286 CHEOMIDES. 



bands. The specimens from Guatemala have a large black blotch on 

 the middle of the root of the caudal. Fins dark-brown in adult 

 specimens, lighter in young ones and with a few scattered dark dots. 



2. Heros fenestratus. 

 Chromis fenestrata, Giinth. Froc. Zool. Soc. 1860, p. 318. 



D. (J^, A. <-^. L. lat. 33. L. transv. 6/13. Vert. 14/15. 



The fold of the lower Kp is interrupted in the middle ; five series 

 of scales on the cheek. The height of the body is one-half, or rather 

 less than one-half, of the total length (without caudal). A black 

 band fi-om above the pectoral to the root of the caudal. 



Mexico. 



a-b. Types of the species. Rio de la Lana. From M. SaUe's Col- 

 lection. 

 c-d. Fine specimens. Mexico. From M. SaUe's Collection. 

 e. Fine specimen. Mexico. Purchased of Mr. Cuming. 

 /. Adult : skeleton. Mexico. Purchased of Mr. Cuming. 



Description. — The height of the body is one-half, or rather less 

 than one-half, of the total length (without caudal), the length of the 

 head one-third. Head as high as long ; snout of moderate extent, 

 slightly elevated, the prteorbital being somewhat wider than the 

 orbit. Cleft of the mouth small, horizontal, Tvith the jaws equal 

 anteriorly. The eye is situated below the upper profile, nearer to 

 the extremity of the snout than to that of the operculimi. Inter- 

 orbital space convex, wider than the orbit. Vertical fins very slightly 

 scaly at the base ; dorsal spines moderately strong, the length of the 

 twelfth being two-fifths of that of the head ; the soft dorsal and anal 

 are pointed, their points not extending to the middle of the caudal. 

 Caudal rounded. The distance between the dorsal and caudal is less 

 than the greatest depth of the free portion of the tail. Pectoral 

 shorter than the head ; ventral pointed. 



Brownish-green, with six dark cross-bands, less distinct in old 

 individuals than in yoimg ones, crossing a deep-black longitudinal 

 band which runs from above the pectoral to the middle of the root 

 of the caudal. Vertical and ventral fins blackish, darkest at the 

 base and margins. 



Length of the largest specimen 6 inches. 



The skeleton of Heros scarcely differs from that of Acara. Twice, 

 in our skeleton of the present species, the centra of two vertebra? ai'e 

 confluent into one, whilst the apophyses remain separate. 



3. Heros temporalis. 



D. IZ. K.^. L. lat. 31. L. transv. if. 



The fold of the lower lip interrupted in the middle ; five series of 

 scales on the cheek. The height of the body is one-half of the total 



