NO. 1556. LIST OF CHARACIN FISHES— EIGENMANN AND OGLE. 11 



not (]ulte to anal; dorsal over posterior third of ventrals. Caudal 

 margin dusky; anal margin to the anterior lobe black, two or three 

 spots continuing the black to the beginning of the second third of the 

 first full-lengtli ra\"s; ventrals dusky; dorsal with its basal half and 

 last ra3's black; no humeral spot; back peppered, a f(^w large cells on 

 the opercle. 



Named in honor of Dr. Richard Rathbun, of the U. S. National 

 Museum. 



Aphyocharax stramineus Eigernnann, ne-w species. 



.l;j//?/ocoara.c aZiwr/; H.s EiGENM ANN and Kennedy, Proc. Afad. Nat. S^ci. I'liila., 1903. 

 p. 517. Not of Giinther. 



Type. — No. 10030. Museum of Indiana University. Specimen 25 

 mm. to base of caudal, Arroyo Trementina. " 



Head 4; depth 3; D. 10; A. 19; scales 5-35-3 (to ventrals): eye 2| 

 in head; snout little more than half the e3'e in length; dt)rsal and ven- 

 tral outlines equally arched; mouth very minute; premaxillar}' with 7 

 teeth; maxillary short, its anterior face below the teeth semicircular, 

 about 2 teeth on its upper part; al^out 9 teeth on each side of the lower 

 jaw; maxillar}^ reaching to below posterior nostrils: pectoral not 

 reaching ventrals by 2 scales; \entrals not to anal; origin of dorsal 

 over last third of ventrals; adipose well developed; no distinct mark- 

 ings on tins. A comparison of this specimen with specimens of A. 

 aJhiirnuK makes it certain that it is distinct. 



Holopristes riddlei Meek, new species. 



The two species of Holopristes may l)e distinguished as follows: 



a Humeral spot surrounded by a bright ring; caudal spot dark lirown, tinw other- 

 wise plain; a sharp gray line between humeral and caudal si>ots; caudal [)artly 

 scaled, the peduncle very slender; dorsal posterior to origin of ventral; 6-8 

 scales of the lateral line perforate; A. 26-28; head oj-:^?; depth 2'^-2|; scales 



5-31-3^ ocellifet: 



aa A humeral spot, no caudal spot; dorsal, anal, and ventrals each with a con.>^picu- 

 ous, jet-black spot; dorsal spot not extending upon the last ray, and leaving 

 base and tips of raj^s hyaline; anal spot covering the third, fourth, and fifth of 

 the rays forming the anterior lobe; ventral spot leaving the outer and inner 

 rays and bases and tips of all the rays hyaline; head about 4; depth 2.6; scales, 

 33; A. 21-23; eye 2.64 in head; snout 4.12; maxillary 2.2; pectorals not 

 reaching ventrals, ventrals to anal « riddlei. 



This species is named for Dr. Oscar Riddle, who collected it. 



Genus HEMIGRAMMUS Gill. 



This genus differs from Astyana,/' onl}' in the incompleteness of its 

 lateral line. One of its species, i7iconstaiis., here described, varies in 

 this respect, some of the specimens having* the lateral line complete, 



" This description is based on a specimen collected by Dr. Oscar Riddle at Los 

 Ca.-:,ti]las, Venezuela, and now in the collections of the Field Columbian Museum, 

 Chicago. 



