549 



larger end, varnished. From fifteen to forty eggs are laid at a time, during 

 the night only ; they are deposited about one hundred in one spot, in curving 

 sometimes angulated rows, which have'the appearance somewhat of radiating 

 from a common centre. When first laid they were yellowish -green ; on the 

 20th they had become ochro-olivaceous ; on the 21st indian red, and by the 

 28th or 29th the greater part appeared gray, which effect was caused by innu- 

 merable minute black atoms on a whitish ground. On the 31st they were all 

 a deep though rather dull purple. Hatched on the 30th and 31st. Some of 

 the larvse lived until July 7th. Head several times larger than the prothorax, 

 ochraceous, luteous, sub-globose ; anal segment much enlarged, white ; prop- 

 legs, two pairs, white. The enormous head and anal segments gave these 

 caterpillars the appearance of minute, animated dumb bells. Above, fuligin- 

 ous ; stigmatical line, white ; beneath, pale red. They were very active, 

 almost constantly in motion. Each time before looping, it rears itself up on 

 its hind legs, and turns round in every direction, as if scrutinizing the neigh- 

 borhood. I tried in vain to rear them, experimenting with almost every food 

 plant I could think of."— (C. S. Minot, Can. Ent., ii, 28.) 



Pupa. — Of the usual shape, with the anal spine large and acute. Gray, 

 spotted and speckled with reddish-brown. A double row of dorsal spots. 

 Head and thorax dark brown ; wings spotted like the rest of the body. 

 Length, 0.62 inch. "From a dark geometric larva found feeding on the 

 sumach in the spring. Imago late in May." — (Saunders.) 



Tetracis trianguxiferata Packard. Plate 13, fig. 60. 



Tetrads trianguliferata Pack., Proc. Bost. Soc. Nat. Hist., xiii, 384, 1871. 



1 <$ and 1 9 . — This species belongs to a distinct section of the genus 

 from the preceding, as the male antennae are pectinated, the palpi are remark- 

 ably long, and the venation is different. It differs from T. lorata and cro- 

 callata in the head being a little smaller, and the front slightly narrower, 

 while the antennae are well pectinated, the pectinations being slender and 

 rather long. The palpi are moderately long, ascending and reaching a little 

 beyond the front, and usually pointed. The hind femur is slender, not swollen 

 much ; the costa is much wider, so that the subcostal venules are shorter and 

 thrown off at a much greater angle ; the lozenge-shaped subcostal cell is small, 

 one-half smaller than in crocallata, and there are other slight: differences, 

 the venation of T. crocallata and lorata being almost identical. The wings 



