November .8,<,.l PSYCHE. 429 



LIFE HISTORIES OF NORTH AMERICAN GEOMETRIDAE.— VI. 



BV HARRISON G. DVAR, WASHINGTON, D. C. 



Percnoptilota Jiuviata Hiibn. This larva cles brown shaded and subventral spots about 



lias been described by European authors the tubercles, giving a superficial resem- 



(cjuoted in Packard, Mon. Geom., pp. 78, blance to broken transverse bands. Base of 



564, and by llofniann. Raup. gross Sch. thoracic feet and a band on the front of the 



Eur., p. 241), but I find no original descrip- foot of joint 10 dark brown; feet pale; skin 



tions in American literature. smooth, not shinj. Setae and tubercles very 



Egg. Rounded elliptical, flattened above small and obscure, 

 and below; one end depressed, the other a Stage IV. Head pale brown, thickly dot- 

 little flattened, not truncate. Surface with ted with dark brown ; a diffuse white stripe on 

 flattened areas, forming a many-sided poly- the face of each lobe widening above; apex 

 hedron, the cell areas scarcely concave, of clypeus brown; width 1.2 mm. liody 

 rounded hexagonal Shining pale greenish light green on the ventral half, almost with- 

 vellow. Size .6 X .4 X 3 mm. out marks, only tracesof longitudinal lines; 



Stage I. Head rounded, sordid luieous, dorsum darker green, with geminate dorsal, 

 dark ; width about .3 mm. Body rather thick, addorsal and subdorsal whitish pulverulent 

 smooth, of a sordid brownish, without marks, lines, separated, and the subdorsal edged be- 

 rather dark and somewhat transparent. Feet low by brown shadings, which are distinct 

 pale, setae obscure. After feeding the larvae intersegmentally and faint in the centers of 

 appeal- gieen, but dark and sordid, becoming the segments, nearly absent and broken 

 moi-e translucent with growth, the tlnuax into spots at the extremities. Abdominal 

 and joints 10 to 13 only brownish. The larvae feet strongly lined with dark brown, es- 

 rest in a curiinis attitude, upright with the pecially the foot of joint 10 in front ; thoracic 

 distal halfcurled in a spiral. feet pale ; spiracles black ringed ; setae short, 



Stni^e 11. Head rounded, slightly bilobed, black, with enlarged pale tips; tubercles 



with highclvpeus; pale brown ; setae short w-hitish, small; iii before the upper corner 



and still"; width .4 mm. Body long and of the spiracle, iv opposite the lower corner, 



slender, cylindrical, smooth, leet of joint 4 v before, vi below the spiracle subventrally. 



piojecting, cervical shield a little angularly The larvae still rest in a half spiral, 



elevated. All pale biown, not shining, trans- In the brown form the whole dorsum is 



lucent, with live narrow dark brown lines on heavily marked with dark brown, leaving 



the dorsum (dorsal, addorsal and subdorsal). diamond shaped intersegmental marks of 



Setae small, glandular tipped, pale; tubercles pale brown with brown central dots, the 



Colorless, moderate. The food shows green lateral margin of the brown wavy. Region 



and renders the dorsal lines ob.scure. below spiracles pale brown, scarcely mottled. 



Stage III. lle.ad lounded, sordid luteous. Some examples are intermediate between 



two vertical shades composed of brown dots these two forms 



extending up the face of each lobe ; ocelli Larvae from Bellport, Long Island, N.'Y. 



black; width about .7mm. Body translucent. Eggs July :2th, mature larvae August 2nd 



slightly yellowish, green from the food; dor- and imagoes again on August 12th 



sal, .addorsal and subdorsal lines, narrow. The larvae fed on Polygonum and another 



wavy and broken, and traces of a stigmatal common garden weed not determined, 

 line, distinct centrally on the segments; spira- 



