No. 4.] GYPSY MOTH — APPENDIX. 409 



narrow, circular, dark-brown hand, while at the centre there 

 is a small dark-brown dot. The areas covered by the circle 

 and dot are depressed. Embryonic development was ap- 

 parent June 22, and on June 29 the eggs hatched. 



First JStage. — (F\iitQ 2, Fig. 3.) The newly hatched 

 bug, with legs and antennse much longer than the body, 

 presents indeed a most uniqua appearance. In this stage 

 the nymph feeds readily on aphids, and does not hesitate to 

 attack insects considerably larger than itself. Length of 

 body, 2 mm. ; of antemife, 4 mm. ; general color pale 

 amber, darkening after the insect has taken food. Head 

 large in proportion to the rest of the body, projecting 

 between the antennse. A transverse groove crosses the 

 head behind the dark-red eyes. Beak reaching to the 

 anterior coxte. Basal joint of the filiform antennae as long 

 as the three outer joints. These latter are of nearly equal 

 length. Thorax somewhat longer than either head or 

 abdomen, with lateral projections on each segment. Legs 

 long and very slender. Abdomen compact, sparsely hairy, 

 with well-defined segmentation. 



The young bugs were reared on aphids found on Gory- 

 dcdis glauca and Hammamelis virginana. On July 3 nearly 

 all had passed the first molt. 



Second Stage. — Length, 2.6 mm. General color darker 

 than in preceding stage. Form similar, but abdomen much 

 longer in proportion to the rest of the body than in first 

 stage. Most unfortunately all the nymphs died soon after 

 passing the first molt. In this stage the nymphs first 

 showed the habit so common to the imago, of raising the 

 fore legs above the head upon the slightest disturbance. 

 The insects were apparently able to walk as well with Ijut 

 four legs as with six. 



Full-grown JSTi/mpli ; Fourth (?) Stage. — (Plate 2, Fig. 

 4.) Length, 11 mm. Body slender, elongated ; color light 

 green, faintly marked with brown. Head narrow, widest 

 at the eyes, the latter being of a brick-red color. Behind 

 the eyes the head is shaded with reddish brown. Thorax 



