April 1899.] 



PSYCHE. 



349 



SPATHULATE HEAD SETAE ON THE LARVA OF CHAMYRIS 

 CERINTHA TREITS. 



BY HARRISON G. DYAR, WASHINGTON, D. C. 



I had occasion to notice spatlinlate liead 

 setae in tlie case of Cicinnus mehheimeri 

 (Joiirn. N. Y. ent. soc, iv, 92). A second 

 instance is found in Chamyris cerintha, 

 thougli here it is the first epicraneal seta 

 that has become flattened instead of the 

 fourth, and the structure disappears at the 

 last moult. A condensed description of the 

 last stage of the larva has been given by 

 Mr. Coquillett (Papilio i, 56); but he does 

 not refer to the spathulate hairs of the early 

 stages. I assume the number of stages for 

 convenience in indicating them ; I do not 

 know that seven is the true number. 



Stage IV'. Slender, anal feet divergent : 

 head strongly bilobed, the lobes angular, the 

 apex black with a line passing down both 

 front and back lateral angles ; green ; seta i 

 short, spathulate ; width 1.2 mm. Body with 

 joint 12 slightly enlarged ; setae single, stiff, 

 coarse, black; i, ii, iii; v, pointing sharply 

 forward, iv and vi backward, all normal, seta 

 iv behind the middle of the spiracle; leg 

 shields small with few setea. Green; tu- 

 bercle i on joints 5 to 7 enlarged and black ; 

 an obscure white lateral line above wart iii; 



anal feet and a subventral dash on joint 12, 

 crimson. The two anterior pair of abdom- 

 inal feet are slightly weaker than the others. 



Stage V. The same; a broken reddish 

 line runs along warts i and ii, which are 

 nearly in line; white lateral line distinct. 



Stage VI. The same ; the white lateral 

 line is sharply edged; head green, the black 

 lines fainter than before, seta i still spath- 

 ulate. 



Stage VII. Head more rounded, seta i no 

 longer spathulate, very short; the lobes 

 are low, not angular. Body slender, dorsum 

 between the distinct white lateral lines filled 

 in with dark vinous purplish, the subventral 

 regions green. Setae coarse, long and black ; 

 tubercle ii on joint 12, and i on 13 large, 

 high and conical, the others normal. 



The line on the head is abbreviated, 

 partly or wholly brown ; width 2.5 mm. Ab- 

 dominal feet essentially equal. 



Food plants. Wild cherry and plum. 



Larvae solitary, very active and quickly 

 spring off of the plant when disturbed, like 

 some Deltoids. 



AN APPARENTLY NEW LECANIUM FOUND ON WHITE CEDAR. 



BY T. D. A. COCKERELL AND G. B. KING. 



This article is written by Mr. Cockerell, 

 but is partly based on Mr. King's notes and 

 observations. 



When Mr. King sent me a small almost 

 globose Lecanium found on White Cedar, 

 I could hardly believe it could be anything 



but a form of L. Jtetcheri, especially since he 

 had found some veritable fletcheri in Massa- 

 chusetts on arbor-vitae. A close examina- 

 tion of the Cedar scale, however, reveals 

 differences which must surelv be specific, so 

 the insect is described herewith. 



