41 
most interesting contribution to our present knowledge of vibratory 
motion and the possibilities of electricity, the same writer remarks:* 
The discovery of a received sensitive to one set of wave lengths and silent to 
others is even now partially accomplished. The human eye is an instance supplied 
hy nature of one which responds to the narrow range of electro-magnetic impulses 
between the three ten-millionths of a millimeter and the eight ten-millionths of a 
millimeter. It is not improhahle that other sentient beings have organs of sense 
which do not respond to some or to any of the rays to which our eyes are sensitive, 
hut are able to appreciate other vibrations to which we are blind. Such beings 
would practically be living in a different world from our own. Imagine, for 
instance, what idea we should form of surrounding objects were we endowed with 
eyes not sensitive to the ordinary rajs of light, but sensitive to the vibrat.ons con- 
cerned in electric and magnetic phenomena. Glass and crystal would be among the 
most opaque of bodies. Metals would be more or less transparent, and a telegraph 
wire through the air would look like a long, narrow hole drilled through an imper- 
vious solid body. A dynamo in active work would resemble a conflagration, while 
a permanent magnet would realize the dreams of mediaeval mystics and become an 
everlasting lamp with no expenditure of energy or consumption of fuel. 
In some parts of the human brain may lurk an organ capable of transmitting and 
receiving other electrical rays of wave lengths hitherto undetected by instrumental 
means. These may be instrumental in transmitting thought from one brain to 
another. * * ■* 
A NEW SPECIES OF PEZOTETTIX. 
By Lawkexce Bruner, Lincoln, Xebr. 
Among the locusts found most abundantly in the valley and hill- 
sides about Grand Junction, Colo., while on a trip to that region during 
the month of June, 1893, was an undescribed species of the genus 
Pezotettix. This locust bears some resemblance to Melanoplus turn- 
bull i Thos., but unlike that species has very short and rounded 
tegmina. It resembles that species also in its food habits, seeming to 
confine its attention almost entirely to the various species of plants of 
the botanical family Chenopodiacew, which abound in the regions where 
it occurs, being particularly fond of the grease- wood {Sarcobatts ver- 
micular is). 
In my annual report as special agent of the Division of Entomology, 
published in Bulletin No. 32 of the Division, I have mentioned this 
insect as Pezotettir chenopodii. The following description is given: 
Pezotettix chenopodii n. sp. 
A compact, short-limbed species related to and having the general appearance of 
the CaJoptenus tumbulli of Thomas. General color testaceous olive-gray with mark- 
ings of dark brown upon occiput, disk and sides of pronotum, sides of basal segment 
of abdomen and hind femora; the dark dorsal line of pronotum with a narrow paler 
one along its middle, as in the various species of Hesperoiettis. Hind tibiae varying 
from pink to pale glaucous, usually the latter, with pale annulus near base. 
Head moderately large, eyes large but not prominent, separated above by the 
slightly Silicate depressed vertex, which is nearly as wide as the frontal costa; 
* Some Possibilities of Electricity. — Fortnightly Keview, March, lsi»2. 
