164 



PSYCHE. 



[October 1S91 



concolorous with the body. Hair whitish, 

 but black and shorter from the warts of row 

 3 on joints 4, 5 and 12. Longer white 

 hairs overhang the head. 



Fourth stage. Head pale whitish, labrum 

 and antennae white, jaws brown, ocelli black ; 

 width 1.3 mm. Body and warts whitish with 

 a narrow, broken, black subdorsal line. Hair 

 white with pencils of orange colored hair 

 from the warts of row 2 on joint 4 and of 

 white hair from row 3 on joint 12 besides 

 short black ones from row 3 on joints 4, 5 

 and 1 1. 



Fifth stage. As before; width of head, 1.7 

 mm. The pencils of hair are now arranged 

 as follows : mixed orange and white hair 

 from row 2 on joint 3, all orange from row 



2 on joint 4, white from 3 on joint 12 and 

 from 4 on joints 3 and 4, only slight on 

 joint 3. Short black hairs from row 3 on 

 joints 4, 5 and 11. Spiracles black ringed. 



Sixth stage. Width of head 2.5 mm. 

 Body whitish, a row of black spots surround- 

 ing the white spiracles and another subven- 

 tral row. Hair white, forming a ridge like a 

 keel along the dorsal line. Pencils as in the 

 mature larva. 



Seventh stage. Head brownish testaceous, 

 shiny, mouth and antennae white, eyes black, 

 width 3.5 mm. Body sordid white, the warts 

 arranged as in the other genera of the Arc- 

 tiidae except that row 4 is situated stigmat- 

 ally, posterior to the spiracles and the four 

 ventral warts (row 7) are very small, situated, 

 as usual, on the venter of the apodal segments 

 (the 1st, 2nd, 7th, 8th and 9th abdominal 

 segments). Some irregular black subdorsal 

 marks on joints 2 to 4 partly surrounding the 

 warts of row 3 and some slight marks above 

 the bases of the legs. Spiracles white, in a 

 narrow black border. Hair pale straw color 

 or very pale grayish, keeled on the dorsal 

 line. From warts 2 on joints 3 and 4 a pencil 

 of orange colored hairs ; from warts 4 on 

 joint 3 (slightly) and joint 4 and from warts 



3 on joint 12 a pencil of white hairs; a few 

 long hairs from the large wart on joint 13. 



Cocoon. Composed of hairs and silk, of 

 dense texture, but comparatively smooth, the 

 hairs being laid on flat and not as with H. 

 caryae. 



Pupa. Thorax and abdomen enlarged, the 

 latter narrowing each way from the middle; 

 abdominal segments appressed, motionless; 

 cremaster represented only by 4 or 5 spiny 

 hairs with their ends enlarged or curled. 

 Body sparsely punctured, cases creased. Col- 

 or shining dark mahogany. Length 15 mm., 

 width 6.2 mm., height 5.7 mm. 



Food-plant. Sycamore {Acer fiseudo-filan- 

 tantis). Larvae from Ulster county, N. Y. 



Halisidota tessellaris Smith and Abbot. 



Egg. Not observed. 



First stage. Head black, width 0.4 mm. 

 Body whitish shaded with yellow dorsally on 

 joints 3, 4 and 12. Cervical shield warts and 

 anal plate black, each wart bearing a single 

 hair. 



Second stage. Head 0.6 mm. wide. Body 

 as before but the hair is more abundant, sev- 

 eral growing from each wart. 



Third stage. Head black, labrum and 

 antennae white; width 0.9 mm. Body as 

 before, wart.s of rows 1, 2 and 3 black and 

 a subdorsal blackish line centrally. Hair 

 more abundant, especially at the extremities. 



Fourth stage. Head 1.3 mm. wide, colored 

 as before. Body whitish, with large subdor- 

 sal orange spots posteriorly on joint 3 and 

 anteriorly on joint 4 and on joint 12. The 

 warts are arranged as in the mature larva, 

 rows 1, 2 and 3 are black, the rest pale. All 

 the warts bear thin short, whitish hairs. 



Fifth stage. As before, but the head is 1.7 

 mm. wide, and from warts 2 on joint 4 grow 

 pencils of black hair, from row 1 on joint 12 

 the same but the two converge over the dor- 

 sum to form a single tuft. White pencils 

 from wart 3 on joint 12. Other hair whitish, 

 longer hairs overhanging the head and pos- 

 terior extremity. The dorsal region of the 

 body is blackish, the sides pale. Spiracles 

 white, distinct. 



