October 1S91.J 



PSYCHE. 



165 



Sixth stage. Head shiny black, labrum 

 and antennae white; width 2.1 mm. Body 

 black above, whitish below, the hair gray and 

 the pencils now arranged as in the mature 

 larva. 



Seventh stage. Head black, labrum and 

 bases of antennae white; width 2.7 mm- 

 Body black, obscured by the thick hair; ab- 

 dominal feet whitish; spiracles white. From 

 warts 2 on joints 3 and 4 and from warts 3 on 

 joint 12 grow pencils of long black hair and 

 from warts 4 on joints 3 and 4 and from the 

 large wart on joint 13, thinner pencils of 

 white hair. Other hair even and close, 

 keeled on the dorsum, light drab or dull 

 ochre. Warts gray, except warts 3 on joint 

 12, which are pale and have orange about 

 their bases. Only traces of the orange 

 marks on joints 3 and 4. 



Eighth stage. As before. Head 3.5 mm. 

 wide ; body velvety black, the hair on the 

 ■dorsal ridge appearing somewhat darker 

 than elsewhere. 



Ninth stage. Head black and shiny, la- 

 brum and antennae white; width 4.3 mm. 

 Body black, marked as in the seventh and 

 eighth stages. Spiracles white. Thoracic 

 feet testaceous; the abdominal, pale. Cervi- 

 cal shield black, bisected. Hair drab or dull 

 ocher yellow, the pencils as before, but now 

 11 mm. long. The warts are arranged as in 

 H. harrisii. 



Cocoon. Composed of hairs and silk, of 

 dense texture, but comparatively smooth, 

 the hairs being laid on flat. 



Pupa. Like that of H. harrisii. 

 Food plants Nearly all deciduous trees 

 except the sycamore. The larvae here des- 

 cribed in the first stage occurred on beech 

 (Fagus) . 



Larvae from Dutchess county, New York. 

 Halisidota maculata Harris. 



Sixth stage. As in the following stage 



except that the hair is less abundant, not 



obscuring the body. Width of head 2.3 mm. 



Seventh stage. Head rounded, smooth 



shiny black, labrum and bases of antennae 



white; a few hairs; width 3.4 mm. Body 

 black, thoracic feet shiny black, the abdom- 

 inal ones white with black hairs and whitish 

 claspers, their minute hooks brown. Spira- 

 cles white. The warts are black, arranged 

 as in the other species of Halisidota, namely : 

 row 1 a wart on joints 5-12 inclusive, situ- 

 ated anteriorly ; row 2 subdorsal and row 

 3 lateral on joints 2-13, small on joint 2 

 and coalesced on joint 13 ; row 4 posterior to 

 the spiracles; rows 5 and 6 in the subventral 

 space, and row 7 four very small warts on 

 the venter of the legless segments. All the 

 warts bear spreading tufts of yellow feathery 

 hair, brighter in color than that of H. tessel- 

 laris. From warts 1 on joints 5-12 on the 

 upper side, grow black tufts forming a row 

 of square dorsal tufts as in H. caryae, 

 those on joints 5 and 12 a little longer than 

 the others; from row 5 on joints 5 and 11. 

 centrally on the wart, a rather long black 

 tuft ; from the upper parts of the warts of 

 rows 3 and 4 grow a few long white hairs, 

 as also from rows 2 and 3 on joints 5 and 11 ; 

 from rows 2 and 3 on joints 12 and 13 ante- 

 riorly a few more white hairs, those on joint 

 12 have a number of hairs, the one from row 

 3 on joint 12 forming a decided pencil, 

 though rather thin. Length of white hairs 

 10 mm. ; of larva 30 mm. 



Cocoon. Fastened by part of one side, 

 elongate elliptical, much like that of H. 

 caryae. It is rather thin, made of silk and 

 hair, the fine larval hairs stuck through, 

 making the cocoon appear something like 

 velvet. Length 21 mm., thickness 10 mm. 



Pupa. Thorax and abdomen enlarged 

 centrally with a depression between them ; 

 ventral side straight, slightly flattened; ends 

 obtusely rounded ; abdominal segments with- 

 out motion. The cremaster consists of a 

 tuft of spiny hairs. Color, shining dark 

 brown. Length 15 mm. ; width 6 mm. 



Food plants. Various deciduous trees. The 

 larvae were mostly found on maple (Acer). 

 Larvae from the Catskill Mountains. 

 Ulster county, N. Y. 



