8 
cane, attributed by some writers to the changa, is probably the work 
of grubs. After the cane is about two months old and the young 
shoots have hardened, the changa is no longer a danger to the crop. 
Most garden crops, and especially corn, tomato, cabbage, lettuce, 
and pepper, suffer severely from the changa. In the laboratory when 
sprouted corn was used for food the insect ate not only the stalk 
but in many cases the kernel as well. Nursery plantings of Living- 
stonea palm seedlings at the station were badly injured. Experi- 
mental plats of alfalfa were not damaged, although changas were 
present in the soil. Barrett (2, p. 9) has noted that plants having 
an acrid sap are usually free from attack. 
The plants not acceptable as food are often injured by the changa 's 
habit of trimming roots that lie along its path. Much damage of 
this kind may result from the active tunneling done by the insect. 
The known food plants of the changa are tobacco, tomato, egg- 
plant, potato, pepper, sugar cane, grama grass {Paspalum sp.),yerba 
dulce (Eleusine indica), Bermuda grass (Oynodon dactylon), rice, 
cabbage, collard, rape, turnip, cantaloup, sweet potato, lettuce, 
Coleus spp., and Living stonea sp. 
DESCRIPTION OF ADTJLT. 
GENERAL DESCRIPTION. 
The adult changa (PI. I) is generally brownish in color with more 
or less constant darker markings. The average length without an- 
tennae or anal cerci is about 30 millimeters (1J inches). Consider- 
able variation in size is found, males varying from 19 to 34 milli- 
meters and females from 24 to 36 millimeters. 
HEAD AND APPENDAGES. 
The large head is protected posteriorly by the pronotal shield. 
The black compound eyes are fairly conspicuous; just above and 
between them is a pair of pearly white, obovate, slightly convex 
ocelli. The antenna? arise at the lower margin of the eyes and 
between them; they are filamentous and about one-third the body 
length. The apparently unbroken antenna? of a male were composed 
of 87 segments, the largest number noted for the species. The cly- 
peus is light brown and leathery and covers completely the black, 
heavily chitinized tips of the mandibles. The area just above the 
base of the clypeus is a mottled dirty white. 
THORAX AND APPENDAGES. 
The prothoracic shield is the most conspicuous part of the insect 
and is the only part of the thorax that can be seen from above. It is 
a tough, leathery, subovate, convex capsule, with darker markings on 
