March iS9q.) 



PSYCHE. 



387 



ing ; ocelli black, mouth faintly brown ; 

 width I mm. Body green ; dorsal line 

 straight, white, crinkly edged ; tubercles i and 

 ii white; subdorsal line straight, narrow, 

 white; tubercles iii and iv less distinctly 

 white; substigmatal line distinct white, 

 moderately broad, somewhat shaded below, 

 just covering spiracles. Feet green, those of 

 7 and S smaller than the others. Tubercle 

 iv opposite lower edge of spiracle. 



Singe /K Head i.S mm. All pale green, 

 joint 12 a little enlarged; feet nearly equal. 

 Lines and tubercles white, dorsal and sub- 

 dorsal lines narrow, rather pulverulent ; 

 stigmatal moderate, enclosing the spiracles 

 except on joints 2 and \2, a dark green 

 shade above it reaching to tubercle iii. Feet 

 green, shields and plate uncornilied, obscure. 

 Tubercles minutely black in white rings; iv 

 at the lower edge of spiracle; setae rather 

 long, tine, dusky. Spiracle white, finely 

 black rimmed. 



Stage V. Head green, ocelli narrowly 

 black centrally, labrum white ; ^\idth J.7 mm. 

 Green, plates invisible; skin finely white 

 dotted, lines white; dorsal line distinct, 

 obsolete at the ends ; subdorsal narrow, faint, 

 half as wide as the dorsal; stigmatal narrow, 

 about the width of the spiracles which it half 

 encloses except on joints 2 and 12, covering 

 tubercle iv ; a dark green shade above, diffuse. 



fainter at the spiracles. Subventer white 

 dotted; feet clear green, equal. Body slender, 

 joint 12 slightly enlarged. Tubercles and 

 spiracles white, the latter ringed. 



Sta^c \'[. Head pale brown, shining, 

 reticuhite with darker brown, shaded in 

 clvpeus and at base of antennae; labrum 

 wliitish ; ocelli pale; width 4.6 mm. Body 

 cylindrical, joint 12 a little enlarged on top; 

 feet equal. Light yellow-brown ; dorsal and 

 subdorsal lines narrow, pulverulent and 

 broken, brownish white, bordered with darker 

 brown ; oblique subdorsal shades brown, 

 running between tubercles i and ii forward 

 and outward ; skin mottled, dotted with 

 whitish; substigmatal line moderately broad, 

 whitish on the edges, centrally of the color 

 of the body, the lower edge finally fading 

 out, lea\ ing a very narrow pale line cutting 

 the spiracles. Feet pale; setae white; cer- 

 vical shield and anal plate not cornilied, not 

 lined. Spiracles white, black ringed. Later 

 the larvae fade to a pale greenish brown, the 

 lines becoming faint and the head appearing 

 dark by contrast. Setae single, normal, iv 

 opposite lower edge of spiracle. 



The larvae hatched early in M.iy and 

 entered the earth in June. Tliey fed on 

 various leaves, but seemed to prefer willow, 

 on which they throve. The imagoes ap- 

 peared in August. 



FOUR NEW SPECIES BELONGING TO THE GENUS PLENO- 

 CULUS FOX. 



BY WILLIAM H. .4SHMEAD, WA.SHINGTON, D. C. 



The genus Plenoculus Fox was erected in 

 Psyche, Vol. VI, 1893, p. 554, with one spe- 

 cies P. davisi. Since that time, however, 

 four additional species have been described, 

 three by Fox and one by myself. I have 

 now the pleasure of presenting descriptions 

 of four new species and giving a table for 

 distinguishing all of the species. 



The genus is unknown outside of boreaU 

 North America. 



Table of Species. 



Clypeus anteriorly not emarginate me- 

 dially 2 



Clypeus anteriorly emarginate, or excised 

 medially, dentate or denticulate laterally. 



