62 



BULLETIN 36, UNITED STATES NATIONAL MUSEUM. 



Prodel|jhinu8 doiis (Gray). 



plagiodon (Cope), 

 uormulis (Gray). 

 breviiuanus (Wagnor). 

 fniMiatu.s (F. Cuvior). 

 frontalis (Diissiiinier). 

 attenuatus (Gray), 

 capeusis (Gray). 



Prodelphiuus i>unctatus (Gray). 



malayanus (Schlegel). 

 psemlodelpliib (Wagner), 

 longirostris (Gray), 

 btenorhynchus (Gray), 

 microps (Gray), 

 alopo (Gray). 



Several otUer species were assigned to this genus by Professor 

 Flower which seem to me to belong elsewhere. Of these C. obscura 

 Gray, C. siinilis Gray, ami Electra tJiicolea Gray, seem to me to belong 

 to LagenorhijiicUwi ; JJelphiitus roselKontris, Hombron and Pacheran, I 

 prefer to leave in the genus to which it was originally assigned; D. 

 fiuperciliosa, Lesson and Gariiot, is not sufficiently well defined to admit 

 of an opinion. 



PRODELPHINUS C(ERULEO-ALBUS (Meyen). 



Deljihinus carulco-albus, MeycMi, Nova Acta Nat. Curios., xvi, pt. 2, 18315, pp. 609, 

 610, pi. 43, lig. 2; \Vagner, Sclireber's SiliigetL., 7th Th., 1846, p. 336, pi. 363; 

 Gray, Zool. Erebus aud Terror, 1846, p. 42. 



Lagenorht/nchus cicntlea-alhits, Gray, Catalogue of Cetacea, 1st ed., 18.j0, pp. 100, 

 101; 2d ed., 1866, pp., 268, 269. 



This species is based on a speoimen obtained by Meyen on the east 

 coast of South America, in the vicinity of the Rio de la Plata, and de- 

 posited in the Zoological Museum of Berlin. 



The skull, which I was enabled to examine in 1887 through the kind- 

 ness of Dr. Ililgendorf, resembles that of P. euphrosijnc, and also in 

 some respects that of P. dons. It is peculiar in having very small oval 

 temporal fosste, which ore directed upwards strongly beliind. The 

 intermaxilhe are much arclied in the middle of the rostrum, and the 

 pterygoids are strongly carinate. Jn the skeleton 1 counted 7 cervical 

 vertebrte, 14 dorsal vertebra, and oU lumbars and caudals, but a few 

 more should probably be added to the number of tlie latter. The trans- 

 verse processes of the lumbar vertebne are slender and are directed 

 forwards. 



The color of the species, as indicated in Meyen's figure and descrip- 

 tion, is apparently quite dififerent from that of any other known species, 

 (See Synopsis^ p. 1G3.) 



Why this species was included by Gray in the genus Laf/eiiorJnjnchm 

 is not clear, since the form of the skull and beak are characteristic of 

 Prodelphinus. Cassin's reasons for associating with this species the 

 Delphinns albirostratus of Peale are equally unsatisfactory.* I have; 

 been unable to identify the latter species. 



*Cassin, U. S. Explor, Exped., Mamiualogy arid Ori^ithotogy, 2d ed., 1858, p. 31 i 

 Atlas, pi. 6, tig. 2. 



