1903] DYAK: — \OKTH AMERICAX GEOMETRIDAE I^C> 



LIFE HISTORIES OF NOR PH AMERICAN GEOMETRIDAE.— LI. 



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



Dcilinia litaria Yiw\?X. The specimens before me vary greatly; so much so 

 that I am certain there will ultimately appear a considerable synonymy of this 

 species. But I describe the larvae as D. litarla, as one of my specimens closely 

 matches Hulst's type before me. The female moth is smaller than the male ; 

 both vary greatly in color and markings. 



Egff. Elliptical with dorso-ventral flattening, niicropylar truncation and depression 

 normal, rounded, the truncation sharp and a little oblique. Coarsely quadrangularly reticu- 

 late, the longitudinal lines stronger than the transverse ones, forming apparent ribs, 

 which are irregular, decreasing by confluence towards the ends and on the narrowing of the 

 sides; raised, sharp, the cell areas flat on the bottom. A rather strong line borders the trun- 

 cation which is strongly reticulate. Color pale yellow, turning red. Size .6 X .4 X .3 mm. 



Stage I. Head bilobed, pale testaceous, eye dark, mouth brown. Body slender, loop, 

 ing, vibrant; all pale yellowish, translucent, the food showing green. Verj' faintly indi- 

 cated brown dorsal and subventral bands. Feet pale; tubercles and setae small, invisible, 



Stage II. Head flattened, scarcely bilobed, mouth large, projecting; luteous, eye 

 black, mouth brown ; width about .5 mm. Body moderate, normal, translucent yellowish, 

 the folded incisures more opaque, appearing brighter. Setae short, stiff, black, distinct, 

 from minute tubercles ; no markings. 



Stage III. Head pale green, not shining, epistoma and antennae whitish, setae black; 

 width .7 mm. Body rather slender, green ; broad dorsal and subventral blackish olivaceous 

 shaded bands edged by very faint subdorsal and stigmatal whitish lines. Setae black, short, 

 pointed ; tubercles minute. Feet pale; no shields. 



Stage IV. Head bilobed, the clypeus depressed, oblique; green, setae black; yyidth 

 1.2 mm. Body rather short, slender, sides roughened by coarse annulets. Green, dorsal 

 line obscure, blackish, pulverulent, obscurely geminate, forming heavier dots on the ante- 

 rior edges of segments 7 to 10. Subdorsal line yellowish white, narrow, obscure ; a faint 

 waved lateral line. The tracheal line shows yellowish white. Setae short, black, tubercles 

 invisible; feet green ; no shields. Another larva was brown, all shaded with smoky black- 

 ish, heaviest subventrally ; tubercles black. 



Stage Y. Green form. Head rounded, oblique, ape.x in joint 2; green, sparsely 

 blackish freckled, a faint yellowish shade upon angle of lobe ; epistoma pale, antennae 

 reddish; width 1.6 to 1.8 mm. Body moderate, smooth, bright green ; a distinct white sub- 

 dorsal stripe, crinkled edged, on joints 2 to 13 ; a narrow broken white addorsal line, edg- 

 ing the darker dorsal vessel, with blackish marks on joints 3 and 4 ; traces of a wavy lateral 

 line; feet green ; spiracles faintly reddish, black rimmed ; no subventral marks. Tubercles 

 and setae obscure, dark ; hair dots black. Brotvn form. Head gray, heavily black check- 

 ered. Body gray, black checkered, alternating black lines and quadrate patches, dorsallv 

 and subdorsally ; a partly broken narrow white subdorsal line. Sides with four black lines 

 including a broken white lateral line; substigmatal line white; subventer heavily black 

 shaded. Feet very pale, contrasted ; anal plate and feet greenish. 



Pupation in the ground. Larvae from Kaslo, British Columbia. They fed 

 on Ceanothus. 



