Insects. 0473 



contained the larva, which was twice as long as the cocoon, and 

 apparently even broader. Lyonet says that after the last monlt they 

 had pale blue heads, in which the black eyes appeared as little points. 

 I did not observe this, and it may have escaped me ; but it is also 

 possible that immediately after the last change of skin, the larvae have 

 blue heads, which nevertheless become black again some time after- 

 wards. The cocoons were elliptic, very hard and pergaraentaceous, 

 black, but entirely covered with grains of sand firmly attached to 

 them. According to Lyonet and Bouche, the imagos are developed 

 as early as April. It may probably have been owing to the very 

 cold spring of 1861 that our imagos did not appear until May, 

 M. Wttewaal sent me a sawfly in the first or second week in May, 

 which he had reared ; but as, relying on the determination by Bouche, 

 I was expecting to receive Athalia fuliginosa I was soraevvat surprised 

 at getting a wasp with long Cladius-like antennae. I immediately 

 opened one of my cocoons, in the hope of being able to make a 

 drawing of a pupa, in which I succeeded. The little pupa which 

 I found was nine millimetres long ; the head, back, sides and anus 

 yellowish white ; the ventral surface greenish ; eyes black, and the 

 folded antennae, legs and wings, glassy white : from the margins of the 

 saw and ovipositor it appeared to be a female. 



M. Wttewaal succeeded in rearing some others : perhaps ray having 

 disturbed the sand in searching for the cocoons had had some injurious 

 effect on the contained insects, — at all events, all I succeeded in 

 rearing was one individual in a crumpled condition, but which was 

 nevertheless sufficient to fix the identity of the species. 



The female imago of this species is from eight to nine millimetres 

 long, and expands to eighteen millimetres. The general colour is a 

 very dark bluish black, with the exception of the cenchri, which are 

 bluish gray, and also of the knees and inner sides of the two anterior 

 tibiae, which are brownish. The wings also, although iridescent, are 

 black, the tint being darker at the insertion and paler towards the 

 margin ; the stigma is obscure brown. 



The antennae of this insect are nearly as long as the body ; they 

 contain nine joints, the first two of which are very small, the 

 remainder being of nearly equal length, the whole covered with an 

 extremely short and fine recumbent pubescence. The antenna of the 

 male are also provided on the inner and under sides with two rows of 

 longer silky hairs (fig. 8), precisely as is the case in the genus Cladius. 

 The head is somewhat more hirsute in the male than in the female ; 

 in both the clypeus is straight, not notched. The shining brown upper 

 VOL. XXIII. N 



