194 PSYCHE [Oct.— Dec. 



LIFE HISTORIES OF NORTH AMERICAN GEOMETRIDAE.— XLVH. 



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



Hydriomene excurjiata Grote. 



Egg- Elliptical, flattened, depression well marked, cuneiform from side view, the other 

 end rounded, scarcely truncate; reticulations irregularly hexagonal, neat, distinct, moder- 

 ately broad, low raised, cell areas flat. Pale yellow, shining. Size .8 X -6 X -5 mm. Laid 

 singly, adherent. 



Stage I. Head rounded, sordid smoky shaded, pale at the mouth, the eye black, promi- 

 nent. Body moderate, normal, sordid gray from within, dark granular on a whitish ground; 

 no marks; no shields; tubercles small, but the setae distinct, rather long with swollen, club- 

 shaped tips. 



Stage II. Head strongly bilobed, thickly mottled with dark brown, the paler ground 

 color hardly showing, ocelli black ; width .4 mm. Body moderate, normal, sordid luteous, 

 obliquely striped in dark brown ; the stripes start in an intersegmental dorsal patch, edged by 

 whitish, run obliquely forward to join a submacular subventral zigzag shade; a geminate 

 ventral band. Setae dark with clear swollen tips. Ordinary lines obsolete, a pale geminate 

 dorsal and subdorsal indicated. 



Stage III. Head strongly bilobed, thickly mottled in dark brown with a pale streak on 

 the apex of each lobe; width .6 mm. Bodj' moderate, the segments annulate, tubercles 

 elevated, setae short and pale with swollen tips. Pale luteous, heavily obliquely striped with 

 blackish brown, starting from strong intersegmental spots, forward and downward, joining, 

 or nearly so, a series of reversed subventral stripes. An adventral shaded band and slight 

 narrow dorsal and subdorsal ones. Thoracic feet brown ; abdominal ones pale on the out- 

 side. 



Stage IV. Head rounded, bent downward, gray black with a bright white streak before 

 the apex of each lobe and another above the eyes ; width .95 mm. Body moderate, thicker 

 behind, the segments a little widened on the subventral fold, finely annulate ; latticed in 

 dark brown and pale yellow; a narrow dorsal brown line in a brownish yellow ground, 

 enclosed by a series of diamond-shaped brown marks, shaded and obscure toward the thorax, 

 on joints 1 1 and 12 represented by only the posterior half of the marking; a series of broad 

 lateral shades run obliquelj' posteriorly and shade into a broad, adventral dark brown band. 

 Tubercles pale, hair dots dark; setae short, dark, capitate, the tubercles somewhat elevated. 

 No shields. 



Stage V. Head rounded bilobed, rather sharph- so, sordid gray brown, an obscure pale 

 streak on the vertex of the lobe; width 1.2 mm. Body thick, robust, stick-like, straight, the 

 thorax a little smaller, the segments irregularly annulate, skin finely granular. Anterior 

 half of larva darkly shaded, the posterior half light yellowish dorsally ; oblique black brown 

 lines as before, obscured anteriorly, joining a subdorsal blackish waved line; a dorsal line, 

 slightly broken intersegmentally, then obsolete, on joints 11 and 12 the marking represented 

 only by subdorsal dots. Venter dark, leaving a pale ventral line. Tubercles sinall, slightly 

 elevated; setae short, black, subcapitate. A broad, bright, pale yellow bar on joint 2 sub- 

 dorsally. Feet of joint 10 light outwardly. 



