1875.] 105 



On turning over one of the two remaining cases on May 12tli, I 

 •was surprised to see the larva walk immediately out of it as though in 

 alarm, and after crawling over the duckw^eed on the surface of the water, 

 partly ascend the side of the glass ; it seemed to be full-grown, so I 

 placed it in a shallow saucer of water, and secured a couple of figures 

 and the following description. 



Length just five-eighths of an inch, or a little more when stretched 

 out to the utmost, in which position it appeared nearly uniform in size 

 throught)ut, but its more usual appearance while at rest or crawling 

 "Was to be thickest in the middle of the body, the first five segments 

 tapering towards the head, which is partly retractile into the second 

 segment ; the second segment is longer than the usual proportion, 

 Avhilc the third and fourth are shorter than the others ; the thickest 

 segments are the si^^th to the tenth ; from the latter the figure tapers 

 again to the thirteenth, wliich is the smallest segment, its former knob 

 not present ; the divisions and sub-divisions all deeply defined, the 

 anal tip rounded and but little sloped ; the anterior legs very well 

 developed ; the ventral ones full and fleshy, but with small feet ; the 

 anal pair rather small ; the back, viewed sideways, a little arched, 

 sloping off towards the head, and more to the anal extremity. 



Tlie colour of the head is pale olive-brown, darkest at the moutb, 

 and shining ; the very lustrous black plate on the second segment is 

 relieved behind by a pale margin of olive-greenish ; from thence the 

 whole surface of the body is of a deep sooty-olive blackness, soft and 

 velvety, with the slight exception of the anal tip being a little browner 

 than the rest, and rather less velvety ; a black dorsal stripe can just 

 be discerned ; the anterior legs pale olive ; the puffed spiracular region 

 is a little puckered, and the small circular blackish spiracles i-aised in 

 the least degree above the surrounding surface, and slightly glistening; 

 a few fine soft haii's from the usual situations just visible. 



As before, this larva, when supplied with a little duckweed, soon 

 fdiiucd for itself a new ease ; on examining the case of the other 

 survivor, I found it had already become a pupa; I put them in tlio 

 same vessel together, and, on May 15th, I found the larva was joining 

 its case to that which contained the pupa, thus making together a 

 much bigger o1)ject floating on the water ; at intervals more we('d was 

 added by the larva until the ITtli, Avhen it became quiescent, and then 

 the whole mass presented an oval form of about the bulk of a house- 

 sparrow's egg. 



Not expecting an imago qxiite so early, T left the water uncovered 



