152 SIREX SP. 
dark metallic green-black and clothed with hair, which is dense 
on the dorsal surface of the thorax; antennz bristle-like, 
22-jointed, a little over 4rd length of insect, the first five 
joints being chestnut brown, the other 17 joints black; the first 
joint is thickened and longer than the others. Legs long, chest- 
nut brown in colour except the posterior tibiz and tst tarsal joint, 
which are black and very much flattened out, Anterior tibia 
is armed at its base with a spur. These tibiz and tarsal joints 
are doubtless used to push out wood-dust from the galleries as 
the insect moves forward in its boring operations. The tarsi 
terminate in a pair of curved sharp claws, which are spined at 
their junction. Wings membranous with a rich coppery sheen ; 
they reach to the end of the insect, leaving only the portion of 
the body bearing the short augur uncovered. In the upper 
wing there are two marginal cells, the lower one of which does 
not reach the end of the wing, and three submarginal cells. 
The middle portion of the wing is occupied by six cells, none of 
which reach the outer edge, the two centre ones of which are 
the smallest. There are three veins on the lower marginal 
edge, the one nearest the outer edge being the smallest. Under 
surface of thorax black-green. Body is flattened, shining and 
smooth ; first three segments of abdomen metallic green, shad- 
ing off laterally on the third into red, the following four dark 
metallic red with a dash of yellow in it, the lower edge of the 
fourth being ultramarine blue, the seventh a pale ultramarine 
brown and the last ultramarine. These last two segments glow 
brilliantly when they catch the light. Each of the red segments 
has on the posterior edge of its dorsal surface a spot of ultra- 
marine. Under surface of abdomen same as upper, except that 
both the last segments are a brilliant metallic ultramarine. 
Length just under 13th inches, (Described from a living 
specimens see-F]. Vib wigat.c.) 
¢. Head and thorax a deep metallic green above, beneath 
clothed with hair asin ¢, Legs chestnut brown, except coxze 
and trochanters which are dark metallic blue, and last tarsal 
joint and claws, which are black; posterior tibia and 1st tarsal 
joint not thickened. Wings with a rich old gold metallic 
lustre with thick wellemarked black veins. The wings leave the 

