360 Annals of the Carnegie Museum. 



This species, from the Amazon basin and Guiana, differs but little 

 from the Paraguayan //. corunibcc. 



62. Heterogramma trifasciatum Eigenmann and Kennedy. (Plate 



LXVIII.) 

 No. 2743, 2.8 cm., Sao Luiz de Caceres, Rio Paraguay, May 24, 1909. 



Depth 3 ; head 3 ; diameter of eye 2.75 to 3 ; spines subequal from the 

 fourth, which is fully one-half the length of the head, membranes 

 between the dorsal spines greatly prolonged; prolonged ventral rays 

 Avhite and extending beyond the base of the caudal; caudal peduncle 

 a little deeper than long; a broad lateral band; soft dorsal and anal 

 spotted; a band in front of the eye and another one beneath the same; 

 scales 2.5-23-8; an oblique band or stripe from the pectoral to the 

 origin of the anal. 

 No. 27440-^, 2-2.3 cm., Villa Hays, Paraguay, April 13, 1909. 



Head 2.5; vertical fins spotless; anal and ventrals with black 

 margins. 

 No. 27450-e, 1.4-3 cm., Sao Luiz de Caceres, May 26, 1909. 



The smallest one is almost colorless. 

 No. 2746a-&, 1.5-3 cm., Campos Alegre, Rio Jauru, June 4, 1909. 

 No. 2748a-/, 1.8-2.5 cm., Bastos, Rio Alegre of the Rio Guapore, 



June 26, 1909. 



Twenty-two %cales in the series below the lateral line; caudal 

 peduncle as long as deep in some cases. These specimens are slightly 

 more slender and less compressed than the typical Paraguayan forms, 

 but otherwise they are identical. 

 No. 27500-1, 1.2-2.8 cm., Sao Antonio de Guapore, July 31-Aug. 11, 



1909. 



Color very faint; a faint spot in the middle of the lateral band; 

 vertical fins spotless; preorbital one-fourth the diameter of the eye; 

 lateral line incomplete; depth 3.2; pectorals as long as, or longer than, 

 the head; little or no signs of oblique stripes from the pectorals to 

 the origin of the anal. These specimens are intermediate between the 

 typical form and the variety macielense. 



No. 27580-6, 1.7-2 cm., Campos Alegre, Rio Jauru, June 2, 1909. 

 No. 2759, 2 cm., Sao Luiz de Caceres, Rio Paraguay, May 23, 1909. 



63. Heterogramma trifasciatum maciliense, var. nov. (Plate LXH, 



fig. 2.) 

 No. 275ia-(i, i. 3-3.1 cm., Sao Antonio de Guapore, July 9, 1909. 



