-^ LEPIDOPTERA. 



thoracic ring a yellow, fleshy, Y-shaped scent organ. 

 They feed on various iimbelHferous plants, especially 

 wild parsnip. There are two broods each season. The 

 butterflies of the first brood appear (at Ithaca) during 

 the latter part of May or in June (May 29th, 1875). 

 Those of the second brood appear in July and August. 

 The caterpillars of the second brood transform to 

 chrysalides during the latter part of August (Aug. 26- 

 30, 1 871), and pass the winter in that state. 



Discu.ssion of dimorphism in insects, as illustrated by 

 Papilio Turnus, and black, female variety (P. Glaucus), 

 of trimorphism as shown by P. Ajax (P. Walshii, P.' 

 Telamonides, and P. Marcellus). Walshii is the early 

 spring type, Telamonides the late spring, and Marcel- 

 lus the summer and autumn type. (17, VIII., 257).* 



The genus PicHs includes the cabbage butterflies ; 

 there are several species quite common, and, some- 

 times, they are very noxious. " They are easily rec- 

 ognized by the following characters :— The wings are 

 generally white, with inconspicuous black markings, 

 and occasionally with green or yellow underneath '; 

 they are very. broad and have no scallops or indenta- 

 tions in the margin ; the hind wings in outline resem- 

 ble an egg. The palpi are rather slender, but project 

 beyond the head ; the antennae have a short flattened 

 knob. Their flight is lazy and lumbering. The cat- 

 erpillars are nearly cylindrical, taper a little towards 

 each end, and arc sparingly clothed with a short 



* The following is an interesting example of double dimorphi m in butterflies -—Ljfae 

 ••a vhlacea Edwards is dimorphic, there being females entirely brown (southern) and oth- 

 ers blue with only a brown border (northern) ; very rarely intergr.ades occur in W Va 

 Lycm,m pstud„rpal„s Hoi-, and Lee. is apparently a very distinct species from the above' 

 bu! Mr. Edwards ha< bred L. violncca. which is an insect of early spring, from the last 

 brood of L. fiseudargiolitt. 



