January igoo. J^O I CUE. ' 9 



LIFE HISTORIES OF NORTH AMERICAN GEOMETRIDAE. — VIII. 



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



Calocamfe tindnlata Linn. The larva tubercles also brown and distinct ns on the 



that bears this name in Europe is well bodv; anal plate and anal lei,' plates triangn- 



known, having been frequently described lar, duskv. Tubercle vi absent. The larvae 



and figured. (See Hofmann, Raup. Gross- spun up gregariously a silky web at the tip 



Schmett. Eur., p. 230). The American lar- of a leaf and fed thejein. 



va has been described only by Fitch. Our Stage If. Head rounded bilobed, shin- 

 larva differs decidedly in habit, coloration ing pale yellow; width .5 mm. Body trans- 

 and food plant from the European one, so lucent yellowish, tubercles large, black; a 

 that it hardly seems as if they could be the broad, shaded, subdorsal black band and a 

 same species. Newman says the European faint, narrower dorsal one. Shields and feet 

 moth lays the eggs singly, or at least never pale; setae moderate, dusky, 

 adjoining each other, and the larvae are not Stage III. Head round, full, slightly bi- 

 decidedly gregarious and Hofmann does not lobed, shining reddish orange; width i.i 

 contradict this. The European larva has a mm. (Calculated should be .9 mm.) Body 

 brown head and is gray below, brown above, thick, short, a little flattened; pale green 

 faintly lined with black, the dorsal line finely with dorsal, addorsal and subdorsal broad, 

 edged with whitish and with a whitish stig- straight black lines with only narrow spaces 

 matal line. The food plant is willow. The between, the subdorsal broadest and edged 

 following description will show how our lar- with whitish below. Tubercle.s and spira- 

 va differs: — cles black; cervical shield pale centrally. 



Eggs. Laid in a pile, nine square and black at the sides ; anal plate and large leg- 

 four layers deep, the upper layers composed shield black; setae short, pale, 

 of less eggs than the lower and consequently Stage IV. Heaii as before, shining red- 

 smaller, but on one side all the layers are dish orange; width 1.5 mm. Body as be- 

 equal. Elliptical, strongly flattened above fore, the dorsal and addorsal lines black, 

 and below and a little so on the sides by their narrow interspaces forming pulveru- 

 mutual pressure, the ends rounded, the one lent yellowish white lines on the broad dark 

 toward the tapering side of the pile a little dorsum; subdorsal line reaches tubercle iii 

 depressed, none truncate; reticulations flat- and is edged below by a suprastigmatal, nar- 

 tened, not raised, the egg indistinctly a row, yellovvi.^h line. Subventer dull yellow- 

 many-sided polygon; reticulations whitish, ish with faint, pale, subventral line and 

 not very distinct. Color green, then pink- rings about tubercles vii. Feet and venter 

 ish yellow, finally gray before hatching; pale, spiracles black ringed; anal plate and 

 size .6 X .4 X .3 mm. large anal leg-shields deep black; cervical 



Stage I. Head pale yellow, ocelli black; shield red like the head, black on the lateral 



round, slightly bilobed, no marks; width 3 margin--; tubercle-* black, moderate; setae 



mm. Body somewhat robust, not elongate, rather long, fine, pale. 



feet normal ; ocherous yellow, all the tuber- The larvae live till maturity gregariously 



cles distinct and broadly dark brown, large, within the leaves which they spin together 



bearing dark, swollen-tipped setae. Cervi- and eat oft" the upper epidermis and paren- 



cal shield not cornified, concolorous, the chynia. Whole shoots may be thus spun up 



