; 
INSECTS INJURIOUS TO THE ELM. - 65 
into rags ; towards the end of July or early in August entering the ground, forming an 
oval cavity a few inches below the surface ; assuming the pupa state a week before 
they appear as beetles in June. (Riley.) 
Fic. 25.—The great elm-leaf beetle. a, b, eggs; d, larva; g, h, head and'‘mouth parts of the same; 7, 
pupa; j, beetle.—After Riley.* 
15. THE INTERROGATION BUTTERFLY. 
Grapta interrogationis (Fabricius). 
Injuring the foliage of the elm as well as linden tree and hop-vine, a caterpillar, with 
reddish black, bilobed head, and black body covered thickly with streaks and dots 
*This and several other cuts have been loaned by the permission of the Hon. George B. Loring, 
Commissioner of Agriculture. 
5D RIL 
