February, 1901] 



PSYCHE. 



165 



LIFE HISTORIES OF NORTH AMERICAN GEOMETRIDAE. — XIX. 



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



Sentlys ennucleala Guen. The larva given 

 by Guen^e as that of this species does not 

 agree at all with my observations. On the 

 other hand, the one described by Goodell 

 does agree well. As it seemed possible that 

 there had been soine mixture of species, I 

 applied to Dr. Hulst, who states that he 

 thinks the two forms of the moth probably 

 distinct, as follows : — 



1. Wings sordid wliite with faint brown- 

 ish lines — 



ENNUCLEATA Giien., Phal. i. 50:5 ; 1S57. 

 =^res/rictata Walk. C. B. M. xxii, 722; 

 1861 =: meiisiaaia Walk. C. B. M xxxv, 

 162 1 ; 1S66. 



2. Wings with a more or less extensive 

 blackish submarginal powdering — 



.M.ABASTARiA llUbn. Zutr. ii, 22, fig. 

 Tfii. Tfiz.^ enniuleafit \ar. Giien. Phal. 

 pi. 12, fig. ^.^=. eniiiiclea/ii Pack (nee 

 Guen.) Men. 347, pi 10, fig. 67. ■=■>■€■ 

 coiiditaria Walk. C. B. M. xxii, 7S6, 

 1861. 

 The moths bred from the larvae here de- 

 scribed were of the form eitniicleata as de" 

 fined. 



Egg. Laid loosely, rolled about in the 

 tumbler. Roundedly elliptical, one diam- 

 eter less than the other, but without flatten- 

 ed areas, slightly more sharply rounded at 

 the micropylar end; about 15 longitudinal, 

 strongly prominent ribs with fine parallel 

 cross-striae, slightly raised both across the 

 ribs and in the interspaces. Ends confused 

 reticulate, the ribs abruptly ending at the 

 edge of the micropylar end, becoming 

 merged in the reticulations at the other. 

 Very pale green, almost white, not shining. 

 Size .55 X .4 X .35 mm. (Eggs from Wash- 

 ington, D. C.) 



Stage I. Long, slender, thread-like, ac- 



tively looping. Head and cervical shield 

 pale translucent reddish brown, the head 

 round, slightly bilobed, ocelli black; width 

 about .3 mm. Body dark brown above and 

 below ; the sides broadly translucent green- 

 ish. Thoracic feet pale, abdominal ones 

 dark. Setae short and stiff, black, with 

 swollen clearer tips. Later the subventral 

 brown breaks up into a series of subventral 

 streaks. The larvae remain long and 

 slender. 



Stage II. Head round, flattened before, 

 not bilobed; width .4 mm. Body slender, 

 the thorax short; smooth; ground color 

 translucent sordid whitish, thorax with fine 

 dark brown subdorsal line and a broader 

 subventral one ; abdomen with broad dorsal 

 brown band tapering to a point on joint 13, 

 leaving the sides and feet pale ; a moderately 

 broad subventral band, broken posteriorly. 



Stage III. Head round, wider than high, 

 antennae prominent; pale brown, dotted, a 

 white streak on the face of each lobe edged 

 with darker brown dots; width .6 mm. 

 Body long and slender, cylindrical, smooth. 

 Somewhat sordid green ; thorax with a fine 

 dorsal line which joins the broad abdominal 

 dorsal band, reaching joint 3, contracted 

 slightly at the incisures; a series of small 

 round segmental spots subventrally, a line on 

 the anterior edge of the foot of joint 10 and 

 bases of thoracic feet dark purple brown. 

 Setae short and stiff, dark. Skin finely 

 transversely creased. Anal feet long, green. 

 Tubercle i of head and angles of cervical 

 shield a little prominent. 



Stage IV. Head rounded, squarish, dull 

 yellowish, speckled with brown; a bright 

 shade, edged with brown without, on the 

 face of each lobe; width .75 mm. Body- 

 very long and slender, finely annulated, dull 



