Miridiba, Gao & Idrees & Li, 2022

Gao, Chuan-Bu, Idrees, Atif & Li, Jun, 2022, The Miridiba lamellata Species Group (Coleoptera: Scarabaeidae) with a New Species from Yunnan, China, The Coleopterists Bulletin 76 (1), pp. 101-109 : 107

KEY TO SPECIES GROUPS OF MIRIDIBA

1. Antenna with 9 antennomeres ..................... 2

1ʹ. Antenna with 10 antennomeres ................... 3

2. Epipleura with long, dense setae from base to apex ( Fig. 29 ). .......... M. cILIATIpEnnIs group

2ʹ. Epipleura without setae, or with very short setae .......................... M. TRIchophoRA group

3. Dorsal surface of pronotum with punctures sparsely distributed, distance between punctures greater than one puncture diameter .... 4

3ʹ. Dorsal surface of pronotum densely punctate, distance between punctures equal to or less than one puncture diameter ........................ 6

4. Metacoxa with dense, white scales; inner sides of two ventral branches of parameres joined and formed into a tubular structure ................ .................................. M. BoRnEEnsIs group

4ʹ. Metacoxa with yellow pubescence; inner sides of two ventral branches of parameres separated ....................................................................... 5

5. Dorsointernal margin of metatibia with two spines; parameres bilaterally symmetrical, dorsal branches divided into three parts ..... .......................................... M. gREssITTI group

5ʹ. Dorsointernal margin of metatibia without spines, or with only tiny and obtuse spines; parameres bilaterally asymmetrical ........................................... M. scuTATA group

6. Dorsal surface of pronotum rough and wrinkled, punctures strong and deep ( Fig. 30 ) ..... ................................... M. RugATIcoLLIs group

6ʹ. Dorsal surface of pronotum smooth, punctures superficial ..................................................... 7

7. Elytra with four flat strips (longitudinal costae) ............................................................. 8

7ʹ. Elytra without longitudinal costae, or only longitudinal costa IV ................................... 9

8. Inner dorsal margin of metatibia without spines, or with only tiny spines ( Fig. 31 ); parameres with 2 ventral branches longer than dorsal branches ….......… M. LEucophThALmA group

8ʹ. Inner dorsal branches of metatibia with 2–3 small, sharp spines; parameres with 3 branches ....................................... M. BIDEnTATA group

9. Dorsal and ventral branches of parameres entirely or partially fused; dorsal surface of parameres with a membranous basal area ..... ....................................... M. sInEnsIs group

9ʹ. Parameres with all branches lamella shaped ....................................... M. lamellata group

Figures

Figs. 28–31. Pronotum, elytra, and leg of four Miridiba species. 28) Pronotum of M. lamellata; 29) Elytra of Miridiba ciliatipennis (Moser, 1913); 30) Pronotum of Miridiba rugaticollis (Moser, 1913); 31) Metatibia of Miridiba dohrni (Brenske, 1894) (M. leucophthalma species group). Abbreviations: ts, tiny spine. Scale bars = 1 mm.