1132 The American Naturaist. [December, 
tacea and the cheliceres of the Arachnids are homologous with the 
antennz of the Hexapods. The editor of the NATURALIST has reasons 
for believing that as soon as we know anything about the embry- 
ology of the Thysanures, many points in Hexapod morphology and 
in the relationships of the various Arthropod groups will receive a 
flood of light. 
_Cottus beldingii, sp. nov.2—In October, 1889, Mr. L. Belding 
obtained three specimens of a species of Cottus in Lake Tahoe, Cali- 
fornia. During June, 1890, we obtained a much larger number at 
the same place. A series of these was sent to the British Museum. 
The rest are in the collections of the California Academy of Sciences, 
No. 504. Mr. Belding’s specimens are also in the collections of the 
Academy, No. 702. We also obtained a number from Donner Lake, 
California, No. 505, California Academy of Sciences. 
ese specimens represent a variety or species distinct from the 
Alaskan Cottus minutus,* with which it is most closely related. 
Head 234-4; depth 4-5; D. VI—VIII. 1514-18; A.11-13; V.1.4. 
Head rather short and broad, the profile convex, more steep from 
eye forward ; eye large, orbit 4-5 in head; interorbital concave, 2 
in orbit; mouth large; maxillary reaching at least to below the pupil, 
about 2 in the head, Preopercle with a simple, backward-directed 
spine, very slightly curved upwards. Teeth on jaws and vomer, none 
on palatines. Skin smooth, Pectorals reaching vent, or further in 
young; ventrals 1%4-2 in head. Distance of anal from caudal 1% in 
its distance from snout. Anus nearer insertion of caudal than to end 
of snout. Mottled with black and white. About six blackish cross- 
bars on back ; the first across head just behind eyes, next at origin of 
dorsal. First dorsal tinged with rust, the second less so, All the fins 
except the ventrals spotted with dark. The ground color varies 
greatly with the bottom over which these fishes live. 
The other species found at Lake Tahoe were Phoxinus montanus 
Cope, Agosia oscula Girard, Algansea obesa Girard, Coregonus william- 
soni Girard, Catostomus tahoensis Gill and Jordan; Sa/mo mykiss 
henshawi Gill and Jordan. Besides these we obtained A/gansea olivacea 
Cope, from Donner Lake.—C. H. anp R. S. EIGENMANN. 
3 We have lately examined series of specimens belonging to the Academy of Sciences 
which makes it quite certain that Cottus gulosus Girard is identical with Cottus asper 
Richardson. 
t Dr. Jordan tells us the name Co¢tus minutus is preoccupied, and not available for 
the Alaskan species. 




