1903] DYAR: — XORTH AMERICAN GEOMETRIDAE lOj 



LIFE HISTORIES OF NORTH AMERICAN GEOMETRIDAE.— XLVI. 



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



Hydriomoie muUiferata Walker. 



^SS- Roundediy elliptical, truncation, tiattenings, and depression distinct, liut all 

 rounded; evenly, smoothly reticulate with rather broad, slightly laised lines forming 

 rounded hexagonal cells ; pale yellow. Size .6 X -5 X -4 mm. 



Stage I. Head rounded bilobed, erect, clypeus high and broad ; yellowish whitish with 

 large smoky brown dots on the tubercles; setae dusky. Body elongate and very slender 

 looking, finely annulate, pale yellow ; dorsal and subdorsal purple brown lines, varying in 

 width, streaked on the annulets. The long central segments are double, composed of an 

 elongate small intersegmental portion and a larger central one bearing the setae. On the 

 intersegmental subsegments are traces of an addorsal line which curves outwardly distinctly 

 on joint 11. Broken, streaked lateral, subventral and adventral lines; no shields; setae 

 short, of the shape of bulbs with short stems ; tubercles brown. 



Stage II. Head pale whitish dotted with brown; tubercles blackish; width .5 mm. 

 Body slender, elongate ; green from the food, the lines red brown, pulverulent ; dorsal line 

 straight, addorsal represented by traces, subdorsal and lateral broken, substigmatal nearly 

 continuous, subventral and ventral broken; feet pale; setae short; tubercles minute, 

 obscure. 



Stage III. Head round, full at sides, whitish with black dots on the faces of the 

 lobes; width .9 mm. Body slender, pale green from the food, dorsal line narrow, fluctuat- 

 ing, brown black, divaricate on joint 2, absent on the anal plate ; faint traces of lateral, 

 suprastigmatal, and substigmatal lines on central segments. No siiields ; tubercles concol- 

 orous ; setae short black, capitate. 



Stage IV. Head rounded, slightly elongate, clypeus depressed, oblique; whitish, 

 opaquely translucent, a broad brown shade on the angle of the lobe, the pair converging to 

 the vertex; antennae pale, ocelli black; width 1.4 mm. Body slender, elongate, central 

 segments over twice as long as wide, the intersegmental portion slenderer, ends shrunken, 

 abdominal feet approximate. Soft green, a little white shaded : cervical shield yellowish 

 with brown blotches and from it a broad dorsal band runs backward, rapidly narrowing and 

 vanishing on joint 5 ; a brown dash on joint 12 and 13 anteriorly. A narrow, nearly invis- 

 ible white subdorsal line. Annulet incisures a little clearer. Tubercles obsolete, setae 

 short, dark. Thoracic feet reddish. The dorsal band may run the whole length except on 

 the anterior half of joint 9. 



The larvae formed pendent cocoons of earth attached to a leaf. Standing on 

 a leaf they reached bits of earth which they spun about themselves with a soft 

 web, beginning around the anal feet. The cocoon forms a loose bag of web 

 covered with dirt hanging from the leaf. The fire weed was preferred as a food 

 plant. Larvae from Kaslo, British Columbia. 



