ERASTRIA FUSCTJLA. 93 



little ; the head full and round ; fully-developed ventral 

 legs on segments 9 and 10, with rudiments of legs on 

 segment 8 ; in walking it is a semi-looper ; the colour 

 on the back is pale yellow with a broad greenish 

 pulsating dorsal vessel ; the subdorsal is a thin line 

 of clear yellow edged above with brown, and below 

 with greenish ; the round black spiracles placed on a 

 thin reddish line ; anal legs sometimes purplish ; the 

 usual dots on the back blackish ringed with reddish ; 

 the belly yellow, with its dots black. 



Some of the larvse have a more reddish tint, and 

 have every line edged with decided red ; with a 

 brownish stripe between the lower edging of the sub- 

 dorsal and the spiracular line, and below this again a 

 yellow line, then a red line, and the belly dull pale 

 brownish. 



The cocoon is very firmly and neatly made of a thin 

 coating of silk, stuck all over with fine earth or sand, 

 about four lines deep and two wide. Some spun 

 among moss, by larvse which died, were not so close 

 or tough, and were both longer and wider. 



The pupa is about five-sixteenths of an inch long, 

 cylindrical, stoutish about the thorax, the abdomen 

 smaller and short in proportion, ending rather bluntly 

 in a spike set with several curled-topped spines ; the 

 pupa skin very glossy, rich red-brown; the wing- 

 cases more golden-brown ; the eyes blackish. 



By the kind help of the Rev . T. A. Marshall I am 

 able to add that the name of the ichneumon, which 

 was bred about the middle of April from some of the 

 cocoons, is Proteins chrysojphihalmus. A saw-fly larva 

 much resembling that of E. fuscula in colour feeds 

 with it on the same grass, but I have not found out to 

 what species it belongs ; and I shall leave some one 

 else to guess which of the two is the first wearer, and 

 which the mimic, of the colours of their common 

 dress. (J. Hellins, 14th July, 1874; E.M.M., August, 

 1874, XI, 66.) 



