FISHES OF WEST COAST OF PEEU. 117 



Regarding the fishes taken at Pacasmayo, Doctor Coker writes: 

 '' These specimens were taken in a small, dirty stream flowing 

 through the village of Pacasmayo, and conveying to the ocean the 

 surplus water from drainage ditches fed from the Jequetepeque 

 Eiver. Beginning at the bay I worked up for about half a mile 

 meeting the different kinds in the following order: 'Licitas' (young 

 Mugil cephMus) \ 'AncliO'' {Astyanax peruanus) ] 'Chorocoque' 

 {Lehiasina himaculata) ; 'Cameron' (shrimp) ; 'Sarra' {Aequidens 

 rivulatus) ; 'Liza' (large Mugil cephalus). Taking fish as I came 

 down, this order was exactly reversed." 



Family POMACENTEIDAE. 



THE DEMOISELLES. 



KEY TO GENERA. 



a\ Teeth conical, or villiform, not compressed Chromis, p. 117. 



a^ Teeth not conical or villiform, somewhat compressed; preopercle entire in 

 adult. 



&'. Suborbitals entirely adnate to the cheeks Nexilosus, p. 121. 



6^ Suborbitals not adnate to the cheeks AMcdefdicf, p. 123. 



Genus CHROMIS Cuvier. 



KEY TO SPECIES. 



a\ Dorsal spines 13 crusvia, p. 118. 



a^ Dorsal spines 12. 



6\ Caudal fin uniform in coloration intercrusnia, p. 119. 



&^ Caudal fin with a broad black border on each lobe, narrowly margined 

 with lighter, central part of fin light atrilobatus,'p. 111. 



145. CHROMIS ATRILOBATUS Gill. 



Chromis iFurcaria) atrilobata Gill, Proc. Acad. Nat. Sci. Phila., 1862, 

 p. 149 ; Cape San Lucas. 



Chromis atrilobatus Jordan and Evermann, Fishes North and Mid. Amer., 

 vol. 2, 1898. p. 1546. — Gilbert and Stakks, Fishes of Panama Bay, 

 Mem. California Acad. Sci., vol. 4, 1904, p. 139, pi. 21, fig. 43. 



One specimen, field No. 09178, 11 cm. in length, and three speci- 

 mens, field No. 09440, 5.7 to 7.5 cm. in length, from Lobos de Afuera. 



Head 3.36 in length; depth 2.62; eye 3.57 in head; snout 3.84; 

 maxillary 2.77; D. XII, 13; A. II, 10 (normally there are 11 or 

 12 rays in the anal) ; scales 3-28-9, 20 pores. 



Body slender, greatest depth at origin of dorsal; a slight depres- 

 sion over eye in longitudinal contour ; top of head everywhere trans- 

 versely convex; preopercle oblique, sometimes slightly emarginate in 

 its lower half, mouth small, oblique; teeth in bands in each jaw, those 

 in the outer row large, conical, curved; spinous dorsal low, of uni- 

 form height ; soft dorsal and anal angulated ; caudal lobes long, pro- 

 40656°— Bull. 95—17 9 



