New records of Asian and Australopapuan Cassidinae, with a ...

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LECH BOROWIEC
or trapezoidal, or with anterior margin indistinctly trilobate). Dark form of
Cassida variablis (CHEN et ZIA) with black disc of pronotum and elytra is also
similar but differs in completely yellow ventrites. Cassida flavoscutata SPAETH is
at first glance very similar to C. paiensis but belongs to the species group with
claws simple but appearing distinctly appendiculate due to distally projectling
flanks of the last tarsal segment (in C. paiensis last tarsal segment is not modified,
and claws are simple). Other Oriental species from Cassida circumdata group
with mostly black disc of pronotum and elytra differ in claws with basal tooth.
DESCRIPTION
Length: 4.95-5.6 mm (mean 5.32, n = 12), width: 4.4-5.15 mm (mean 4.75, n
= 12), length of pronotum: 1.9-2.1 mm, width of pronotum: 3.5-3.95 mm, length/
width ratio: 1.09-1.15, width of pronotum/length of pronotum ratio: 1.75-1.95.
Body almost circular (fig. 10).
Pronotum yellow; disc with a large, black spot, occupying almost whole
surface, except margins; the spot is rather square or subtrapezoidal, not as
triangular as in C. dembickyi, margin of the spot more or less distinctly trilobate,
anterior margin in the middle without or with small, yellow cleft. Scutellum black,
or in the middle with very small yellow spot, or yellow with infuscate margins.
Elytral disc black, but the black extending usually only to submarginal row, only
in one of the examined specimens the black in humeral area extending up to
marginal row. Explanate margin yellow. Clypeus from mostly yellow with black
basal corners, to completely black. Thorax black, including lateral plates. Abdomen
mostly black with yellow sides and apex, the yellow margin from as wide as
to slightly wider than width of hind femur. Legs yellow, except black coxae.
Antennae mostly yellow, two to four apical segments more or less infuscate.
Pronotum ellyptical, 1.75-1.95 times wider than long, with maximum width in
the middle, sides narrowly rounded, slightly more narrowly than in C. dembickyi
but less than in C. chiangmaiensis. Disc moderately convex, distinctly bordered
from explanate margin, whole surface of disc with fine punctuation, slightly finer
and sparser than in C. dembickyi, distance between punctures distinctly wider than
puncture diameter. On sides of disc, border between disc and explanate margin
shallowly impressed. Space between punctures smooth and glabrous. Explanate
margin subhorizontal, its surface smooth and glabrous.
Scutellum triangular with transverse sulcus. Base of elytra moderately wider
than pronotum, anterior margin gently arcuate, humeri distinctly protruding anterad,
angulate (fig. 10). Disc moderately, regularly convex with top of convexity in
postscutellar point (fig. 11). Postscutellar impressions distinct, postscutellar point
slightly elevated, forms a well defined H-shaped transverse fold, borders of
postscutellar impressions marked by a slightly elevated arcuate folds which are
connected with transverse postscutellar fold. Posterior branches of the H-shpaed
fold with short transverse folds, but they are not as well defined as in the related C.
probata, and slightly less defined than in C. dembickyi. Principal impressions