elgenmann : collections of flshes from paraguay. 123 



Callichthyid^e. 



33. Callichthys callichthys Linnaeus. 



Two specimens from Bahia Negra (412). 



34. Hoplostei'num pectoralis (Boulenger). 



Two specimens from a swamp near Ascuncion (297). 

 Two others, Laguna Pasito, at Ascuncion (463). 



35. Hoplostemum Uttorale (Hancock). 

 One specimen from Bahia Negra (411). 



36. Corydoras microps Eigenmann and Kennedy (Plate XXXVIII., 



Figs. 2, 3). 

 Four specimens, mountain stream, Sapucay, central Paraguay 

 (453), six from small brooks at Colonia Gonzales, Villa Rica (467). 



37. Corydoras aurofrenatus Eigenmann and Kennedy (Plate 



XXXVIII., Fig. 4). 

 Two specimens, small brook at Villa Rica (472). 



38. Corydoras australe Eigenmann and Ward, sp. nov. 



Type No. 10129, one specimen, Corumba (304). Cotypes, 10130, 

 five specimens Corumba (304) ; two specimens (447), tributary of the 

 Rio Pilcomayo. 



This species is very closely related to hastatus and may be identical 

 with it. The coloration of the caudal in the two species is identical, 

 but the lateral band in hastatus is jet-black, while in this species it is 

 an indistinct line. 



Anterior profile strongly rounded and nearly vertical to the nostrils, 

 less steep and almost straight from nares to dorsal. Head slightly 

 longer than deep ; width 1^3 in its length ; occipital process slender 

 and triangular, meeting the dorsal plate ; fontanel quite elongate, ex- 

 tending into the occipital bone ; preorbital small. Eye very large, 

 orbit one in the snout, 3 in the head, I'fz in interorbital. Mouth 

 inferior, snout rounded, short ; rictal barbels extending to middle of 

 eye ; lower lip terminating in two barbels. Coracoid process striate, 

 forming a ridge on the side of belly. Distance of the dorsal spine 

 from the snout 2 in the length, height of dorsal spine a little less than 

 length of head. Caudal deeply forked. Pectoral spine longer than 

 dorsal spine, its surface striate, comparatively free from serrations. 

 Straw color. An indistinct dusky line from gills to base of caudal, 

 terminating in a large arrow-shaped spot which is bordered posteriorly 

 with white, which itself is narrowly margined with blackish, the 

 caudal dusky beyond (as in hastatus'). A faint line from behind 



