REPORT OF THE STATE ENTOMOLOGIST IO,I2 



43 



The full-grown larva, as stated above, resembles that of the true 

 army worm and may be best distinguished therefrom by the nar- 

 rower head with its inverted Y-shaped mark well shown in the 

 accompanying illustration. 



a b . c . 



Fig. 3 Fall army worm, a, Head of larva; b, c, surface of larval skin 

 showing microscopic markings. (After Forbes, 23d Rep't, Ins. 111. 1905) 



The following descriptions of a half-grown larva and a full- 

 grown one were drafted from living material. 



Larva, half grown. Length one-half inch. Head shining black 

 dorsally, the genae yellowish ; clypeus fuscous yellowish and bord- 

 ered on each margin by a distinct whitish line which is produced 

 posteriorly over the head and forms a well-defined median line 

 extending nearly to the posterior extremity. Labrum yellowish, 

 labial palpi dark brown, antennae short, dark. Cervical shield shin- 

 ing black with distinct median and sublateral white lines. Body 

 with the dorsal submedian areas a variably mottled chocolate brown 

 and yellowish brown. This area is margined by a yellowish white 

 lateral line. Laterally there is a broad stripe of dark chocolate 

 brown variably marked with whitish and light brown and margined 

 ventrally with a yellowish white stigmatal line. There is an indis- 

 tinct substigmatal line, the substigmatal and ventral area being a 

 variable yellowish brown ; dorsally and laterally there are the usual 

 series of large, shining, dark brown spiracles bearing short, black 

 hairs ; suranal plate shining black ; truelegs shining black, prolegs 

 fuscous yellowish. 



A lighter specimen of about the same size, evidently recently 

 molted, shows little of the characteristic markings described above, 

 the head being yellowish transparent, the cervical shield and tuber- 

 cles mostly light brown. The lighter longitudinal lines are only 

 faintly indicated. 



