; posterior nostril larger, in front 

 of eye. GiU-opening one-half the isthmus, which is same length as snout. AJl fins very 

 rudimentary, microscopic, excepting caudal; pectoral less than one-half width of gill- 

 opening; dorsal and anal begin length of head behind vent and continue as very fine lines to 

 end of taU, where they enlarge into the easily visible caudal. Lateral line present and 

 prominent, with series of microscopic, open pores; blood-vessel follows course of and shows 

 through skin on lateral Une. 



Color in life orange-yellow above; ventral surface slate-blue, merging into whitish in 

 anterior part of tail region ; posterior part of tail entirely yeUow ; iris blue. Tip of lower j aw 

 and area behind ej^e reddish. 



Two specimens of this beautiful little eel were obtained on the sand flats around mangrove 

 Bwamp west of Guanica Harbor at very low tide. 



Length, 31 cm. 



Type, No. 3073, Zoological Musemn, Princeton University. Paratype, No. 3126. Zoo- 

 logical Museum, Princeton University, 28 cm. long. 



(Named for Dr. Alfred G. Mayer, dh-ector of the expedition.) 



ECHELIDiE. 

 Myrophis longleii sp. nov. 



Head 3.5 in trunk, 5.5 in tail. Depth of body at gill-opening 3.3 in head. Upper jaw 

 projecting; teeth sharp, more or less u-regular on maxilla and vomer, indicating two series; 

 series more or less single on mandible. Eye 2 in width of snout between anterior nostrils. 

 Vertical fins well developed; dorsal beginning two-thirds length of head in front of vent, anal 

 beginning directly behind vent; both continuous into caudal, which is wider and completely 

 surrounds end of tail. Anterior nostril tube-like, near end of snout; large pore above this 

 on top of snout. Posterior nostrU, so called, below eye in upper lip. 



Color in life, light ohve-green with very fine punctation above, lighter below. 



Length, 12 cm. 



Type No. 3083, Zoological Museum, Princeton University. 



Dug from sand flats west of Guanica Harbor. 



(Named for Dr. W. H. Longley, in recognition of his investigations upon the color of fishes.) 



OPHICHTHYID^. 

 Myrichthys keckii sp. nov. 



Head 4 in trvmk, 9.5 in total length; eye 3 in snout, which is 2.6 in head. Teeth more 

 or less blunt in single series; vomerine teeth present. Pectoral small, as wide as gill-opening, 



