Five new species of Notosacantha Chevrolat (Coleoptera: Chrysomelidae: Cassidinae) from Borneo, with a key to the Bornean species and new faunistic data Author Borowiec, Lech Author Takizawa, Haruo Author Świętojańska, Jolanta text Zootaxa 2013 3608 3 161 177 journal article 10.11646/zootaxa.3608.3.1 fc7293ac-6103-4fc7-bae4-47e923e90898 1175-5326 217290 412D8302-9A59-47F0-956F-C1803BD5E06F Notosacantha flaviventris Borowiec and Takizawa sp. nov. ( Figs 1–3 , 19 , 21–24 ) Etymology. Named after yellowish ventrites. Type material. Holotype : “ Malaysia SABAH/Bot. Gard, Kinabalu/Park, Ranau/ 4.VIII.2007 /H. Takizawa” “H. Takizawa Coll./No. CA 18” (ITPC); paratype : “ Malaysia SABAH/Jin. Kimanis, 26 km to/Keningau, Papar/ 1.VI.2010 /H. Takizawa” (HTM); paratype : “ Malaysia SABAH/Kinabalu Park HQ/Ranau/ 22-23.I.2010 /H. Takizawa” (HTM); paratype : “W SUMATRA: BENGKULU prov./nr. Curup: BUKIT KABA Mt./ 3°29’S 102°36’E ; 1000-1500 m /J. Bezdek leg.; 30.i.-3.ii.2000 ” (DBET). Additional material. Malaysia , Sabah, Kinabalu park Headquarter area, Ranau, Sabah, 4.VIII.2007 , 1 ex. (H. Takizawa). Diagnosis. Notosacantha flaviventris sp. nov. belongs to the group of species with completely reduced dorsal costae and sculpture of elytral disc forming only isolated tubercles and rudiment of lateral costa. The group comprises of the following species: Notosacantha circumdata (Wagener, 1881) , N. clavareaui (Spaeth, 1900) , N. dohertyi (Spaeth, 1913) , N. malaysiana Świętojańska, 2004 , N. moultoni (Spaeth, 1912) , N. obscuricornis sp. nov. , N. odiosa (Boheman, 1856) and N. prominens (Spaeth, 1913) . Notosacantha circumdata and N. moultoni are distinctly larger (length 5.8–7.0 mm) and the dorsum is partly or completely reddish to reddish brown. Notosacantha prominens and N. dohertyi differ in prinicipal tubercle forming rudiment of anterior part of dorsal costa (in N. prominens ) or rudiment of lateral branch joined with rudiment of lateral costa ( N. dohertyi ); both species are separated geographically, distributed in NE India ( N. dohertyi ) or the Andaman Islands ( N. prominens ). Notosacantha clavareaui differs in explanate margin of elytra partly or completely reddish and lateral costa reduced to small tubercle. Notosacantha malaysiana differs in distinctly longer rudiment of humeral costa, principal and apical tubercle joined with slightly elevated interval, and apicolateral part of slope of disc with distinct four tubercles. Notosacantha odiosa and N. obscuricornis closely resemble N. flaviventris . Notosacantha obscuricornis differs in explanate margin of elytra completely black, without reddish extreme margin, and antennae uniformly brown to black. Notosacantha odiosa differs in smaller size (length below 4.2 mm ), slimmer body with maximum width in the middle, and punctures in posterior half of explanate margin of elytra separated by distinct folds. Description. Length: 4.60–6.10 mm , width: 3.80–5.05 mm , length of pronotum: 1.30–1.70 mm , width of pronotum: 3.05–3.95 mm , length/width ratio: 1.11–1.23, width/length ratio of pronotum: 2.18–2.42. Body regularly oval ( Fig. 1 ). Dorsum black, extreme margin of pronotum and elytra reddish ( Fig. 1 ). Interocular space black, frontal plate yellowish red, clypeus yellow to almost black. Ventrites, including legs, yellow. Antennae uniformly yellow or with slightly infuscate club ( Fig. 3 ). Pronotum with regularly rounded sides, widest at base, basal corners angulate, anterior emargination deep, head well visible from above. Disc moderately convex, with distinct transverse median and basal impressions, on top impunctate, on sides with punctate anterior and basal impressions. Base of elytra as wide as base of pronotum. Disc mostly without costae, with isolated tubercles, only lateral and humeral costae form rudimentary, isolated folds. Basal, subbasal, principal and apical tubercles well marked but low, sub-basal and principal tubercles in profile not or only slightly higher than elevated suture ( Figs 2 , 22 ). Costa ultima and furca interna reduced to small tubercles ( Fig. 23 ). Frontal plate broad, extended laterally to half width of eyes, its anterior margin slightly convex with shallow median cleft. Clypeus deeply impressed without median keel but with more or less visible median furrow. Sides of impressed clypeal plate at basal half run close to eyes, then converging in obtuse triangle ( Fig. 19 ). Labrum very shallowly emarginate. Antennae stout, segments 9–10 of club approximately 1.7 times as wide as long, club 0.44 times as long as pedicel (segments 1–7), length ratio of antennal segments: 100:48:52:66:66:55:55:50:43:40:66, segment 3 only slightly longer than segment 2, segment 4 approximately 1.3 times as long as segment 3 ( Figs 3 , 24 ).