182 
hymenoptera. 
Ceylon and Burma, Ischnogonalos dubia, Magr., in Burma and Lyco- 
gaster rufiventris , Magr., in Burma. 
TUBULIFER A, 
Chrysim:. —Cuckoo Wasps . 
Trochanters one-jointed. Visible abdominal segments usually three. 
This family is most easily recognised by the extremely hard, densely 
punctured integument and the bright metallic green or blue-green 
Fie;. 98— Stilbum cyanuku.m. 
[F. M. H.l 
colouring. They are small insects, with rather small dusky wings. 
The head is of moderate size with large eyes and ocelli; the antennae 
are short, consisting of a longer basal segment (Scape) and a number 
of short joints (flagellum). The 
thorax is large and well developed, 
the abdomen distinct, with usually 
three visible segments, the re¬ 
mainder concealed. The female 
has a long retractile ovipositor. 
The bodily structure is hard, 
designed to enable the insect to 
curl into a ball (fig. 99). So far as 
is known, all are parasitic upon 
Aculeate Hymenoptera and a 
number have been reared from different species. 
99 —Stilbum cyan drum ; curled 
INTO A BALL. [F. M. H.] 
In the greater number 
