On Fishes from Mexico and British Honduras. 255 



a small area of tumbled rock, a few acres in extent," and 

 Mr. Robert informs me that T. laurentius is similarly very 

 local in its distribution. He never met with it in any of the 

 other places where he has collected. 



Thrichomys laurentius has four mamma?, one pair placed 

 high up on the flank behind the axiliae, and a second pair 

 4-5 cm. further back in front of the hips. No doubt the 

 other species are similar in this respect. 



T. laurentius is most nearly allied to T.apereoides, but may 

 be distinguished by its darker colour and less bushy and 

 crested tail. T. Fosteri, with a tail like that of T. apereoides, 

 has a rather more greyish belly, wider palatal foramina, and 

 more complicated third molars. 



XXX. — Descriptions of new or litth-knoion. Fishes from 

 Mexico and British Honduras. By 0. Tate R,EGAN, B.A. 



Clupea (Opisthonema) Bulleri, sp. n. 



Depth of body 31-3f times in the total length, length of 

 head 4 times. Snout as long as or a little longer than eye, 

 the diameter of which is 4 times in the length of head. 

 Maxillary extending to below anterior ^ of eye ; lower jaw 

 projecting. Sc. 48-50/16. 1). 17. A. 20-21. Last dorsal 

 ray elongate. Origin of dorsal in advance of ventral, a 

 little behind the vertical from the tip of pectoral. Pectoral 

 | the length of head, extending back a little more than § the 

 distance from its base to the anal. Silvery below, darker 

 above ; a more or less distinct dark spot on the shoulder ; 

 dorsal and caudal dusky. 



Total length 127 mm. 



Two specimens from Las Peiias, Jalisco, Mexico, collected 

 by Dr. Buller. 



This species is closely allied to C. thrissa, Brouss., but is 

 distinguished by the smaller eye, lower jaw somewhat pro- 

 jecting, and no rows of dark spots on the upper part of the 

 body. 



Engraulis (Stolephorus) argentivittatus, sp. n. 



Depth of body about 6 times in the total length, length of 

 head 3§ times. Snout nearly as long as eye, the diameter of 

 which is 4tL-4£ times in the length of head. Maxillary ex- 

 tending about to posterior edge of praeoperculum, D. 12-13, 



