232 THE PEANUT— THE UNPREDICTABLE LEGUME 



Egg 



The eggs are deposited in the tissues of the stem and leaves. 



Larva, first stage 



Length about 0.23 mm.; width of mesothorax 0.11 mm. General shape fusiform. 

 Color of posterior part of thorax and entire abdomen pale yellow ; elsewhere pearly 

 white. Head quadrate; eyes reddish. Antennae 0.15 mm. in length; distinctly four- 

 segmented; basal segment cylindrical, short; second ovate, slightly shorter than 

 the third; third slightly conical, the apex joining the second; fourth fusiform, 

 widest near the basal fourth, about equal in length to the other three. The fourth seg- 

 ment is distinctly annulated, the second and third indistinctly so; setae are present 

 on all segments, most numerous on the fourth. Legs translucent white, stout. Abdo- 

 men tapering posteriorly; with ten segments, the first eight nearly equal in length, 

 the ninth twice and tenth three times the length of the preceding. Each abdominal 

 segment with longitudinal rows of setae, the ninth with two and tenth with four 

 spines that are four times the length of the setae. 



Larva, second stage 



Length from 0.6 to 1.17 mm. ; width of mesothorax from 0.14 to 0.2 mm. ; shape 

 same as in first stage. Color of thorax and abdomen yellowish, with exception of the 

 last abdominal segment. Head quadrate; antennae with four segments, the fourth 

 being more distinctly annulated than in the first stage. Abdomen with the setae in- 

 creasing in length posteriorly; ninth and tenth segments about equal in length, 

 each less than twice the length of the others. 



The young nymph or prepupa 



Length, 0.52 to 0.62 mm.; width of mesothorax, 0.10 to 0.12 mm. Antennae 

 translucent, extending forward, much shortened and composed of five segments, 

 first two cylindrical and very short, third and fourth globose, fifth tapering to the 

 apex. The last segment of the abdomen is set with four spines by use of which the 

 young nymph seems to protect itself, when approached by another the abdomen 

 being turned upon it. The wing sheaths are very noticeably separated, the upper one 

 extending to the middle of the second segment, the lower one to the middle of the 

 third segment. The legs are translucent white, stout. 



The full-gromn nymph or pupa 



Length, 0.68 to 1.22 mm.; width of mesothorax, 0.15 to 0.20 mm. Shape similar 

 to the adult. Color yellowish; head, antennae, wing pads, legs, and caudal segments 

 of the abdomen varying to pearly white. Antennae extending to the middle of the 

 prothorax. Three yellowish ocelli between the eyes, the latter dark red. Wing pads 

 so closely applied as to appear single, extending to the middle of the fifth abdominal 

 segment ; length from head to tip of wing pads 0.39 mm. The abdomen is noticeably 

 contracted longitudinally; greatest width, 0.24 mm.; longest setae, 0.078 mm. 



Adult 



Average length, 1.05 mm. (0.95 to 1.13 mm.) ; average breadth at middle of 

 abdomen, 0.27 mm. (0.225 to 0.285 mm.). General color of head and thorax light 

 brown or tawny yellowish-brown ; abdomen dark brown. 



Head about one and one-half times as wide as long, frequently slightly retracted 

 under anterior margin of prothorax ; occiput transversely wrinkled, posterior margin 

 strongly thickened and darker in color; anterior margin slightly bisinuate, cheeks 



