134 PHRAGMAT^IOIA ARUNDINIS. 



sent me the eggs mentioned at p. 58. I found them 

 about 1*5 mm. long, and about 0*8 mm. wide, the shell 

 thin and smooth, rather iridescent. I did not attempt 

 to rear the larvae, but attached the cluster of eggs to a 

 plant of Arundo the next time I was by the waterside, 

 and, perhaps, may have set up a new colony. Mr. H. 

 Doubleday sent me some pupae in June, 1860, from 

 which I bred the moths in the second and third weeks 

 of July. I have the pieces of reed still with his blue 

 ink mark pointing out the orifice in each from which 

 the moth would escape. In 1886 Mr. Gr. T. Porritt 

 sent me two larvae of very unequal size, one being 

 almost thrice as long as the other, on May 21st; 

 and on May 28th Mr. W. H. B. Fletcher sent me a 

 dozen larvae of various sizes, some apparently quite 

 full grown, but I was not lucky enough to get any of 

 them into the pupa, although they seemed lively and 

 moved from one piece of reed to another. Mr. 

 Fletcher tells me the larva must live for two years at 

 least as an internal feeder in the lower parts of the 

 Arundo stems, in fact underground ; the change to the 

 pupa seems to take place higher up, but the pupa is 

 active and moves up and down the hollow reed stems ; 

 the larva prepares for the emergence of the moth by 

 gnawing a thin spot in the side of the stem, and then 

 lining it with a thin web of silk very much of the 

 same colour ; it also stops up the hollow of the reed 

 just above with a diaphragm of whitish silk mixed with 

 raspings of the reed ; the pupa forces more than half 

 its length out at the prepared orifice, and when the 

 moth emerges the empty skin is left there sticking. 



I described fully a larva 26 mm. long, and examined 

 another 10 mm. long, and another 40 mm. ; in figure 

 they were all alike, and differed only in their lighter or 

 darker colouring. Length of the one described 26 mm., 

 figure slender, somewhat flattened, of nearly uniform 

 bulk throughout, the thirteenth segment long and taper- 

 ing ; the head horny, flattened, but with rounded out- 

 line, a horny shield all across the second segment swell- 



