Roosevelt Wild Life Bulletin 367 



PAGE 

 Figure no. An antelope that has recently shed his horns. The horn eores 

 and new sheaths, their basal half covered with fine hair, as they 



appear in November. Photo by Edmund Heller, 1921 462 



Figure III. A buck antelope which has shed its horns, showing the cores 

 over which the new pronged sheath develops. Beyond him 

 stands a doe with characteristic tiny horns. Photo by 



Edmund Heller, 192 1 465 



Figure 1 12. The archway at the northern entrance to Yellowstone Park, dedi- 

 cated by President Roosevelt in 1903. The boundary fence 

 across the Gardiner River flats at this point helps to hold the 

 antelope (but not the elk and deer), from migrating down the 

 valley to their natural winter range, where they would be 

 slaughtered by Montana hunters. Photo by Edmund Heller, 



1921 465 



Figure 1 13. View down the rapids of the Yellowstone River at the entrance to 

 the lower part o"^ the Grand Canyon, below Tower Fall, show- 

 ing the " palisades " and the rock columns known as " the^ 

 needles." Photo by Edward R. Warren, July 16, 1923. .... 470 

 Figure 114 (Field No. 5561). Stone-fly nymphs from the Yellowstone 



River near Yellowstone River Bridge. 475 



Figure 115 (5520). A stone-fly nymph (Pteronarcys californica) which has 

 just come out of the water and is crawling up a rock to a 

 sheltered spot for transformation to the adult insect. Photo 



July 25, 1921 475 



Figure 116 (5519). Salmon colored stone-flies {Pteronarcys californica) 

 " emerging " from the larval skins. In the upper specimen the 

 larval skin has just split ; in the lower one the head and legs are 



free. Photo July 25, 192 1 476 



Figure 117 (5506). Stone-flies "emerging" on a rock near Yellowstone 

 River Bridge. Some of the dried cast larval skins are sticking 



to the rock. Photo July 6, 192 1 476 



Figure 118 (5585). Tower Creek, looking down the gorge; from junction of 

 Carnelian Creek (right) and Tower Creek (left). Photo Sept. 



6, 1921 ■ 479 



Figure 119 (5548). Rapids just above Yellowstone River Bridge, on Cooke 

 City road. Detail of foreground shows lesser rapids and 

 pockets which form the feeding grounds of young fish. Photo 



Aug. 15, 1921 479 



Figure 120 (5508). Stone-flies in characteristic clusters, often as many as 

 twenty individuals, in crevices of rocks along the lower Lamar 

 River. (See also figure 131 for general habitat.) Photo July 



6, 1921 480 



Figure 121 (5507). Stone-flies mating on shore grass along the Yellowstone 



River. Photo July 6, 192 1 480 



Figure 122 (5550). One of the hot sulphur springs along the Yellowstone 

 River. This particular spring lies at the base of a hollowed 



rock shown in upper middle of figure 119 483 



Figure 123. May-fly nymphs from the Lamar River; four times actual size. 



Middle specimen turned over to show the " sucker " on under 



side, by means of which this particular species clings to rocks. 483 



Figure 124. An adult may-fly with a parasitic worm emerging from the caudal 



end. Enlarged eight times. Note the loop formed by the 



parasite within the abdomen of the host 484 



Figure 125 (5525). An association of caddis-worms in their cases, attached to 



a wet rock. Pour types of cases are shown on this overturned 



rock on the margin of Lost Creek. Photo July 27, 192 1 ..... 484 



Figure 126 (5524). " Picket " caddis-worms in their square cases, showing 



characteristic position and attachment. On wet boulders 



along the Lamar River. Photo July 25, 192 1 487 



Figure 127 (5531). Caddis-worms along the Lamar River, left stranded by 

 recession of the stream. Two types are here shown, — • 

 " picket " caddis-worms {Limnephilus) and " barnacle " 

 caddis-worms. Photo Aug. 8, 1921 4^7 



