THE SUGAR-CANE MOTH BORER. 
17 
cles dark brown, in some specimens almost black; thornlike tubercles of ab- 
dominal segments 8, 9, and 10 stout and very prominent. 
THE ADULT. 
The adult (fig. 5; PL V) is a straw-colored moth, the forewings 
marked with darker lines. It varies in size, average specimens meas- 
uring about an inch across the wings. 
Fig. 5. — The sugar-cane moth borer : Adult with wings folded. 
In his article, " The American Species of Diatraea Guilding," Dr. 
Harrison G. Dyar (45) describes the moth as follows: 
Diatraea saccharalis Fabricius. 
This species is divisible into a number of well-marked geographical forms. 
Two of them occur in the United States. The typical saccharalis reaches us by 
the way of the West Indies and occurs in Florida. The race cramUdoidcs Grote 
eomes from Mexico and occurs in the Gulf States. . . . 
Diatraea saccharalis crambidoides Grote. 
Chilo crambidoides Grote, Can. Ent, XII, 15, 1880. 
t Crambus lincosellus Walker, Cat. Brit. Mus., XXVII, 162, 1863. 
In this form the front is roundedly prominent, slightly projecting above the 
eyes, but without cone or tubercle. The male has the hind wings dusky, those 
83363°— 19— Bull. 746 2 
