233 



Ageioultueal Experiment Station, Ithaca, N". Y. 



represent the relative differences in size between the different stages; 



and the gradual growth of the conspicuous black wing pads, in figure 



8, from what seems but black 

 spots in the first stage. The 

 figures also show, clearer 

 than descriptions would, the 

 changes which take place in 

 the black markings on the 

 body and its appendages at 

 the diffei'ent moults. 



During the first three stages 

 the whole body is of a vermil- 

 ion red color with the legs 

 and anteanafe blackish green; 

 the last autennal joint has a 



Fig. 8.— Nymph after fourth moult: fifth and last n-.- , u'l ^ i j- 



nymphai stage. distinct reddish shade and is 



slightly enlarged. In the fourth and fifth stages the distal half of the 

 second and all of the third and fourth joints of the antennae are black; 

 the last joint becomes slenderer, and the basal portion of each antenna 

 and the legs are of a light yellowish green color with two irregular bands 

 of black across the dorsal aspect of each femur, and a yellowish green 

 stripe appears on each wing pad. In the fourth stage the head and 

 first thoracic segment are orange yellow in color, and a day or two 

 after the fourth moult the whole body is of a similar color with irregu- 

 lar lighter yellowish stripes between the rows of black spots on the 

 abdomen. In all the nymphai stages hairs occur on the head and arise 

 in rows from black spots on each abdominal segment. In all stages of 

 the insect, including the adult, the antennae are thickly set with black 

 hair, and as each joint is lighter at its extremities they have a ringed 

 appearance; the legs are set with many short black spines; the eyes 

 are always prominent and of a dark reddish brown color; the tip of the 

 beak is black and a large black spot occurs on its base. 



The newly hatched nymph (Fig. 4) measures 1.3 mm. (.05 inch) in 

 length. The first moult occurs in three or four days. 



The second nymphai stage (Fig. 5) lasts three days, and the insect 

 attains a length of 2.1 mm. (0.8 inch). 



After its third moult (Fig. 6) the nymph increases in length to 

 three mm. (.12 inch), and the fourth moult occurs in from two to three 

 days. 



The fourth stage (Fig. 7) is passed in from five to seven days, and 

 the nymph then measures 3.7 mm. (1.45 inch) in length. 



