120 Annals of the Carnegie Museum. 



rior margin of eye ; caudal with numerous accessory rays, slightly 

 emarginate, the upper lobe longest, longer than pectoral ; anal inserted 

 below the end of the dorsal ; ventrals short, reaching the vent ; vent 

 equidistant from tip of mouth and tip of caudal. 



Straw-color, back with numerous large, conspicuous, stejlate, black 

 chromatophores and many more smaller, much less conspicuous, brown 

 ones ; sides with a few small stellate, black, chromatophores, gradually 

 giving rise to a regular series along the middle of the tail; a dusky 

 streak along the sides between the myotomes of the body and the thin 

 covering of the abdominal cavity ; a small, intense black spot at the 

 base of the middle caudal ray; middle caudal rays dark, becoming 

 intensely black toward tip ; oblique bars extending from the end of 

 the second ray below median dark one downward and forward to the 

 tip of the lower caudal fulcra and then as a black line forward along 

 the tips of the fulcra ; another one like it in all respects from the tip 

 of the second ray above the median dark one upward and forward to 

 the tip of the caudal fulcra and then forward along their tips as a black 

 line ; remaining fins more or less dotted. 



Alimentary canal straight, without convolutions or bends, the thin- 

 walled stomach lying lengthwise and giving rise to a short, thin in- 

 testine which merges into the much longer and larger, but thin-walled 

 large intestine which appears to be filled with minute grains of sand. 



LORICARIIDiE. 



22. Hemiodontichthys acipenserinus Eigenmann and Eigenmann. 



(Plate XXXV., Fig. i). 

 One specimen. Corumba (No. 333). 



23. Sturisoma robusta (Regan) (Plate XXXVI., Figs. 1-3). 

 One specimen from Corumba (354). 



24. Loricaria typus (Bleeker) (Plate XXXV., Figs. 2, 3). 



Four specimens from Corumba (331), one from Puerto Max (406), 

 and two from Laguna Pasito, Ascuncion (460). 



25. Loricaria apeltogaster Boulenger. 

 One specimen, Corumba (348). 



This specimen differs from the other specimens described in having 

 the entire surface of the lower lip covered with short cirri. 



26. Loricaria carinata Castelnau (Plate XXXVII., Figs. 1-2). 



One specimen from Puerto Max (405) and two from Corumba 

 (330). Three from a brook at Villa Rica (465). 



