1S94.] 107 [Cope. 



mens of the A. flavilabria before me, I find that there are but two rows of 

 scales on the cheek, one row on the inferior limb of the preopercle, and 

 one on the interopercle, as I have figured and described. In A. tetra- 

 mera there are three rows on the cheek, and none on the preopercle and 

 interopercle, as described by Steindachner. The preorbital bone is only 

 .6() the diameter of the orbit in A. flavilabi'is, as in the younger A. teira- 

 mera. The front between the orbits is absolutely flat in A. flatilabris, 

 while it is convex at the borders in A. tetramera. All the specimens of 

 A. flavilabris have XVI dorsal spines. In all the lower lip is conspicu- 

 ously yellow, a character not present in the A. tetramera in my collection, 

 nor described by authors. The absence of this characteristic mark is the 

 only fault in my figure.* 



AcAR.v AUTOCHTHON Gthr. Steindachner Sitzber. K. Wien Akad., 1874, 

 December, p. 4. 



SUMMARY. 



The species enumerated in the preceding pages are distributed in fami- 

 lies as follows : 



New Nevv 



Total. Genera. Species. 



Clupeidse 10 



Characinidse 15 3 9 



SternopygidiE 2 



Silurids 14 6 



Symbranchidse 10 



Cyprinodontidse 10 



Cichlidsi 8 2 



Total 42 3 17 



Besides the addition of seventeen species to the fauna of the Jacuhy 

 river, five genera are introduced. Four of these are Characinidaj, viz : 

 Asiphonichthys, Chorimycterus, Diapoma and Pseudocorynopoma. Of 

 these the first three are new to science, and the last has been previously 

 known from the drainage of the La Plata only. The fifth genus is 

 Sternopygus, which has not been enumerated by previous authors as 

 found in the Jacuhy river. 



NOTE. 



^Ir. Smith obtained near Chapada in Matto Grosso from the head 

 waters of the Paraguay, Tetragonopterus Uneatwi Steind. and T. moorei 

 Boul. From the head waters of the Tocantins, not far from the same lo- 

 cality, he obtained a species close to the 2\ caudimaculatus Gthr. 



* Proceeds. Academy Phila., 1872, p. 255., PI. xi, Fig. 4. 



