1895.] FEOM MATTO GEOSSO AlfD PAJBAGUAT. 527 



I regard as identical with H. ihoracatum, and is the same as that 

 for which I propose the name H. </iientheri. In fact 3 species are 

 confounded under H. tlioracatum in Dr. & Mrs. Eigenmanu's 

 Synopsis ; they are distinguishable as follows : — 



I. Throat entirely naked in front of the two pairs 



of pectoral shields ; 6 to 8 pairs of ventral 

 shields separated by a series of azjgos shields ; 

 spine of adipose fin present ; caudal deeply 

 emai'ginate, middle rays half as long as outer . H. (horacatits, Gthr. 



II. A transverse series of four shields in front of 



the pectoral shields ; 3 to 7 pairs of ventral 

 shields and a single azygos shield in front ; 

 posterior dorsal spine usually absent. 



Pectoral spine not reaching origin of anal ; caudal 



deeply emarginate, middle rays half as long as 



outer H. guenthen, Blgr. 



Pectoral spine reaching origin of anal ; caudal less 



deeply emarginate, middle rays much more than 



half as long as outer H. slemdachneri, Blgr. 



9. LOKICAEIA PAEVA, sp. U. 



Teeth small, well developed in both jaws. Head 14 as long 

 as broad, 4| to 5 times in total length ; snout obtusely pointed, 

 feebly projecting beyond the lip ; head-shields with longitudinal, 

 spinulose striae, without keels ; diameter of orbit o| to 6 times 

 in length of head, 2| to 2| times in length of snout, 'l| to 1| in 

 interorbital \\-idth ; a broad postorbital notch ; lower labial fold 

 moderately large, papillose, feebly notched, with a fringe of obtuse 

 papilla?. Dorsal I 7 ; first ray 1^ to 1§ as long as head, just 

 above base of ventral. Pectoral I 6, as long as head or a little 

 shorter, reaching beyond base of ventral. Ventral I 5, as long 

 as pectoral, reaching beyond origin of anal. Anal I 5. Outer 

 caudal rays much produced, filiform, upper longest. Lateral 

 scutes 26-28, ^^ith two spinose ridges approximating on the 13th 

 or 14th; nuchal shields without keels; 16 or 17 scutes between 

 dorsal and caudal, 14 or 15 between anal and caudal. Breast and 

 belly shielded ; pectoral shields numerous, polygonal, irregular ; 

 ventrals 7 to 9 transversely enlarged ones on each side and 3 series 

 of small ones in the middle. All the shields spinulose and 

 striated. Olive above, with iU-defined dark cross-bars ; a dark 

 streak on each side of the snout, from the tip to the eye ; fins 

 with dark spots. 



Total length 110 millim. 



Numerous specimens from Descalvados, Matto Grosso. 



This species is most nearly related to L, filamentosa, Stdr. 



10. LOEICAEIA LABIAXIS, Sp. n. 



Teeth minute, rudimentary, in both jaws. Head If as long as 

 broad, 4^ to 4| times in total length ; snout obtusely pointed, 

 feebly projecting beyond the lip ; head-shields rough ^^^th villose 

 spinules, except on the edge of the end of the snout, without 



