30 
cave; occipital with two series of spines increasing in 
size backward; two carinae in the plates betweeu the 
occipital and the plate before the dorsal whicli has a 
single, median ridge. 
Margin of head granulai*, lower surface of head 
naked ; upper plates oí body in front of dorsal faintly 
carinate, other plates hispid; lateral carinae approxima- 
ted on the 22nd plate. Dorsal spine a little less than 
head ; caudal emarginate, its outer rays not (?) prolon- 
ged ; pectorals reaching ventrais, ventrals reaching anal. 
Straw color, the fins faintly spotted. 
L. macrodon seems to be the most closely allied 
to this our new species. 
lype: A specimen 100 mm. long from Piraci¬ 
caba, Piracicaba-Ri ver, State ot S. Paulo.* 
Aspidoras n- g- 
This new genus is apparently closely related to 
Corydoras , but difíerring from it, as also Callichthys 
and Hoplosternum, by having two pairs of niichal plates 
between the occipital and the base of the dorsal ; the 
occipital plate nearly truly hexagonal, the posterior angle 
not mueh produced. The head is rather elevated, not 
depressed, rounded in front and somewhat compressed 
laterally. fne coracoid plates entirely hidden by the skin. 
Barbeis shoit, not reaching the gill-openings. 
Type : íspidoras rochai n. sp. 
Aspidoras rochai n . sp. 
D. I, 7 - 8 ; P. I, 7; lateral plates LM / 26 ; Length of 
head 3 % times in length of body. Hight of body so- 
