1887.] PEOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 373 



scales. The first dorsal ray is slender, articulated, and somewhat more 

 than one-half as long as the second, which is about three-fourths as 

 long as the third. The longest ray of the dorsalis two-thirds as long as 

 'the head. The base of the dorsal is one-sixth as long as the total with- 

 out caudal. The anal is inserted under the fifth ray of the dorsal. 

 Several of the anterior rays of the anal are modified, being shorter than 

 the rest and crowded together. The longest anal ray is nearly one-half 

 as long as the head. 



The pectoral Is inserted considerably below the middle of the depth 

 of the body, its upper edge being on a level with the lower margin of 

 the orbit ; its length is one-fifth of the total without the caudal. 



The caudal is imperfect, and its exact shape cannot be determined. 



The length of the head is contained 3J times in the total, without 

 caudal, and is less than the greatest depth of the body. The length 

 of the caudal peduncle equals that of the head without the snout; the 

 least height of the caudal peduncle equals one-half the length of the 

 head. 



The ventral is inserted at about the middle of the total length with- 

 out th(i caudal and it reaches to the vent; its length is about two-fifths 

 of the length of the head. 



D. 13; A. 15-10; scales 14-35. 



Coloration in spirits. — The male is chestnut brown, with an indis- 

 tinct dark lateral stripe made up of a series of interrupted dark blotches. 

 Opercle silvery ; abdomen yellowish. 



The female is without the lateral stripe, the whole side being covered 

 with irregular brown blotches. The opercle is silvery and the belly 

 yellowish. 



Funduliis dugesii, n. sp. (PL XX, f. 5). 



The types of the following description are two females (No. 37831), 

 one of which is 60™"' and the other 64:™™ in length. Besides these large 

 females there are numerous additional examples of both sexes, the 

 smallest being a male 37™™ in length. The total number of examples 

 of this species is eleven. The exact locality is not known ; they were 

 sent with other species from Guanajuato, Mexico, by Prof. A. Duges. 



This new species of Fiindulus differs greatly from all the other species 

 known from the vicinity in having a very short anal base. In Fundulus 

 labialis, punctatus, gtiate^nalensis, and pachycephalus the bases of the 

 dorsal and anal fins are nearly equal in length, but in this species the 

 anal base is one-half as long as the dorsal base. The species about to 

 be described resembles F. guatemalensis and F. pacliycephalus in the 

 shape of the body. The largest example, however, has a more decided 

 elevation at the nape than any of the others. The head is moderately 

 broad with the interorbital space depressed and flat, and its length is 

 nearly one-third of the total without the caudal, and is about equal to 

 the height of the body. In the smaller of the typical specimens the 

 nape is scarcely arched. The snout is short, shorter than the eye, and 



