Lema (Quasilema) trivittata trivittata Say 1824

United States and southern Canada, Taiwan (new record), and Japan (Ryukyu: Miyako and Iriomote islands). A key to 11 known species of Lema from Taiwan was presented by Kimoto and Takizawa (1997). Of these species, Lema postrema Bates, 1866 is a junior synonym of Lema fortunei Baly, 1859 (Schmitt 2010); Lema coromandeliana (Fabricius, 1798) is a junior synonym of Lema praeusta (Fabricius, 1792) (Warchałowski 2011). 1 Elytron without scutellar row of punctures (subgenus Petauristes) 2 – Elytron with a short scutellar row of punctures (subgenus Lema) 7 2 Elytron blackish-blue 3 – Elytron yellowish-brown 5 3 Entire elytron blackish-blue 4 – Lateral margin of elytra yellow, with transverse yellow band at middle Lema solani Fabricius 4 Generally reddish-brown except antenna black Lema fortunei Bates – Generally black except head and prothorax reddish-brown Lema honorata Baly 5 Entire elytra yellowish Lema pectoralis Baly – Elytra with black spots or stripes 6 6 Elytra with three black, longitudinal stripes Lema trivittata trivittata Say – Elytra with large, black spots at base and subapex; in some specimens entire elytra black except apex Lema koshunensis Chûjô 7 Mesotibia with a distinct denticulation in middle Lema coronata Baly – Mesotibia without distinct denticulation 8 8 Pronotum with two transverse furrows at basal ½ Lema praeusta (Fabricius) – Pronotum with one transverse furrow at basal ½ 9 9 Generally blackish-blue 10 – Generally yellowish-brown 12 10 Pronotum without punctures Lema cyanea Fabricius – Pronotum with punctures 11 11 Abdominal ventrites III-V yellowish-brown, vertex relatively flat Lema concinnipennis Baly – Abdominal ventrites blackish-blue, vertex swollen Lema cyanella (Linneaus) 12 Middle and hind legs black except front femur reddish-brown 13 – All legs yellowish-brown 14 13 Body longer (7.5–8.2 mm), abdominal ventrites I-V black (Fig. 2) Lema diversipes Pic – Body shorter (4.5–5.5mm), abdominal ventrites II-V reddish-brown (Fig. 4) Lema lacertosa Lacordaire 14 Elytron with basal and postmedian black spots Lema esakii Chûjô – Entire elytron yellowish-brown 15 15 Elytron with transverse furrow behind humerus; vertex without pubescence Lema rufotestacea Clark – Elytron without transverse furrow; vertex with dense pubescence Lema coomani Pic