549 



larger eud, varnisliod. From fifteen to I'orty eggs are laid al a lime, during 

 tlu' night only ; tliey are deposited about one hundred in one spot, in eurving 

 sometimes angulated rows, whieli have the appearanee somewhat of radiating 

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

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

 28tli or 29th the greater part appeared gray, which effect was caused l)y 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. Sohk; oI" 

 the larva; lived until July 7th. Head several times larger than llic prothorax, 

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

 legs, tw-o 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 l>ody. 

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

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



Tetracis trianguliferata Packard. Plate 13, fig. GO. 



Tetr/wh tiia)igidiffrata Pack., Proc. Bost. Soc. Nat. Hist., xiii, 3H4, 1H71. 



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

 from the preceding, as the male antennse are pectinated, the jjalpi are remark- 

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

 callata in the head being a little suudler, and the froni sliglilly narrower, 

 while the antennas are well pectinated, the pectinatit)ns liciiig 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 tlu're are other slight differences, 

 I he venation (jf T. crocallata and /orala In-ing almost identical. The wings 



