288 PROCEEDINGS OF THE ACADEMY OP 



3.4 in total without caudal. Ten principal bristles, the longest 

 not extending to hinder margin of orbit. Dorsal spine longer, 1..5 

 times in length anterior to it ; pectoral reaching beyond base of 

 ventrals. Ten plates from anal to caudal, five between dorsals. 

 Color brown, with many closely placed yellow spots. Length 

 .097 m. With the last; two specimens. 



CHiETOSTOMUS VARIOLTJS, Cope, sp. nov. 



This species has a much narrower unossified labial margin than 

 the last, the muzzle being entirely covered above to near the lip. 

 Thirteen principal opercular spines which do not extend bej^ond 

 the line of the orbit ; three of them longer and subequal. Loreal 

 region vertical. Scuta between dorsals 6, between anal and caudal 

 10. Dorsal spine 1.5 times length from its base to muzzle. Pec- 

 toral spine a little beyond base of ventral. Ridges of scuta re- 

 presented by rows of bristles, which give them a hoary appearance. 

 No keels. 



Length .068 m. Color bright brown, with numerous large round 

 yellow spots ; belly unspotted. With the last. 



CH^TOSTOMUS TECTIEOSTRIS, Cope, sp. nov. 



Naked labial band as wide as space between nares and orbit. 

 Only eleven preopercular spines, of which two posterior are sub- 

 equal, longer, and reaching a little beyond line of orbit. Loreal 

 region oblique, neai'ly plane. Dorsal spine 1.66 times in length 

 in advance of it. Pectoral spines to a little bej'ond ventral. 

 Scuta between dorsals 5, behind anal 10. The scuta are serrate 

 ridged as in G. alga. The muzzle is ridged on the median line, 

 and the sides slope gradually on each side ; no other ridges on 

 the head. 



Black, with minute yellow dots above and below. Length .13 

 m., greatest width of head .031. Two specimens. 



CH^TOSTOMUS SERICEUS, Cope, sp. nov. 



This species has a more elongate body than the others here de- 

 scribed, the length containing that of the head 4.25 times, and 

 the width 3.5 times. The head is thus wide and flat, and the 

 naked portion is reduced to a very narrow band along the margin 

 of the muzzle. Latter convex in section, loreal region concave. 

 Eleven spines, the posterior not quite reaching line of posterior 



[February 13, 



