LIBRARY

RAPHIDIODEA 396
SUMMARY OF ANATOMICAL CHARACTERS-Continued
External - Adults
Labial palpi - three-segmented.
Mandibles - small, with three or four
teeth.
'l'hol'ax - Prothorax - longer or shorter
than head, slender and neck-like.
Meso- and metathorax - both shorter
than wide.
Legs - slender, first pair attached at
base of prothorax. Tarsi live-segmented,
third segment enlarged and
flattened, fourth very small.
Wings - two pairs; similar in shape and
venation; hind pair somewhat smaller;
pterostigma large.
Spiracles - two pairs.
Abdomen - ten-segmented.
Genitalia - male abdomen terminating
in a hood-shaped epiproct and a pair
of harpagones. Female with long
slender ovipositor.
Spiracles - eight pairs.
lnternol- Adults
Very little known
Alimentary System. Long food sac at posterior
end of crop.
Salivary glands - a pair of tubes extending
half the length of the body.
Mid-intestine - large.
Malpighian tubes - well developed; six
in number, four attached at their tips
to colon.
This remarkable group of insects has long been placed in the order NEU­
ROPTERA, largely because of the general type of wing venation, and has only
The European raphidian, Raphidia rotze/)urgi Brauer. (photographed from Robert,
1936.)
within recent years been given order rank. It constitutes a relatively small
group comprising five genera and approximately 60 species. Concerning the
distribution Carpenter (1936) states;