554 Bulletin 47, United States National Museum. 



257. MACROSTOMA,* Riseo. 



Macrostoma, Risso, Europe Merid., HI, 447, 1826, (angustidens) ; not Macrostomus, WIED, 1817, a 



genus of insects. 



Noloscopelus, GUNTHER, Cat., v, 405, 411, 1884, (resplendent). 

 Catablemella, EIOENMANN & EIGENMANN, Proc. Cal. Ac. Sci., 2d series, in, 1890, 24, (brachychir). 



Myctophids with the dorsal fin much longer than the anal, and overlap- 

 ping the anterior half of the latter. Body elongate. Snout obtusely con- 

 ical ; jaws equal in front ; cleft of mouth nearly horizontal ; maxillary 

 not dilated behind. No luminous glands on head or tail. Arrangement 

 of photophores irregular. Precaudals 2 + 1 or 2, the last one high up. 

 oc, large ; crr6//a, mouth.) 



a. Mediolaterals 3, in a curved, Bubvertical series; posterolaterals 2 or 3. 

 b. Posterolaterals 2, horizontally side by side, under adipose dorsal. 



c. Caudal spots 3 (2 + 1); posterolaterals under soft dorsal; pectoral weak and short. 



d. Dorsal rays 21 ; anal 20; scales 42; anal photophores 8 + 8. QUERCINUM, 828. 



dd. Dorsal rays 16; anal 14; anal photophores 9 -f 17. MARGARITIFERUM, 829. 



cc. Caudal spots 4 (2 + 2); first posterolateral under adipose dorsal, second behind it. 



D. 21 to 24; A. 17 or 18; anal series 8 or 7 + 6 or 7. ANGUSTIDENS, 830. 



bb. Posterolaterals 3, horizontally side by side; caudal spots 3 (2 + 1); last posterolateral 



under adipose dorsal; pectoral short and weak. D. 20 or 21; A. 16; scales 46; anal 



series 9 + 4. CASTANEUM, 831. 



aa. Mediolaterals 2; posterolateral 1; caudal spots 3, the last at end of lateral line. D. 20; A. 



18; scales 36. CAUDISPINOSUM, 832. 



828. MACROSTOMA 'QUERCINUM (Goode & Bean). 



Head 3 to 4; depth 5f. D. 21 or 24; A. 19 or 20; scales 42. Eye 

 moderate, nearly 4. Snout short, about i as long as the diameter of the 

 eye. Mouth oblique and very large, the maxillary extending to angle 

 of preoperculum. Length of upper jaw about that of head. Origin 

 of dorsal much nearer tip of snout than root of caudal, being over the 

 twelfth scale of the lateral line and immediately above origin of ventral ; 

 length of its base equal to that of head, and longest ray as long as head, 

 its end over seventh ray of anal; pectoral short, not reaching to origin 

 of ventral; anal origin about under twenty-first scale of lateral line, 

 the length of the base equals that of head without snout, and the longest 

 ray is about i as long as head ; adipose fin very slender, its distance 

 from end of dorsal equaling i length of head; caudal moderate, deeply 

 forked. A large luminous spot near the angle of the preoperculum ; 2 

 above the pectoral base and 1 below it ; 1 just below the lateral line 

 above the origin of the anal ; 5 or 6 between the isthmus and the root of 

 the ventral ; a number of others not accurately counted. Color dark 

 brown. 



Mediolaterals 3, in curved sub vertical line; posterolaterals 2, under the 

 soft dorsal; precaudals 2 -f- 1, the last below the end of the lateral line? 

 one of the precaudals very high up. Western Atlantic, at 700 to 800 

 fathoms ; also in the Mediterranean. (Goode & Bean. ) This is very likely 



* By the rules of the Amer. Ornithol. Union, Noloscopelus should be used instead of Macrostoma, 

 as there is a prior genua Macrostomus. We regard the two as distinct, as they are spelled differ- 

 ently. 



