1974] 
Eisner et al. — T'enebrionid Beetles 
195 
Fig. 7. Response of Adelium percatum to pinching of its right midleg. 
The animal everted its right gland abruptly, causing secretion to be sprayed 
forward. The droplets of secretion are shown as black spots on the indi- 
cator paper that served as substrate (filter paper impregnated with acidified 
aqueous solution of potassium iodide and starch). Far-ranging discharges 
as shown here occurred only when beetles had fully replete glands. Fig. 8. 
Cuticular organelles from secretory cells of gland of A. percatum , isolated 
by treatment of gland with warm 10% aqueous potassium hydroxide 
(Nomarski interference contrast; reference bar = 30/*). Fig. 9. Scanning 
electronmicrograph of hairs on exposed surface of everted gland of A. 
percatum (reference bar = 5/i) . 
