1912] Barnes and McDunnough — Geometrid Species 17 



thickly sprinkled with whitish or light brown granules, with black dorsal line and 

 traces of creamy subdorsal stripes. Dorsally on abdominal segments II, III and 

 IV, a pair of conical protuberances, tipped with creamy, those of III uniting to form 

 a large single wart; on these segments the lateral tubercles are also prominent 

 and heavily marked with cream-color, sustaining the appearance of the white trans- 

 verse bands of the previous stage. Beneath darker than above. Length 4 mm. 



At rest the larva assumes a curved position similar to a question mark, with the 

 head just removed from the twig or leaf, and when disturbed will keep up a 

 swaying motion from side to side for a considerable length of time. 

 Stage III. 



Very similar to previous stage; dorsal tubercles all conical, small, except those of 

 2d, 3d, 4th and 8th abdominal segments, that of III being largest, single, formed 

 by junction of two dorsal tubercles. Slightly waved subdorsal and lateral lines, 

 and a much waved spiracular line which forms oblique stripes on abdominal segments 

 2-6, extending upwards as far as the lateral line; a dorsal dark line formed by the 

 lack of white granulations on this portion of the body; lateral warts of II, III and 

 IV abdominal all more or less tinged with creamy. Beneath with medio- and sub- 

 ventral lines. Length 6.3 mm. 

 Full grown {Stage V?). 



Head and body reddish-brown to deep brown, granulate in appearance; body 

 cylindrical, thoracic segments rather swollen; tubercles I of abdominal segment 

 III unite to form a conical wart, inclined rather towards rear, and bifid at its apex; 

 tubercles of segments II, IV and VIII small, conical, separate, but larger in compari- 

 son than the same tubercles of the remaining segments; all other tubercles minute. 

 An indistinct dark dorsal stripe, and an irregular subdorsal one, bordered laterally 

 with yellowish and tending to form V shaped marks on central abdominal segments, 

 the apex of the V pointing backwards; in dark colored specimens these markings 

 are almost obsolete. A light yellow spiracular stripe, straight on the thoracic 

 segments, indistinct on first abdominal, broken and forming 5 oblique upwardly 

 inclined stripes on the following segments, lacking on rear segments; these oblique 

 pale stripes are bordered dorsally with blackish shades, the last of which continues 

 as a lateral dark stripe to the anal segment. Beneath as above with a broad dark 

 sub ventral stripe. Spiracles pale, rimmed with black. Length 20 mm. 



Food plant, Aster. 



Ectropis crepuscularia D. & S. 



The early stages of this species are doubtless well known in 

 Europe. We know of no account of the life history of the American 

 form. It may prove interesting for the sake of comparison. 



Ovum. Pale green, smooth, oval, laid in batches under slight covering of wool. 

 Hatches in 7 days. 

 Stage I. 



Black with a double row of white dorsal spots, consisting of two on anterior and 

 two on posterior portion of each segment, and a broad irregular white lateral stripe. 

 In later stages the larva turns dull purplish-brown. Length 2 mm. 



