560 VICTOR E. SHELFORD 
as is asserted by Comstock (’04), and have never seen them fly 
into vegetation, or crawl into crevices. 
2. Ecological relations of adults. a. General conditions at 
the point of study. My studies have been conducted along the 
west shore of Lake Michigan between Lake Bluff and Winnetka, 
Fig. 7 “Diagram showing Lake Michigan bluff as seen from the zenith. U, leve! 
surface of upland; BL, bluff; SB, sandy beach; M, water, L. Mich.; J, piers; to- 
ward the left is north; sand has lodged on the north side of the piers. AB and 
CD indicate positions of cross-sections below. 
Fig.8 Cross-section AB. Slumping bluff stage. The adults of C. limbalis are 
distributed from A—B; the larvae, sparingly, from EF to F. Other letters as in 
figs: 
Fig. 9 Cross-section CD; stage of some bluff stability and bare clay exposure. 
Adults of limbalis between C and D; larvae plentiful between G and H. Other 
letters as in fig. 7. 
Illinois, but my attention has been concentrated on the habitats 
near Glencoe, Illinois. 
Between the points mentioned, the lake is eroding its morainic 
shores. Steep banks have been formed by this action which 
are from 11.4 meters (38 feet) to 20.4 meters (68 feet) in height. 
