1854.] 85 



lateribus fere parallelis, elytris thorace fere duplolatioribus ; tibiis apice tarsis- 

 que nigris, palpis, labro, clypeo, antennisque luteo-testaceis, his extrorsum ob- 

 scuri6. Long. *85 95. 



Laredo to Ringgold Barracks, Mr. Weise. In the male, the first joint of the 

 antennae is as long as the head, compressed, and angulated externally beyond the 

 middle but very slightly curved : the second joint is one half larger than the 

 third. In the female the first joint extends to the posterior margin of the eye, 

 and the second joint is about equal to the third. This species is allied to L. longi- 

 collis Lee. but the color of the cephalic organs, and the sexual characters distin- 

 guish it at first sight. 



Zonitis rufa, pallide rufa, breviter pubescens, capite modice, thorace parcius 

 punctato, hoc latitudine fere longiore, nitido subcanaliculato, lateribus antice ro- 

 tundatis, elytris dense rugose punctatis, pedibus ore antennisque nigris. 

 Long. -27. 



One specimen, Frontera, (Rio Grande) Mr. Clark. This species has very 

 much the appearance of a small Nemognatha, but the maxillae are not elongated: 

 the spurs of the posterior tibiae are broad, the outer one obtuse, the inner one 

 subacute. The second joint of the antennae is two-thirds as large as the third. 



Tanymecus lautus, niger, parcius cinereo-squamulosus, capite punctato 

 canaliculato, thorace latitudine sesqui breviore, lateribus parallelis apice rotun- 

 datis, parcius grosse punctato, disco subcanaliculato, postice fovea lata excavato, 

 elytris thorace latioribus humeris obtuse angulatis, apice valde declivi, punctis 

 seriatis maiusculis impressis, interstitiis alutaceis. Long. -46. 



One specimen, Frontera, (Rio Grande) Mr. Clark. The largest species I have 

 seen within our Territories. 



Notice of a new species of Salmo??idcB, from the north-eastern part of the 



United States. 



By Charles Gieard. 



The body of the male is subfusiform and rather slender, particularly the caudal 

 region ; the head being regularly subconical and contained five times in the total 

 length. The maxillaries are gently curved, extending backwards to about the 

 posterior margin of the orbit. The female is stouter, with the peduncle of the tail 

 shorter ; the head has the same general shape, but is not contained five times in 

 the total length. The maxillaries are less curved, but extend as far backwards 

 as in the male. The eye is very large ; its diameter being contained nearly five 

 times in the length of side of head. The caudal is deeply emarginated posteriorly, 

 giving to it a more forked appearance than in either Salmo oquassa or Salmo 

 sebago. The adipose fin, in the male, is situated opposite the anterior margin of 

 the anal, whilst in the female it corresponds to the posterior margin of the same 

 fin. 



The scales are well developed, being somewhat smaller, however, than in 

 Salmo sebago, and considerably larger than in either Salmo oquassa or Salmo 

 erythrogaster. On the dorsal and ventral regions they are considerably smaller 

 than upon the sides and along the peduncle of the tail. They extend, diminish- 

 ing in size, over nearly the half of the length of the middle rays of the caudal fin. 

 The lateral line takes an almost straight course along the middle region of the 

 flanks. The following is an approximate formula of the rays of the fins: 



D 3. 12. A 1. 9. C 8. I. 8. 9. I. 5. V 1. 9. P 14. 



There are two anterior rudimentary rays to the dorsal, one or two to the anal, 

 one to the ventrals, eight or ten to the upper lobe of the caudal, and five or six 

 to the inferior lobe. 



The uppnr surface of head and dorsal region are blackish brown; the sides are 

 silvery white, and the belly yellowish. The region above the lateral line is 

 densely spread all over with black irregular spots, some of which are confluent; 

 a few scattered ones may be seen beneath that line upon the middle of the abdo- 

 men. Four to six of these spots, w r ell defined, are always observed on the oper- 



8 



