514 PROCEEDINGS OF THE ACADEMY OF ' [July, 



area over the caudal spot. Anterior dorsal rays with a black spot 

 near their tip. A yellowish humeral spot. 



The anal in the co-types reaches 24 rays; Lat. 1., 34-37; depth 2|-3. 



The specimens from the brook (255 in part) are very slender, depth 3j 

 and 3f in the length. The dark markings are intense. The first 

 developed dorsal ray of one is prolonged in a filament which reaches 

 the adipose. 

 67. Cheirodon interruptus (Jenyos). 



a. Ten specimens (No. 266), 28-42 mm., from Campo Grande, June, 



1901, show the following characters: 



Min. Max. Average. 



Length inmm 25.0 42.0 31.6 



Anal rays '. 22.0 27.0 



Depth 2.5 2.8 



Head 3.6 4.0 



Eye 2.6 3.0 



Teeth in maxillary 1 



Perforated scales 6 8 6.56 



Scales 5.5 to 6-31 to 32-4 to 5. 



b. Thirteen specimens (part of No. 251), 25-40 mm., from a brook 

 near Arroyo Trementina show the following characters : 



Min. Max. Average. 



Length in mm ■ 18.5 34.0 27.81 



Analrays 21 23 



Depth 2.4 3.2 



Head 3.0 4.2 



Eye 2.2 3 



Teeth in maxillary 



Perforated scales 5 11 



Scales 5 to 7-30 to 36-4^ to 6. 



The specimens mentioned above, compared with the description 

 of interruptus, give the following results : 



Specimens . Descriptions . 



Anal 20-27. Anal 19-20. 



Scales 30-36?::-^. Scales 35|. 



Depth 2|-3yV- Depth 2h. 



Head 3-4i. Head 4. 



Dorsal 10-11. Dorsal 11. 



Pectorals fall short of, reach to 

 or slightly overlap ventrals. 



A large, black caudal spot. 



A dusky band from tail to be- 

 low dorsal. 



Pectorals extend beyond root 

 of ventrals. • 



A black spot at the base of the 

 caudal. 



Sides with a bright longitudinal 

 band. 



