. Bulletin of the Department of Agriculture. Agriculture. 16 BULLETIN 746, U. S. DEPARTMENT OF AGRICULTURE. Winter form (PI. Ill, fig. 6) : Differs from summer form in the following characters: Body tubercles white or pale yellow and not easily distinguished from ground color of body. Spiracles black, very distinct, and sharply con- trasting with rest of body. Average length (4 specimens) mm. THE PUPA. On molting for the last time the larva enters the pupa stage, the quiescent period of the insect. The pupa (fig. 4) at first is white, but soon changes to a dark â f- ... jcs / ^IV bro
. Bulletin of the Department of Agriculture. Agriculture. 16 BULLETIN 746, U. S. DEPARTMENT OF AGRICULTURE. Winter form (PI. Ill, fig. 6) : Differs from summer form in the following characters: Body tubercles white or pale yellow and not easily distinguished from ground color of body. Spiracles black, very distinct, and sharply con- trasting with rest of body. Average length (4 specimens) mm. THE PUPA. On molting for the last time the larva enters the pupa stage, the quiescent period of the insect. The pupa (fig. 4) at first is white, but soon changes to a dark â f- ... jcs / ^IV brown. It is cylindrical in d~^~^^t$^k 9e form and bears little resem- ^ZzJS^'W^<i^ blance to either the larva or the moth. The following technical description has been written by Mr. Carl Heinrich: GENERAL CHARACTERS. Elongate; slender, pilifers well developed; maxillary palpi present; prothoracic and meso- thoracic legs not extending ceph- alad between sculptured eyepiece and antenna; sculptured and glazed eyes, labrum, frontocly- peal suture, and invaginations for anterior arms of tentorium clearly indicated; front ex- tended upward into two hornlike projections; maxillae prominent, only half the length of the wings; wings extending to mid- venter of fourth abdominal seg- ment ; mesothoracic legs not ex- tending to end of wings; meta- thoracic legs extending to, or a trifle beyond, tips of wings; femora of prothoracic legs clearly indicated; antenna? not reaching tips of wings; body roughened but without hooks or prominent seta?; cremaster absent; posterior end broad; tubercles of the eighth, ninth, and tenth segments developed into stout, sharp, thornlike projec- tions ; dorsum of prothorax, mesothorax and metathorax and the first nine abdominal segments rugosely scobinate; on segments 5, 6, 7, and 8 of the abdo- men the scobinations form a median band encircling each segment; a deep furrow on dorsum separating ninth and tenth abdominal segments; genital open- ing single a
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
