28 THE ENTOMOLOGIST. 



have observed the same in the case of CI. albipes and 

 CI. uncinatus. 



The length of time passed by the insect within the cocoon 

 depends upon the time of year in which the larva spins up ; 

 when this takes place in the spring or summer the period of 

 inclusion is not longer than a fortnight or three weeks; but 

 when the larva spins up in September the imago does not 

 appear until the following spring. One larva, which spun up 

 on the 23rd of May, produced the imago on the 14th of 

 June ; and from full-grown larvae, taken on the 3rd of 

 August, I obtained three images by the middle of the month, 

 all males. 



On cuiting open one of these cocoons— a little before the 

 time the imago is ready to appear, that is to say on the six- 

 teenth or seventeenth day — the pupa is found to be fully, or 

 very nearly fully, coloured, having the appearance of our 

 fig. 5, which represents a pupa so nearly ready to come out 

 that it begins to move about the antennae and the palpi, and 

 the last joints of the tarsi. When this drawing was made the 

 insect was already black, with obscure white legs, and a gray 

 stripe on the side, being the membrane between the dorsal 

 and ventral plates. BruUe found the imagos develope in 

 thirteen days, during the month of July. 



The perfect insects (see figs. 6 and 7) are black; the legs 

 being partly obscurely white, or pale ochreous. The males 

 are four or five millemetres long; the females from five to 

 seven millemetres. Head nearly as broad as the thorax, 

 shining black, scantily clothed with very short gray hairs ; in 

 both sexes the palpi are obscure white. Thorax black, with 

 scanty gray pubescence ; sometimes, in the female, with a tint 

 of very dark sepia. Cenchri obscure white. Abdomen 

 shining black. Legs shining black as far as the knee, and 

 from there dirty white, or, in some males, pale ochre-yellow ; 

 the last three joints of the posterior tarsi, sometimes all, 

 together with the point of the tibiae, sordid brown. The 

 wings, for more than the half of their extent from the base, 

 are smoke-coloured, with brown nervures. Costa obscure 

 while, or pale reddish brown. Stigma of the same colour, or 

 faded brown. The antennae are a little longer than the head 

 and thorax, black, and of a very peculiar form in the male 

 (Hartig's figure, plate 2, f. 20, is not quite exact; see our 



