Mav, 



PSYCHE. 



203 



Small spines 

 uf same. 



3^ 



2S 



40 



The scales on white thorn were found 

 August 18, 1898, upon the large branch- 

 es. Those on Spiraea, June 15, 1897, 

 upon the trunk and limbs. The scales 

 on Coliseum ivy, Sept. 30, 1899. Those 

 in the woods, June 16, 1899, on the large 

 branches, on dogwood, June 10, i8g8, 

 were on the trunk, on maple at Chicago, 

 111., August 10, igoo, and those on 

 meadow sweet, June 25, 1897, on all 

 parts of this small plant. It cannot be 

 said that these forms are only occasion- 

 al, or at all local, neither tliat they are 

 found on a particular plant, and in such 

 a position as not to get a full supply of 

 nourishment ; moreover I do not re- 



member that the years in which tliey 

 were found were exceptional. For con- 

 venience and also for future reference, 

 I have prepared a separate table of these 

 small forms marked. K. The characters 

 to be observed in the determination of 

 the species are ; 



Antennae S-joiiUed, 3 and 4 longest: ^ 

 always longer than 6 or 7 (the length of the 

 fifth joint is very important) which are vari- 

 able in length, although often equal and 

 always the shortest. The short spine-like 

 hairs of tlie first joint normally three, but 

 often only two will be seen. The short spine- 

 like hairf. on the outer margin in front of 

 the large blunt spines are also present with 

 the long thin hairs between the antennae, and 

 above the anal plates. The color and size of 

 the scales counts for nothing, as there is 

 every gradation in color from a light red- 

 brown to almost clear black. And it should 

 be said that the length of the first joint is 

 only approximative, as in only a few instanc- 

 es can a specimen be mounted that will show 

 this joint perfectly. 



LIFE HISTORIES OF NORTH AMERICAN GEOMETRIDAE.— XXII. 



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



Sciagt'uphiti heliotJiidata Guenee. Accord- 

 ing to Dr. llulst this species has the follow- 

 ing synonvmv: ocelliuata Guen., restoraia 

 Walk., subcolumhata Walk., dnplicala Pack. 

 The larva has not been previously described. 



Egg. Elliptical, well flattened above and 

 below, one end slightly depressed, the other 

 rounded truncate and a little swollen. Shin- 

 ing dark grass-green, almost olive color. 

 Densely, finely reticulate, the cell areas con- 

 cave, and, on the micropylar end, becoming 

 large and strongly concave, look like the 

 markings on a thimble, w hich is the cause of 



this end looking swollen. Size .6 X .4 X .3 

 mm. Later turned dull dark red with cen- 

 tral dark green nucleus. Hatched in five 

 days. 



Stage I. Head rounded, slightlv bilobed, 

 brownish luteous, ocelli black; held 

 obliquely erect; width about .3 mm. Bodv 

 moderate or rather thick, the incisures dis- 

 tinct ; feet normal, |)ale. Uniformly sordid 

 velvety olivaceous tinted, the tubercles 

 rather large, slightly elevated, duskv. 

 obsciu'e. Dorsum and venter shaded, some- 

 what darker than the sides; no marks c.\- 



