Haseman: Expedition to Central South Amkkica. 335 



dorsal ami anal black; onK- a few spots in tin- tij) of tlic soft dorsal; 

 head 2.5; depth 1.84; no wliitc line from eye to snout; less than twenty- 

 four scales in median lateral series. 



I am inclined to think that Ilcros centralis llolmherg is a synonym 

 of this species. 



16. A. vittatus (Meckel). 

 A. syspilus Cope. 



No. 25250-&, 1.6 cm., Manaos, Nov. 30, 1909. 



This species was not found in either the Guapore or Paraguay basins. 



I have examined the type of Accra syspilus (Cope). It is a syn- 

 on>ni of .1. vitlaliis. 



17. A. guaporensis, sp. nov. (Plate LIV.) 



No. 2575, type, 5.4 cm., Sao Antonio de Guapore, July 9, 1909. 



Length to base of caudal 5.4 cm., greatest depth 2.8 cm.; length 

 of head 2 cm.; preorbital width .45 cm.; diameter of eye 8 cm.; length 

 of snout .8 cm.; interorbital space .8; A. Ill, 7; D. XV, 9; scales 3.5- 



II-I4 . Ml 1 



25-9; pores ; six or seven gill-rakers on the lower anterior arch; 



maxillaries extending to front margins of eyes; fold of the lower lip 

 continuous; cheeks with three rows of scales; preoperculum scaleless; 

 1.5 scales between the lateral line and first dorsal rays; dorsal spines 

 subequal from the fourth, which is one-half as long as the head; 

 dorsal and anal rays extending to middle of caudal; pectoral lin 1.2 

 times the length of the head; ventral fins extending beyond the origin 

 of anal; caudal fin round; caudal peduncle two-thirds as long as deep; 

 fins all scaleless excepting the base of caudal; greatly arched from 

 head to origin of dorsal; the dorsal posterior half of body much com- 

 pressed; seven cross-bands, the third of which has a black spot between 

 the eighth to twelfth pore of the lateral line; a small dark spot on 

 the upper edge of base of caudal; fins spotless, but the edges of dorsal 

 and anal very black; no spot or bar beneath the eyes. 



This species appears to be intermediate between A. tetramerns and 

 A. paraguayensis both in structure and habitat. A. paraguayensis is 

 the southern form and is not found as far north as the Madeira basin. 

 A. tetramerus ranges to the north and is not found in the Paraguay 

 river. 



18. A. awani, sp. nov. (Plate LV.) 



No. 2576, type, 14.5 cm., Sao Antonio de Guapore, Rio Guapore, 

 July 31, 1909. 



