238 The Philippine Journal of Science • 1917 



The larva is one of the commonest of the arctiids in Tokyo 

 and is to be met with in May and June on many kinds of low- 

 growing herbs and shrubs. It is closely allied to the larva of 

 Diacrisia infernalis Butl. The pupa is inclosed in a loose-webbed 

 cocoon, spun in leaves of the food plant. 



Matsumura ^' records the life history of this species and gives 

 figures of the imago, male and female; the ova; the larva; and 

 the pupa. He says that in Hokkaido the species is single- 

 brooded. The larva hibernates after the second molt, on or near 

 the food plant, until the spring of the following year. The imago 

 emerges at the end of July. The female imago covers the ova, 

 which are approximately two hundred in number, with hairs 

 from the anal tuft. It is possible that this species is double- 

 brooded in southern Honshu. 



The eggs are laid in a patch covered by the brownish wool from the 

 abdomen of the female moth. 



The larvae resemble those of Arsilonche albovenosa in color, being black 

 with yellow spots and red warts. The hairs are black and white, rather 

 thin and do not obscure the body coloration. Head rounded, bilobed, flat 

 before, shining black, paraclypeus reddish, epistoma and bases of antennse 

 white. Body cylindrical, normal, with large, elevated, bright-red wartg. 

 Wart i is small, ii, iii, and v large, iv absent, vi large, black, base of leg 

 broadly hairy. On the thorax, two warts above the stigmatal wart, normal. 

 Cervical shield densely hairy. Black; a dorsal yellow line, broken into two 

 spots on each segment; fine yellow dottings to a narrow broken subdorsal 

 line; sides more heavily dotted to a waved broken substigmatal line. Feet 

 reddish with black shields. 



The cocoon is composed of hair and thin silk. The pupa has the usual 

 Arctian shape." 



The above description of the larva appears to have been taken 

 from preserved specimens. Dyar does not mention the metallic 

 blue described by Miyake. 



Larva. Purplish fuscous, with hairs of greyish white and grejdsh black; 

 head and legs greyish fuscous; a dorsal and subdorsal series of greyish 

 yellow spots; tubercles mostly ochraceous brown, some of 6-12 somites 

 metallic blue; prothoracic shield metallic blue. 



Food-plants: mulberry-, peach-, pear-, plum-, cherry-, apple-tree and 

 many others." 



Imago. — Diacrisia imparilis Butl. and D. infernalis Butl. are 

 closely allied to each other in the larval and the imaginal stages. 

 The male imagoes of both species are blackish brown, and the 



"Japanese Injurious Insects (Nichon Gaichuhen) (1899), 29. 

 "Dyar, Proc. U. S. Nat. Mus. (1905), 28, 944, fig. 6, larva. 



17 



Miyake, Bull. Coll. Agr., Tokyo Imp. Univ. (1909), 8, 167. 



