No. 4.] GYPSY MOTH — APPENDIX. 427 



mouth parts dull black, not shining. Head large, as long 

 as wide, dorsal surface flattened ; palpi prominent, longer 

 than antenujv. Posterior margin of the head somewhat 

 emaro^inate at the centre. First thoracic seo-ment as lono; 

 as tlie two following, slightly wider tlian the head and edges 

 produced laterally. All the body segments except the last 

 are truncate behind, and bear a prominent impressed dorsal 

 line. Caudal appendages present, simple and provided with 

 numerous spines. 



Ventral portion of the body nearly pure white, but is 

 profusely covered with small black chitinous plates. Spir- 

 acles nine, black, circular and arranged just below the 

 lateral edges of the dorsal plates. Anal proleg moderately 

 stout. After feeding for a week the larvse molted. 



Second Stage. — Soon after molting the larva3 became 

 black and measured 18 mm. in length. Body somewhat 

 stouter than in preceding stage. Head longer than wide, 

 emarginate l)ehind. Prothorax wider than the head. Dor- 

 sal line quite prominent. Abdominal segments truncate 

 and slightly produced laterally. The second molt occurred 

 at the end of a week. 



Third Stage. — The following description was not made 

 until the larva was almost ready to pupate. Length, 

 30 mm. Color, dull black. Head of medium size, flat- 

 tened, truncate behind. Clypeus slightly broader in front 

 than in C. frigidum. Strongly bilobed. Suture between 

 clypeus and epicranium sub-obsolete. Mandibles stout, the 

 large tooth (Plate 3, Fig. 10) near the base being deeply 

 cleft on the inner margin. Prothorax lono-er than the head, 

 the hind angles slightly curved. Meso- and meta-thorax 

 smaller, but similar in shape, each thoracic segment bearing 

 four i)airs of hairs on the dorsal plate. The abdominal 

 plates one to seven of the same form and bearing a moderate 

 carina near the posterior edge of the segment. Eighth 

 segment a little larger, slightly wider, and also bearing a 

 carina, lateral edaes of each abdominal seo-ment bearino; 

 three short hairs. -The last segment (Plate 4, Figs. 5, 6) 

 small, posterior angles produced backward, but hind edge 



