188 THE CANADIAN ENTOMOLOGIST. 



ON THE LARVAL STAGES OF CERTAIN ARCTLAN SPECIES. 



BY WM. BARNES, M.D., AND J. H. MCDUNNOUGH, PH.D., DECATUR, ILL. 

 (Continued from page 136.) 

 Apaiitesis incorrupt a H. Edw. 



We received a 9 of this species about the middle of June from the 

 neighbourhood of Redington, Ariz., which had deposited numerous ova en 

 route. The young larvae hatched within 1-3 days after receipt of eggs. 

 In all probability therefore, the duration of ovum stage is about 5 days. 

 Unfortunately, owing to our absence from home, the complete larval his- 

 tory could not be worked out. The early stages may however prove of 

 value, especially when compared with those of ?ievadeftsis, of which Dyar 

 lists incorriipta as a variety. We, ourselves, see no reason why it should 

 not enjoy specific rank. 



Ovum. — Very similar to that of other Apantesis species ; rather 

 conical, with flat base. Yellowish, turning black before emergence, laid 

 promiscuously. 



Stage I — Head and prothoracic shield blackish, latter with 4 anterior 

 and 4 posterior sette. Body pale reddish, with green of the food largely 

 showing through the skin after eating. Tubercles blackish, with a similar 

 arrangement to that of other Apantesis species. Tubercle I small, with 

 minute, white seta. The seta of tubercle H and the upper one of HI 

 black on abdominal segments ; all other setse long, white, increasing in 

 length on rear segments. On meso- and metathorax, tubercles I and II 

 possess one white and one black seta. Length 3 mm. 



Stage IL— Head, thoracic plate, and tubercles black ; body purplish 

 brown, shading into lighter ventrally, and tinged with orange at the base 

 of the lateral tubercles III-V. A pale, dorsal line and a broken subdorsal 

 one on a level with tubercle HI. Tubercle I minute, with single short 

 black seta ; on thoracic and two posterior abdominal segments, tubercle 

 II possesses a single long white seta, surrounded by 6 or 7 shorter black 

 ones ; on the remaining abdominal segments the white seta is lacking, and 

 the black sette are 5-6 in number. Tubercle III on thoracic segments 

 with two long black setœ and several small bisal ones ; on abdominal 

 segments with very long white central seta, a ring of about 4 shorter black 

 ones, and a small cluster of minute basal white hairs. Tubercle IV similar 

 in arrangement to III ; ventro-lateral tubercle with short white set?e. 

 Length 5 mm. 



June. 19.2 



