536 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 
152. KYPHOSUS LUTESCENS. 
Pimelepterus lutescens Jordan, Proc. U.S. N.M. 1881, 229 (Braithwaite Bay, Socorro 
Island); Jordan, Bull. U. 8. F.C. 1881, 328. 
Kyphosus lutescens Jordan, Proc, U. 8. N. M. 1885, 380 (Socorro Island, no description). 
Habitat: Revillagigedo Archipelago. 
Etymology: Lutescens, growing yellow. 
This species is known only from the original type taken on Socorro 
Island and from another taken at Clarion Island by Dr. Gilbert. 
153. KYPHOSUS OCYURUS. 
Pimelepterus ocyurus Jordan, Bull. U. 8. F.C. 1881, 327, 328 (Bay of Panama); Jordan 
& Gilbert, Bull. U.S. F. C. 1882, 110 (Panama, no description). 
Kyphosus ocyurus Jordan, Proc. U.S. N. M. 1885, 380 (Panama, no description). 
Habitat: Panama. 
Etymology: @zb<, quick; odpd, tail. 
This species is known only from the original types, from Panama 
It is a strongly marked species, perhaps the type of a distinet sub- 
genus or even genus, Sectator, characterized by the little development 
of the roots of the teeth and by the deeply forked caudal. 
XLIV. MEDIALUNA.* 
Medialuna Jordan & Fesler, gen. nov. (californiensis). 
Type: Scorpis californiensis Steindachner. 
Etymology: Spanish medialuna—half moon, the vernacular name of 
the typical species in California. 
This genus contains a single species which belongs to the Californian 
fauna. Its nearest relative seems to be the Australian genus Atypich- 
thys Giinther, which has a different fin formula (D. XI, 15; A, 11, 15) 
and the middle dorsal spines much longer, about half of head. The 
two genera are apparently distinct; certainly neither belongs to the 
Chetodontide. 
*The genera lately subtracted from Scorpis (type S. georgianus, an Australian 
species) may be defined as follows: : 
a. Anal fin long, 24 in length of body, its rays, ILI, 25 to 27; dorsal spines gradually increasing in 
height posteriorly (teeth said to be conical, but probably compressed). 
b. Soft dorsal and anal faleate. the longest ray 14 in base of rayed part; dorsal spines 9.--.-. SCORPIS. 
bb. Soft dorsal and anal not falcate, the longest ray 2% in base of rayed part; dorsal spines 10. 
CSIOSOMA (Kaup). 
aa. Anal fin short, its base 33 in length of body, its rfys III, 19; dorsal spines gradually increasing 
in height to the sixth, decreasing posteriorly; soft dorsal and anal not falcate, the longest ray 
14 in base of rayed part; preoperculum serrated at angle; teeth compressed, incisor-like, but 
NATTOW «cckunscesievscsc Selsiasivssoceecnbewes Joueneccneueenis clase sinme=|s omswinaicie als uum =r winile MEDIALUNA. 
