246 PROCEEDINGS OF THE ACADEMY OP 



The second and third dorsal spines are nearly equal, angulated at the ter- 

 minal third (normally ?) contained rather more than seven times ( - 13 13}) in 

 the total length, and nearly twice as long as the last one (*07.) The third 

 anal spine is larger than the second, shorter than the last dorsal one and a 

 quarter ( - 06) of the head's length. The caudal forms between a third and 

 fourth ( - 29) of the length, equals the pectorals, and is twice as long as the cen- 

 trals . 



116 



D. IX. 9-. A. III. 7-. Scales 44. 

 1 1 13 



The color is silvery with steel blue reflections above ; the fins immacu- 

 late. 



DlAPTERUS GRACILIS Gill. 



The greatest height scarcely equals a quarter (*23) of the extreme length ; 

 the caudal peduncle is robust and regularly attenuated to the base of its fin. 

 The head forms between a fourth and fifth ("22) of the length ; the diameter 

 of the orbit enters nearly three times (7-22) in length of the head, exceeds 

 the length of the snout ("06) and equals the interorbital area. The maxillary 

 groove is linear, naked, and extends beyond the vertical from the anterior 

 third of the pupil. The exposed surface of each maxillary bone is long, 

 oblique and uniformly wide to its anterior third, whence the upper margin 

 is bent forwards. The posterior half of the lateral line is rectilinear and par- 

 allel with the dorsal outline. 



The second and third dorsal spines are slender, nearly straight, contained 

 eight or nine times ('12, '11) in the total length, and almost four times longer 

 than the last spine (=*U4), The third anal spine is longer than the second, and 

 equals about a third of the head's length, (-06, -06.) The caudal fin forms 

 more than a fifth ( - 22) of the length, equals the pectoral, and is nearly twice 

 as long as the ventrals (=*12.) 



1 1 5 



D. IX. 9 -. A. III. 7 -. Scales 45 . 

 1 1 10 



The color is silvery, and on the back tinged with purplish and with a steel 

 blue reflection. The margin of the spinous dorsal, especially at its angle, is 

 black. 



This species is allied to Diapterus a p r i o n ( Gerres aprion C. et V.) D. 

 macrosoma (G. macrosoma Blkr., ) D. argyreus (G. argyreus C. et V., ) 

 and D. oblongus (G. oblongus C. et V., but is distinguished by the combi- 

 nation of characters indicated in the diagnosis. 



Descriptions of two new species of VESPERTILIONIDE, and some remarks or 



the genus ANTR0Z0US. 



BY HARRISON ALLEN, M. D. 



I have been permitted, by the Smithsonian Institution, to publish the fol- 

 lowing descriptions from specimens in its collection. 



Lasiukus intermedius, nob. 



Head large, flat and hairy. Snout high, emarginate and of a brown color. 

 Nostrils opening sublaterally. Sides of face moderately inflated. Mouth and 

 lower jaw fringed with short hair. There is a small naked space at mentum. 

 The ears are high, elliptical, pointed and nearly naked ; they are strongly 

 convex on their inner border, nearly straight on their outer ; the lobe at the 

 base of the outer border is very well developed. The tragus is similar in 

 shape to that of L. cinereus, but has a blunter incurved tip ; it is slightly haired 

 on facial surface. Eyes diminutive, placed near the ear. Thumb rather small. 

 Feet moderate. 



[April., 



