Nerve-winged Insects; Scorpion-flies; Caddis-flies 239 
and snatched at the second. Then holding both, it began to suck the blood 
of the fresher prey. 
Bringing some scorpion-flies into the laboratory, Miss Patterson placed 
a crane-fly in the jar with a pair of them. The male scorpion-fly seemed 
unusually hungry and soon caught its prey and began to eat. The female 
paid no attention until the male had eaten for some time. Then Miss Pat¬ 
terson observed the male to bend the posterior portion of its abdomen, and 
between the sixth and seventh and seventh and eighth segments on the 
norsal side of the body rounded organs were quickly protruded and with¬ 
drawn. Shortly after this the female approached and also began to eat 
the crane-fly. Several times she noted the males attracting the females by 
protruding the “ scent-glands.” In every case, when the male began to give 
off the scent, the female gradually approached. 
Eggs were laid by the females in the laboratory jars. These eggs were 
pink in color and spherical, although slightly flattened at opposite sides. 
They are simply dropped by the female loosely and singly to the ground. 
In the Rocky Mountains of northern Colorado are some of the most 
attractive “camping-out” places in our land; that is, for “campers” who 
specially like Nature in her larger, more impressive phases. The peaks 
of the Front Range rise to 14,000 feet altitude, and the ice- and water-worn 
canons and great sheer cliffs of the flanks of the Range are only equalled 
Fig. 329 .—Phryganea cinerea. (After Needham; enlarged.) 
in this country by the similar ones of the Californian Sierra Nevada. The 
mountain-climber in these wild regions cannot but interest himself in the 
animal and plant life which he finds struggling bravely for foothold in even 
the roughest and most exposed places. To the entomologist the few 
hardy butterfly kinds of the mountain-top, the scarce inhabitants of the 
