Agriculture Reference
In-Depth Information
pseudopod
Fig.
75 Larva of a leaf beetle,
Leptinotarsa
decemlineata
- family Chrysomelidae (x7).
Fig.
74 A flea beetle,
Psylliodes attenuata
subfamily Halticinae (x20).
21. Family CHRYSOMELIDAE
(leaf beetles)
(p. 138
et seq.)
Small to medium-sized, generally rounded.
often brightly coloured or metallic-looking bee-
tles; third segment of tarsi often noticeable ex-
panded and hiding the minute (and often
overlooked) fourth segment; hindlegs sometimes
enlarged and adapted for jumping (as in flea bee-
tles: subfamily Halticinae)
(Fig.
74). Larvae
eruciform, usually with well-developed thoracic
legs and, often, with noticeable plate-like verru-
cae on the thoracic and abdominal segments;
anal segment often with a pseudopod
(Fig.
75).
Most species are leaf-feeders as both adults and
larvae but several species have stem-boring or
root-feeding larvae.
EXAMPLES:
Cassidinae -
Cassida
spp. (tortoise
beetles); Criocerinae -
Crioceris asparagi
(asparagus beetle); Galerucinae -
Galerucella
luteola
(elm leaf beetle); Halticinae -
Aphthona euphorbiae
(large flax flea beetle).
Fig.
76 Head of a weevil larva - family
Curculionidae.
mouthparts and from which arise the antennae;
antennae clubbed and often geniculate; includes
many brightly coloured species. Larvae apodous;
body usually C-shaped, with a well-defined
head, strong mandibles
(Fig.
76) and, often,
a somewhat hump-backed appearance
(Fig.
77).
22. Family ATTELABIDAE
(leaf-rolling weevils)
(p. 150
et seq.)
Superfamily CURCULIONOIDEA
(weevils)
Small to medium-sized weevils with a distinct
rostrum; antennae not geniculate and without an
elongated scape, all segments being of similar
length
(Fig. 78a).
A
major group of phytophagous insects,
with front of head forming a more or less
elongated snout (the rostrum) which bears the
