THE INSl'X'TS OF MAY. 



197 



237. Hessian Fly. 



the maggots live.) The same may be said of the Wheat midge 

 (Cecidomyia tritici), which attacks the wheat in the eai', and 

 which transforms an inch de'^p beneath the surface. 



Among the butterflies which appear this mouth are the Tur- 

 uip-butterfly (Foutia okiracea, Fig. 238,) which lays its eggs the 

 last of the mouth. The 

 eggs hatch iu a week or 

 ten days, and iu about two 

 weeks the larva changes 

 to a chrysalis. Thauaos 

 junevalis and T. Brizo fly 

 late in May. The cater- 

 pillars live on the pea 

 and other papilionaceous 

 plants. Thecla Auburui- 

 ana, T. Niphon, and other 

 species fly iu dry, sunny 

 fields, some iu April. Ar- 

 gynuis Myrina flies from the last of May through June, and a 

 second brood appears iu August and September. Vanessa 

 J-album and V. interrogationis appear iu May, and again iu 

 August and September. The caterpillars of the latter species 

 live on the elm, lime and hop-vine. Grapta comma also feeds 



on the hop. Alypia 8-mac- 

 ulata (Fig. 49) flies at this 

 time, and in August its 

 larva feeds ou the grape. 

 Sphinx gordius, S. 5-macu- 

 lata (Fig. 239) and other 

 Sphinges and Sesia (the 

 Clear-winged moth), 

 appear the last of May. 

 Arctia Arge, A. virgo, A. 

 phalerata and other spe- 

 cies fly from the last of 

 238. Turnip Bnttevlly. -^^^ through the summer. 



Hyphantria textor, the Fall-weaver, is found in May or June. 

 The moth of the Salt-marsh caterpillar appears at this time, 

 and various Cut worms (Agrotis, Fig. 240) abound, hiding in 

 the daytime under stones and sticks, etc., while various Tincids 

 and Tortrices, or Leaf-rolling caterpillars, begin to devour teu- 



