ANNOTATED LIST OF THE SPECIES 87 
slightly converging, longer (16 mm.) in type and large specimens than the space 
between their bases (11 mm. in type); the processes shorter than the space in the 
smallest; interorbital equals the snout plus the eye; maxillary barbel reaching to 
or a little beyond origin of pectoral; teeth feeble or none; a large pectoral pore. 
Dorsal rays nearly coterminous; caudal rounded, equals distance between 
snout and pectoral; anal rounded, its base 5.5—6.6 in the length; ventrals not reach- 
ing the anal; pectoral spines much longer than the head, reaching beyond coracoid 
process, to the ventrals; both margins with strong hooks. A rhomboidal area in 
front of the dorsal, including the entire top of the head, lilac to brown; two blotches 
of similar color behind the dorsal; the body dark, with a few small light spots, 
barbels banded; fins black with a few lighter spots, the tips narrowly light. 
Near coracoideus, differing as indicated above. 
9. BUNOCEPHALUS CORACOIDEUS (Cope) 
Dysichthys coracoideus Cope, 1874, Proc. Acad. Nat. Sci. Phila., XX VI, 133, Nauta; 
Cope, 1878, Proc. Amer. Phil. Soc., XVII, 681, Nauta; 
Eigenmann and Eigenmann, 1890, Occ. Papers Cal. Acad. Sci., I, 20; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 380. 
Bunocephalus bicolor Haseman (part), 1911, b, Ann. Carnegie Mus., VII, 321. 
Cope erected the genus Dysichthys upon the supposed absence of all barbels 
except the maxillary. Haseman examined the types and says that all barbels are 
present, although minute in small specimens and increasing with age. 
Known only from the types collected at Nauta, in the Museum of the Phila- 
delphia Academy, and from Haseman’s specimens at Pittsburgh. 
Family II: Pimelodidae 
A family of many genera and species, many individuals, widely dispersed, 
many of extreme size, both large and small. Catfishes with nares remote, with six 
barbels, and with well-developed adipose; teeth villiform, in bands. In common 
with the Siluridae having the reduced maxillaries, the margins of the upper jaws 
formed by the premaxillaries alone. Gill-membranes usually free from the isthmus, 
but sometimes freely united across it; nares widely separated, without barbels. 
Subfamily: CALLOPHYSINAE 
Distinguished from the Ariinae by the well-developed adipose, the six barbels, 
and the widely spaced nares; from the nearby Pimelodinae by the incisor-like 
teeth, which form a double series above, and a single series below. 
Genus 3: CALLOPHYSUS Miiller and Troschel 
Callophysus Miiller and Troschel, 1849, Horae Ichth., IIT, 1, sp.; 
Bleeker, 1863, Nederl. Tijdsch. Dierk., I, 101, macropterus; 
Eigenmann and EKigenmann, 1890, Occ. Papers Cal. Acad. Sei., 1, 94; 
Eigenmann, 1912, Mem. Carnegie Mus., V, 148. 
