26 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



The measurements of tlie two species appear to vary but little, the 

 four examples of A. cerviniventris now before me ranging in length of 

 wing from 2.15 to 2.30 inches, while the tyjjeof A. yucatanensis measures 

 2.20 ; the length of tail in the latter is 1.60, and in the former series 

 varies from 1.50 to 1.70. The culmen ranges from .70 to .80 in cervini- 

 ventrisy bat the bill of the tyi^e of yucatanensis is unfortunately broken, 

 so that its length cannot be ascertained. 



A. cerviniventris appears to be exclusively an eastern species (as are 

 also A. yucatanensis and A. fuscicaudata), its habitat extending from 

 southeastern Texas to Vera Cruz, and perhaps also to Yucatan, since 

 Mr. Elliot (Synopsis, p. 219) states that he "can perceive no difference 

 between Mexican and Yucatan si)ecimens". The A. cinnamomea appears 

 to be wanting from eastern Mexico, but in the collection of the Ii^ational 

 Museum are specimens from Mazatlan, Tehuantepec, and Yucatan, be- 

 sides San Salvador and Nicaragua, though Mr. Elliot gives only " Guat- 

 emala and Costa Eica" as its habitat. 



UESCRIIPTIOIVS OF NEW SPECIES OF FISHES (rRAlVIB>EA ITIAR- 

 GINATA, POTAIWOCOTTUS BENDIBEI) AND OF MYCTOPHUM 

 €BE]VlIIiAKE J. AND G. 



By TARI.ETON H. BEAN. 



The first two species here mentioned as undescribed formed part of a 

 collection received from Capt. Charles Bendire, U. S. A. Several other 

 species received at the same time are retained for study and comparison 

 with fuller material promised from the same source. 



The Myctoplium was obtained by Mr. W. H. Dall, in the Pacific, off 

 Puget Sound. 



TTranidea marginata, n. s. 



24197; 9 specimens; tributaries of Walla Walla Eiver; Capt. Charles 

 Bendire, U. S. A. 



B. VI ; D. VII-VIII, 18-19 ; A. 15-14 |; V. I, 3 ; P. 13-14 ; C. 14-15. 



This species is allied to Cottus cognatus Eich., but differs from that 

 species in having the vent nearer to the insertion of the caudal than to 

 the snout, while the origin of the anal falls in the vertical from the third 

 dorsal ray instead of the sixth, as in Eichardson's species. The ventral 

 has 1 spine and 3 rays (C cognatus has 1 spine and 4 rays). The longest 

 pectoral rays are shorter than the head (equal to the head in cognatus). 



Head broad, slightly depressed, its greatest length contained a little 

 more than 3 times in length of body without caudal (4 times in total 

 length) ; distance from tip of snout to eye equals length of eye, which is 

 ^ of length of head. Vomerine teeth; none on the palatines. Body 

 stout anteriorly, moderately comi)ressed posteriorly, its height at origin 

 of first dorsal equal to its width at the same place, and contained 4i times 

 in length of body without caudal; the least width of the caudal peduncle 



