August iSq6.] 



rsrcHE. 



415 



mouth brown ; width .3 mm. Body entnelj 

 colorless, the hairs single, rather long, 

 white; anal feet rather large, divergent; 

 length 2.5 mm. Later certain of the dorsal 

 hairs (of tubercle ii) and all the warts 

 become blackish. After feeding the body 

 is greenish from the food showing bj trans- 

 parency, the head, thoracic feet and joint 13 

 slightly yellowish. Warts normal, single 

 haired, iv behind the spiracle, vi absent, an 

 oval dusky leg-plate with several hairs; on 

 joints 3 and 4 tubercles ia, ib and iia from a 

 single area, lib weak, remote, iii and v 

 absent, vi with two hairs. On joint 13 i, ii 

 and iii from a single area, iv and v from a 

 single area, the anal plate with 10 hairs. 



Stage II. Head yellow, shining, ocelli 

 black; width .4 mm. Body whitish, yellow 

 at the ends as in the mature larva; warts 

 all black, neatly defined, several, haired, 

 arranged as in the mature larva, the sub- 

 primaries present, normal. Hair black and 

 white mixed, the white the most numerous, 

 spinulated ; warts iv and v on joints 5 and 1 1 

 a little larger than elsewhere, the hairs, 

 however, all alike. Leg-plates pale. 



Stage III. Head .6 mm., whitish, the 

 ends of the body yellow; warts black, all 

 much as before, the hairs quite dense, but not 

 at all obscuring the body, variously curved, 

 iVom six to ten arising from each wart. 



Stage IV. Head .8 mm. The same, the 

 warts distinct, neatly defined; hair a little 

 thicker laterally on joints 5 and ii, indicating 

 the tufts, but no plumed hairs present. 



Stage V. Head 1.2 mm. There is no 

 change; length about 14 mm. 



Stage VI. Head 1.7 mm. Similar to the 

 mature larva except for the absence of the 

 side tufts, though warts iv and v on joints 

 5 and II bear an unusual number of black 

 hairs, thus serving to suggest the tufts. The 

 hairs are all alike, black and white, of even 

 length, abundant, but fine, not obscuring the 

 body. A distinct orange mark on joint 12 

 before the spiracle. A few long hairs 

 anteriorly. 



Stage VII. Mature larva. Head yellow, 

 ocelli black, mouth brown; width 2.4 mm. 

 Body yellowish on joints 3, 4, 12 and 13, 

 joint 12 most distinctly so. as also the feet; 

 warts and spiracles black; i to iii normal, iv 

 small but distinct, behind the spiracles, v 

 and vi normal, none large. Hair dense, 

 fine, of even length, black, and white mixed, 

 the white predominating, the appearance 

 consequently pale gray, sparsely dashed 

 with black. On joints 5 and 11 dense con- 

 colorous tufts laterally, the same length as the 

 other hairs and also white and black, hut 

 heavily feathered, the black ones plumed; 

 these tufts arise from warts iii and iv. On 

 the thorax there is one large wart above the 

 stigmatal wart, but it is not elongated nor 

 of unusual size; a few long hairs from it 

 overhang the head. On joint 2 the cervical 

 shield has two tiny warts on each side, a 

 wart at the edge, a stigmatal and a subven- 

 tral wart. Skin translucent, without marks. 



Cocoon. Large, elliptical, attached only 

 by one side to the supporting object as in 

 Halisidota caryae, composed of silk and the 

 larval hairs, transparent, regular, light yel- 

 low, intermixed with black plumed hairs; 

 size 17 X 9 mm. 



Pupa. Rounded, shaped as in Halisidota, 

 the incisures not movable. All pale yellow, 

 spiracles, eyes and a row of dorsal marks 

 black. The pupa skin is very thin, but all 

 the essential points indicate an Arctian affi- 

 nity, not Lyniantriid as stated in Ent. Amer. 

 (vol. i. p. 86) where the editor was evidently 

 misled by the transparent skin of the empty 

 pupa. His statement should be reversed. 

 Imago in 2i days. 



Note ox Dionvchopus. — In Psyche for 

 Jul3' Mr. R. A. Cooley questions the accuracy 

 of the results of Dr. V}. Donitz in respect to 

 the structures \t\- Dionychofiis niveus Men. 

 which could be capa';.'le of producing a sound 

 heard by Dr. Donitz. This has led me to 

 examine the species, and I believe that Mr. 

 Cooley is entirely correct. The spiny patch 

 IS present on the u.uler side of the fore wing 



