THE INSECTS OF MAY. 



197 



237. Hessian Fly. 



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

 (Cecidomyfa tritici), which attacks the wheat in the ear, and 

 which transforms an inch deep beneath the surface. 



Among the butterflies which appear this month are the Tur- 

 nip-butterfly (Pontia oleracea, Fig. 238,) which lays its eggs the 

 last of the month. The 

 eggs hatch in a week or 

 ten days, and in about two 

 weeks the larva changes 

 to a chrysalis. Thanaos 

 junevalis and T. Brizo fly 

 late in May. The cater- 

 pillars live on the pea 

 and other papilionaceous 

 plants. Thecla Auburni- 

 ana, T. Niphon, and other 

 species fly in dry, sunny 

 fields, some in April. Ar- 

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

 second brood appears hi August and September. Vanessa 

 J-album and V. interrogations appear in May, and again in 

 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 feods on 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 Butterfly. May 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 Tineids 

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



