pee 
a 
Life History of Tetropium gabrielr. 195 
been buried in a stump in the earth soon after hatching, and had 
remained so for six months. 
Colour white, pinkish white, or dirty white, according to food- 
supply. White before moulting, when it has evacuated all back 
food and ceased temporarily to feed, or when excavating wood. 
Yellowish prior to transforming to a pupa. 
Long. 10-24 mm, 
The newly-hatched larva is 1-1} mm. long, subparallel, 
the prothoracic segment being slightly the widest. 
The most striking character at this early stage is that 
of the legs which are produced into long seta, bent 
inwards and slightly hooked at the tip, very soft and 
flexible (Plate XX, fig. 3). These would possibly give 
the larva a better hold on the surface of the bark, always 
slightly sticky from the presence of exuded resin, until it 
enters it by its burrow. These setz are exchanged, at 
the first moult, for the usual short terminal claw. The 
body is sparingly clothed with long sete, which are 
shortened at the first moult. 
The larva moves with almost the same facility as the more active 
newly-hatched Lepidopterous larvee, as I have observed in Rhagium, 
and as is possibly the case with all Longicorn larvez of similar habits 
of life. I have seen it climb up and down bark or the surface of glass 
perpendicularly without falling. 
At this stage there is no sign of the corneous tubercles which are 
present in the mature larva on the dorsal surface of the last segment, 
but, from the egg, slight fleshy prominences take their place. 
On the first moult the larva assumes its final shape, 
becoming considerably wider in front. Directly after the 
moult the head stands out prominently (Plate IV, fig. @), 
but, in a few hours, it is for the most part withdrawn into 
the prothoracic segment and under the scutum, giving the 
larva, especially when full fed, the appearance of having 
a very small head for so destructive a work. 
It does not call for further notice till after the 3rd moult, when 
signs of the corneous tubercles appear. This is a useful character, 
distinguishing it from its near ally Asemwm and from Criocephalus, 
in both which the abdomen terminates in two spines, as has been 
pointed out by Dr. D. Sharp (“The Genus Criocephalus,” Trans. 
Ent. Soc. Lond., May 20th, 1905). 
The newly-hatched larva at once makes its way into the tender 
