1882.] 105 



a week they could be seen to have grown, and by end of the month 

 very much more grown, and by the middle of December some of them 

 were as long as 6 mm. 



During the winter months I saw but little of them, when from 

 time to time I found it needful to replenish their food in consequence 

 of the large accumulation of frass at the bottom of their residence 

 (resembling coffee-grounds) they having denuded the beans by devour- 

 ing the substance of the pod ; and, moreover, they had already made, 

 and continued to make, any observations on my part very difficulty and 

 of their moulting impracticable, by completely obscuring their sur- 

 roundings with a dense spinning of whitish-grey silk ; and they had 

 lined with silk the little tunnels excavated amongst the refuse. 



By the beginning of April, 1882, they, however, began again to 

 show themselves and were grown considerably, and yet required a 

 further supply of their food, as by this time a prodigious quantity of 

 frass had been made. 



The first specimen of the perfect insect was bred on the last day 

 of April, others followed on the 12th of May, others again on June 

 1st and 4th, and the last on the 1-lth of July. 



The egg of passulella is elliptical in shape with bluntly-rounded 

 ends, and finely pitted surface, whitish at first and soon of a delicate 

 straw-yellow ; tM'o days before hatching it assumes an ochreous tinge, 

 and the next morning a light brown spot appears at one end, and 

 within a few houi*s the larva is hatched. 



At first the young larva is of a whitish-ochreous tint with a brown 

 shining head and very narrow plate across the second segment, and 

 when nearly a mouth old has a faint tinge of reddish, or pinkish- 

 brown, the head very dark brown and the plate still narrow, but at 

 this time Mdth very little more colour than the body. 



At the age of three months the body is of a light brownish-pink 

 colour with reddish-brown head and a blackish-bi'own plate on the 

 second segment, and another on the anal flap, and there is a pinkish- 

 brown dorsal line showing very faintly ; the minute tubercular shining 

 brown dots can be very well discerned. 



"When full-grown the larva measures 10 mm. in length and is of 

 moderately slender proportions, cylindrical though tapering very 

 slightly at each end, the segments having a subdividing wrinkle across 

 the middle of each, and the legs are much under the body ; in colour 

 the head is reddish-brown and glossy, and it has a margin of pale skin 

 in front of the shining black and brown neck-plate, which is dorsally 

 divided with a line of the pallid ground colour of the thoracic seg- 



