Agriculture Reference
In-Depth Information
Fig. 146
Forewing of a wood-wasp - family
Siricidae.
EXAMPLE:
Neurotoma saltuum
(social pear
sawfly).
Superfamily
SIRICOIDEA
Fig. 147
Hind end of a sawfly larva - family
Cephidae: (a) dorsal view; (b) left lateral view.
Fore tibiae with either just one apical spur or
with the second very small.
usually occurring in a transparent cocoon within
the larval gallery.
EXAMPLE:
Cephus pygmeus
2. Family SIRICIDAE (wood-wasps)
(wheat
stem
Large, often conspicuously coloured insects; ovi-
positor very strong, projecting back horizontally
in repose, as if a formidable sting; Rs vein of
forewing recurved
(Fig. 146).
Larvae are wood-
borers. This family includes various species of
economic importance to the timber trade, in-
cluding
Urocerus gigas
(giant wood-wasp), but
none of agricultural significance.
sawfly).
Superfamily
TENTHREDINOIDEA
Fore tibiae with two apical spurs; cenchri pre-
sent; ovipositor saw-like. Larvae usually with
three pairs of thoracic legs and six to eight pairs
of abdominal prolegs; prolegs without crochets
(cf. Lepidoptera). Larvae entirely phytophagous,
including many free-living species and leaf
miners, usually pupating in silken cocoons.
Superfamily
CEPHOIDEA
Fore tibiae with one apical spur; cenchri absent;
abdomen constricted between the first and sec-
ond segments.
4. Family ARGIDAE
(p. 247)
Medium-sized, stout-bodied, slow-moving saw-
flies; antennae with three segments
(Fig. 148a),
the third long and often bifid; forewings without
cross-vein 2r (cf. Fig. 149); cenchri particularly
large. Larvae with six to eight pairs of abdominal
prolegs.
EXAMPLE:
Arge ochropus
(large rose sawfly).
3. Family CEPHIDAE (stem sawflies)
(p. 246
et seq.)
A small group of relatively small, mainly black,
yellow-banded, slender-bodied sawflies with
long, thread-like (filiform) antennae. Larvae
apodous but with three pairs of small, leg-like
thoracic tubercles; ocelli vestigial; metathoracic
spiracles well developed; subanal appendages
present but vestigial; abdomen terminating in a
fleshy protuberance above the anus
(Fig. 147).
Larvae bore within shoots or stems, pupation
5. Family CIMBICIDAE
Relatively small to large, stout-bodied, fast-
flying sawflies;
antennae
strongly
clubbed
