PHYSIOLOGICAL ANIMAL GEOGRAPHY 579 
In eastern Tennessee I found them in bare spots on the steep 
mountain slopes where steepness of slope had prevented the 
accumulation of leaves, and in parts of the forest that had been 
fired recently and the leaves accordingly removed. They occur 
in clays resulting from the weathering of the following rocks: 
Briceville shale, Newman limestone, Knox dolom te, Chicamauga 
limestone, and Conasauga shale. Near.Chicago they have been 
found on clay till, and on sandy till mixed with humus. 
4. Experimental studies of habitat selection. a. Method. This 
species has been placed in cages containing various kinds of soil 
as have the others. The light relations were the same as in all 
of the other experiments, although the light is of more impor- 
tance. 
b. Result: Tables 4-8. Distribution of larvae of C. sexgut- 
tata under experimental conditions. 
TABLE 4 
Relation to slope; sand dry at surface 
CLEAN SAND, 9 PT. eee CLAY,9PT. (FOREST 
SAND | HUMUS1 PT. HUMUS, 1PT. HUMUS 
1907 Ps 2 REMARKS 
| | 
Stale L |s|t/ ss ee Peat 
iolesee (mer oer 0) /-0))0-- | O- (0--/0-F) 0-25 10.0) OS —ssteep 
fanrae eet ee ONO pio” | 0. 14 7 | 5 0 0|0|L = level 
TABLE 5 
Relation to shade; sand dry at surface. 
glass roof and cage screen 
Sunlight in cages ts reduced to one-third by 
| SAND, 9 PT. FOREST | 
CUBAN SAND | HUMUS, | PT. Chay | ukeos 
= - REMARKS 
Selecw sae vu |sjulsiul 
Ah a Poem Re Mie en | 3's oe a Z 
| | 
TICLES ORS nek. 21. Sean ee ? rome Pe sa} 0 0 | S = shaded 
PANVAC © vit: bala 0 8 0 |0|0)|0| 0) U = unshaded 
