1883.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 357 



on side of head across eye and snout ; upper baud a little uearer to line 

 of back than to middle baud ; a large, irregular black blotch at base of 

 caudal ; behiud this a white blotch of varying size, sometimes reduced 

 to two small spots, sometimes forming a broad white bar, covering 

 nearly half the fin ; behiud this blotch the caudal fin is jet black. Dor- 

 sal white, more or less spotted or edged with black. 



About forty specimens of this very interesting species were taken in 

 the outlet of Lake Drummond in the Dismal Swamp, near Suffolk, Va. 

 The species probably abounds throughout the Dismal Swamp. 



Our specimeus agree in most respects with Putnam's description of 

 Chologaster cornutus Agassiz. This species is still known only from 

 three specimens obtained in a ditch in a rice field at Waccamaw, S. 0. 

 The differences are probably, however, of specific value. 



Compared with its blind relative and perhaps descendant, Typhlich- 

 thys- subtcrraneus Girard, Chologaster avitus is much more slender, with 

 narrower, sharper, and less depressed head, sharper fins, and with the 

 gill membranes less connected to the isthmus. The "horns" on the 

 suout mentioned by Agassiz seem to be the flaps of the nostrils. These 

 are much better developed in Chologaster than in Typhlichthys subterra- 

 neus. 



9. Etheostoma rex Jordan & Everuiaun, sp. nov. (Type No. 39858, U. S. Nat. Mus.) 

 Subgenus Percina Haldetnau, closely allied to E. caprodes. 



Head, 3f in length ; depth, If. D. xiv-15. A.n, 11. Scales 11-83 

 to 85-19. Length of largest specimen, oi inches. 



Body elongate, little compressed, the form more robust than in E. 

 caprodes, the back more elevated ; head stouter, the suout more acumi- 

 nate and the mouth a little larger thau in E. caprodes ; the head simi- 

 larly formed. Cheeks with five rows of small scales; opercles and 

 nape closely scaled; breast naked; gill membranes uearly separate; 

 pseudobrauchi ?e very small; median scales ou ventral line moderately 

 enlarged. Fins higher than in E. caprodes, the longest ray of the soft 

 dorsal slightly more than half head. 



Adult in spirits mottled green above, yellowish below; four dark 

 cross-blotches ou back; about ten roundish dark blotches ou sides, 

 these almost confluent into a baud ; a small black spot at base of cau- 

 dal; no trace in young or eld of parallel cross-bands on side of back, 

 the young with the back covered with zigzag markings, the sides with 

 ten short vertical inky- black blotches about as high as the eye. Second 

 dorsal and caudal in adult yellowish, with oblique cross-stripes of black 

 spots; first dorsal yellowish, mottled, with a mediau dusky baud ; pec- 

 torals yellow, bauded with olive; anal faintly spotted with black. 



In life, the adult example was olive-green, straw-color below; back 

 with five obscure dusky cross-blotches ; nine obscure dark olive cross- 

 blotches ou sides; a small dark caudal spot. Snout aud nape dashed 

 with orange; cheeks yellow; first dorsal pale olive, with darker olive 

 spots at base • a broad band of brilliant orange toward margin, the edge 



