FISHES OF TEXAS AND THE RIO GRANDE BASIN. 
99 
35. Zophendum plumbeum (Grd . ). Headwaters of the Canadian River, Llano Estacado (as Dionda 
plumbea types, Girard, 1856, and Girard, 1858, pi. lii, figs. 21-25). Antelope Creek, a trib- 
utary of the Canadian River, and from the Llano Estacado (as Hyborhynchus puniceus types, 
Girard, 1856, and Girard, 1858, pi. lii, figs. 1-5 and 11-15). Twenty miles west of Choctaw 
Agency (as Dionda grisea types, Girard, 1858, pi. lii, figs. 6-10). 
36. Dionda melanops Grd. Buena Vista, Coahuila (types, Girard, 1856, and Girard, 1859, pi. xxvi, 
figs. 17-20). Cuajuco, Monterey, and Cadereita, New Leon, in the waters of the Rio San Juan 
(as Dionda couchi types, Girard, 1856, and Girard, 1859, pi. xxvi, figs. 1-4). Brownsville (as 
Hybognathus melanops, Jordan, 1878). The five types of this species in the National Museum 
(No. 41) very much resemble Dionda episcopa, but differ from it in being a much shorter, 
deeper species. Head, 3f; depth, 3^; eye, 3^; scales, 7-39-4. These specimens are in good 
condition. 
37. Dionda punctifer Garman. Parras, and spring near Saltillo, Coahuila (as Hybognathus ( Dionda ) 
punctifer type, Garman, 1881). 
38. Dionda fluviatilis (Grd.). Near Monterey, New Leon (as Algoma Jluviatilis type, Girard, 1856, 
and Girard, 1859, pi. xxvn, figs. 13-16). 
39. Dionda amara (Grd.). Lagoon near Fort Brown, on the Rio Grande (as Algoma amara type, 
Girard, 1856, and Girard, 1859, pi. xxvii, figs. 17-20). Brownsville (as Hybognathus amarus, 
Jordan, 1878). The type of this species is a single specimen (U. S. N. M. No. 149), 2£ 
inches long, now in very poor condition. Head, 4; eye, 3^; D. i, 9; A. i, 8; scales, 6-35-3. 
Apparently a good species. 
40. Dionda episcopa Grd. Headwaters of the Rio Pecos, and Comanche Spring, a presumed tribu- 
tary of the Rio Grande (types, Girard, 1856). Headwaters of the Rio Pecos (Girard, 1808). 
Rio Nueces (as Dionda texensis types, Girard, 1856, and Girard, 1859, pi. xxvi, figs. 21-24). 
San Felipe Creek and Devil Creek, two tributaries of the Rio Grande (as Dionda argentosa 
types, Girard, 1856, and Girard, 1859, pi. xxvi, figs. 5-8). Johnson Fork of Llano River, 
Kimble County (as Hybognathus flavipinnis types, Cope, 1880). Llano River (Synopsis). Rio 
Comal, New Braunfels (Jordan & Gilbert, 1886). We obtained a single specimen of this 
species in the Comal Spring at New Braunfels, which agrees perfectly with the types. The 
latter consist of 13 specimens (U. S. N. M. No. 45), varying in length from If to 3J inches, 
most of which are in good condition. Several of the types examined give the following : 
Head, 4; depth, 4~; eye, 3J,= snout; D. i, 8; A. I, 7 or 8; scales, 6-38-4. The types of 
Dionda argentosa, 2 specimens, 2 and 3 inches long respectively (U. S. N. M. No. 32), give 
the following: Head, 4; depth, 4; eye, 3-); D., i, 8; A., i, 7; scales, 6-38-4, thus agreeing 
fully with the types of Dionda episcopa. -The color markings are also the same. In Dionda 
amara there is no trace of the plumbeous lateral band and the dark caudal spot to be seen 
in Dionda episcopa, but it is more silvery. In Dionda serena the band and spot are present, 
but very faint. Bottle No. 32, U. S. N. M., contains 12 specimens labeled as the types of 
Dionda argentosa ; these are each about 2$ inches in length and agree well with the types 
of D. episcopa ; they are all in a good state of preservation. 
41. Dionda serena Grd. Rio Sabinal (types, Girard, 1856, and Girard, 1859, pi. xxvi, figs. 9-12). 
Delaware Creek, a tributary of the Rio Pecos (as Dionda papalis types, Girard, 1856, and 
Girard, 1858). Live Oak Creek, a tributary of the Rio Pecos (as Dionda chrysitis types, 
Girard, 1856, and Girard, 1859, pi. xxvi, figs. 13-16). Brownsville (as Hybognathus serenus, 
Jordan, 1878). Upper waters of Wallace Creek, one of the heads of Medina River (as 
Hybognathus nigrotceniata types, Cope, 1880). Medina River (as Hybognathus nigrotceniatus, 
Synopsis). The types of Dionda serena are two specimens, 2 and 3 inches long (U. S. N. M. 
No. 43), in fair condition; head, 4J; depth, 4|; eye, 3£. Two other specimens from Pecos 
River, collected by Capt. John Pope, are probably the types of Dionda papalis ; these fully 
agree with the types of D. serena. This species differs from D. episcopa chiefly in the more 
slender body, more pointed nose, somewhat smaller eye, and larger scales. 
42. Hybognathus nuchalis Agassiz. Rio Grande near San Ildefonso, N. Mex. (Cope & Yarrow, 
1875). Red River at Fulton, Ark., Sabine River at Longview, and Trinity River at Dallas 
(Jordan & Gilbert, 1886). We found this species very abundant in the Neches River east 
of Palestine, in Trinity River at Magnolia Point, and in Big White Oak Bayou at Houston. 
Fulton Creek, near Creswell (Coate). 
