Xo. 4.] GYPSY MOTH — APPENDIX. 421 



and beiirs a prominent hair at each anterior angle. There 

 are also three pairs of hairs situated on the forward part of 

 the clypeus and two pairs directly between the eyes, one 

 pair being on the clypeus and one on the epicranium. 

 Antennre setaceous, four jointed and ferruginous. Eyes 

 conspicuous, and situated in groups of six each, on slight 

 elevations just behind the antennae. The mandibles are dark 

 brown in color, long, simple, stout at liase, Imt quite pointed 

 at the tip, the left mandible often folded over the right. The 

 maxillae and labium are small, ferruginous and provided 

 with well-developed palpi. Pro thorax large, as long as the 

 meso- and meta-thorax, slightly contracted and rounded 

 posteriorly. Meso-thorax slightly rounded posteriorly ; 

 meta-thorax truncate. Lateral edges of the body segments 

 slightly produced. Dorsal line prominent on all the seg- 

 ments except the last. On the dorsum of each thoracic seg- 

 ment there are ten short hairs, one on the anterior part of 

 each lateral margin, one at each angle of the segment and one 

 on each side of the dorsal line at the anterior and posterior 

 margins. Abdominal segments, nine in number, with the 

 exception of the last, truncate behind, the last segment being 

 rounded posteriorly and bearing a pair of caudal appen- 

 dages. Each segment except the last bears six hairs, one 

 on each lateral margin and two on each side of the dorsal 

 line at the posterior margin. The last abdominal segment 

 bears a pair of hairs on each lateral margin, but none on the 

 dorsum. The caudal appendages are entire, although prob- 

 ably jointed at the base, and bear numerous hairs. The 

 spiracles are situated just below the dorsal plates. The 

 ventral portion of the body is of a yellowish white except 

 the portions which are strengthened by chitinous plates. 

 These are of the same color as the dorsal part of the l)ody. 

 Legs well developed, provided M^ith stout s[)ines which are 

 especially prominent at the joints, the tarsi bearing two 

 claws. The last body segment bears on the posterior 

 ventral portion an appendage which serves as a proleg and 

 aids in locomotion. The larva remains in this stage about 

 four days. Molting is accomplished by a splitting ot the 

 thoracic plates along the dorsal line ; the head, mouth parts 

 and legs are then w^ithdrawn and the exuviaj forced back 



