336 



FSYCHE. 



[April, 1902 



LIFE HISTORIES OF NORTH AMERICAN GEOMETRI DAE. —XXXI. 



BY HARRISON G. DYAR, WASHINGTON, D. C. 



Orthofidoiiia vestaliata Guen. 



Egg. Elliptical, strongly flattened con- 

 cave, one end considerably depressed, the 

 other rounded bluntly, scarcely truncate. 

 Pale 3'ellow, shining; perfectly smooth, no 

 sculpturing. Size .7 X -5 X .3 mm. Turned 

 partly red before hatching. 



Stage I. Head rounded, shining yellowish 

 luteous, ocelli black. Body cylindrical nor- 

 mal, moderate, entirely smooth; pale yellow, 

 not shining; shields undifferentiated, un- 

 marked; feet moderate, normal. Later be- 

 came all shining pale green, translucent, the 

 food showing green in spots. 



Stage II. Head rounded, yellowish luteous 

 as before; width, .4 mm. Body the same 

 shining translucent yellowish, the food green, 

 irregularly- spotted. Tubercles minute, dark, 

 setae short. Segments slightly annulate. 



Stage III. Head rounded, slightly bilobed, 

 obliquely erect, clypeus high; pale "yellow, 

 not shfTiing, mouth brown, eye black; width, 

 .6 mm. Body normal, moderate; shining 

 translucent pale green, appearing bright 

 green from the food, immaculate. Tracheal 

 line fine, white. Tubercles dark but very 

 small. Setae small, black, pointed. Thorax 

 and joints 10-13 slightly wrinkled annulate, 

 5 to 9 a little drawn out and smooth. 



Stage IV. Head round, Hattish before. 



rather wide, clypeus sunken; green, not shin- 

 ing; width, 1.05 mm. Body moderate, nor- 

 mal, green, the incisures narrowly folded 

 whitish, tracheal line white ; setae short, 

 rather stiff, dark, from invisible tubercles. 

 The larva is translucent, not transparent; no 

 marks. 



Stage V. Head round. Hat before, nearly 

 erect; green, a line of brown dots starts at the 

 base of the clypeus and runs up to vertex of 

 lobe then curves inward and downward 

 shortly; ocelli black, mouth brown; width, 

 1.6 mm. Bodv moderate, unifoi'm, not taper- 

 ing, cylindrical, normal; segments weakly 

 6-annulate. Smooth, rather shining translu- 

 cent green, a whitish dorsal and a subdorsal 

 line shaded between them and below- with 

 darker green; feet green; anal plate rounded, 

 equalling the weakly shielded anal feet; 

 shields membranous. Subventral fold rather 

 brightly shaded in a faint paler tint. Dorsal 

 stripe fainter and broader than the subdorsal 

 one. Pupation in the ground. 



Food plant. The larvae were fed on wild 

 cherry. 



Moths common early in Jiuie in the more 

 densely wooded gulches in the lower foot hills 

 of the Rocky Mountains near Denver, Colo- 

 rado. Eggs June 7th, mature larvae, July ist. 

 Apparently single brooded. 



SMITH & SONS, 146-148 WILLIAM ST., New York. 



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