552 LECH BOROWIEC C. dembickyi n. sp. <strong>and</strong> C. paiensis n. sp. C. subprobata differs distinctly in yellow abdomen, <strong>with</strong> only the first sternite <strong>with</strong> black margins or spots (in C. chiangmaiensis abdomen in middle is black). C. mroczkowskii differs in sparse 15-19. Cassida chiangmaiensis: 15 – dorsal, 16 – lateral, 17 – head <strong>and</strong> prosternum, 18 – antenna, 19 – claw
NEW RECORDS OF ASIATIC AND AUSTRALOPAPUAN CASSIDINAE 553 punctuation <strong>of</strong> elytral sides <strong>with</strong> distance between punctures partly as wide as to slightly wider than puncture diameter (in C. chiangmaiensis punctuation is dense, punctures almost touching each other). C. paiensis <strong>and</strong> C. probata differ in infuscate last three to four antennal segments (in C. chiangmaiensis antennae are uniformly yellow, or only apex <strong>of</strong> the last segment is slightly infuscate). C. dembickyi is the most similar, especially in its uniformly yellow antennae, but differs in smaller size (length 4.6-4.95 mm, in chiangmaiensis 5.25-5.5 mm), narrowly rounded pronotal sides (in chiangmaiensis angulate), black on elytra in humeral area extending up to marginal row (only to submarginal row in C. chiangmaiensis), <strong>and</strong> abdomen narrowly margined by yellow (in C. chiangmaiensis broadly margined). Dark form <strong>of</strong> Cassida variablis (CHEN et ZIA) <strong>with</strong> black disc <strong>of</strong> pronotum <strong>and</strong> elytra is also similar but differs in completely yellow ventrites. Cassida flavoscutata SPAETH is at first glance very similar to C. chiangmaiensis but belongs to the species group <strong>with</strong> claws simple but appearing distinctly appendiculate due to distally projectling flanks <strong>of</strong> the last segment <strong>of</strong> tarsi (in C. chiangmaiensis last segment <strong>of</strong> tarsi is not modified, <strong>and</strong> claws are simple). Other Oriental species <strong>of</strong> Cassida circumdata group <strong>with</strong> mostly black disc <strong>of</strong> pronotum <strong>and</strong> elytra differ in claws <strong>with</strong> basal tooth. DESCRIPTION Length: 5.25-5.5 mm (mean 5.38, n = 2), width: 4.65-4.8 mm (mean 4.73, n = 2), length <strong>of</strong> pronotum: 1.9-2.0 mm, width <strong>of</strong> pronotum: 3.7-3.8 mm, length/wdith ratio: 1.13-1.15, width <strong>of</strong> pronotum/length <strong>of</strong> pronotum ratio: 1.90-1.95. Body almost circular (fig. 15). Pronotum yellow; disc <strong>with</strong> a large, subtriangular black spot, occupying almost whole surface, anterior margin <strong>of</strong> the spot slightly undulated but not trilobate. Scutellum black, or black <strong>with</strong> yellow apex. Elytral disc mostly black, black extending only to submarginal row. In one <strong>of</strong> the two examined specimens at base <strong>of</strong> interval 3, in 1/2 <strong>and</strong> 2/3 length <strong>of</strong> interval 2, <strong>and</strong> 1/3 length <strong>of</strong> interval 4 there are very small yellow spots. Explanate margin yellow. Clypeus mostly yellow <strong>with</strong> black basal corners. Thorax black, including lateral plates. Abdomen in middle black yellow on sides <strong>and</strong> apically, the yellow margin twice wider than width <strong>of</strong> hind femur. Legs yellow, except black coxae. Antennae yellow, only apex <strong>of</strong> last segment indistinctly infuscate. Pronotum ellyptical, 1.90-1.95 times wider than long, <strong>with</strong> maximum width in the middle, sides narrowly rounded, the most narrowed in the group. Disc moderately convex, distinctly bordered from explanate margin, whole surface <strong>of</strong> disc <strong>with</strong> fine punctuation, slightly coarser <strong>and</strong> denser than in C. dembickyi <strong>and</strong> C. paiensis, distance between punctures wider than puncture diameter. On sides <strong>of</strong> disc, border between disc <strong>and</strong> explanate margin shallowly impressed. Space between punctures smooth <strong>and</strong> glabrous, or in middle microreticulate <strong>and</strong> slightly dull. Explanate margin subhorizontal, its surface smooth <strong>and</strong> glabrous.
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