Megachile (Chelostomoda)

Niu, Ze-Qing, Wu, Yan-Ru & Zhu, Chao-Dong, 2012, A review of Megachile (Chelostomoda) Michener (Megachilidae: Megachilini) known from China with the description of a new species, Zootaxa 3267, pp. 55-64 : 56

Key to the Chinese species of Megachile (Chelostomoda)

(Modified from the key by Wu (2006), female of Megachile spissula unknown)

1. Females (antenna with 10 flagellomeres).................................................................. 2

-. Males (antenna with 11 flagellomeres).................................................................... 5

2. Clypeal median lobe with two setal tufts ( Figs 6 , 22 )......................................................... 3

-. Clypeal median lobe with four setal tufts ( Fig. 23 )........................................................... 4

3. T1–T5 with white apical hair bands, hair bands not narrowed medially............................... M. (C.) spissula

-. T1–T5 with white apical hair bands, but the bands on T1–T3 narrower medially............. M. (C.) guangxiense sp. nov.

4. Postgradular grooves on T2–T3 deep; scopa yellowish; S6 glabrous................................... M. (C.) ulrica

-. Postgradular grooves on T2–T3 shallow; scopa white; S6 with short black hairs.................... M. (C.) nigroapicalis

5. Hind legs obviously modified, hind femora and tibiae swollen, tarsomeres 1–4 strip-liked, fifth tarsomere round clubbed, two times as long as tarsomeres 1–4 together ( Fig. 28 ); S1 with median projected lobe ( Fig. 24 ) M. (C.) crabipedes

-. Hind legs not modified; S1 flat, without a conspicuous median lobe ( Fig. 25 )...................................... 6

6. Antenna short, only extending to apex of scutellum.......................................................... 7

-. Antenna long, extending to propodeum................................................................... 8

7. First antennal flagellomere slightly broader than long, less than half as long as second ( Fig. 14 )...................................................................................................... M. (C.) guangxiense sp. nov.

-. First antennal flagellomere nearly as broad as long, half the length of the second ( Fig. 29 )............... M. (C.) spissula

8. Mandible black, with three acute teeth, interspaces between teeth narrow ( Fig. 30 ); outer surface of front tibia reddish-brown; hind distitarsus black ( Fig. 32 ) M. (C.) nigroapicalis

-. Mandible brownish-black, with three blunt teeth, interspaces between teeth broad ( Fig. 31 ); outer surface of front tibia blackish-brown; hind distitarsus brown ( Fig. 33 ).................................................. M. (C.) ulrica

Figures

FIGURES 1 – 10. Megachile (Chelostomoda) guangxiense sp. nov. Holotype, Ƥ, 1, Body in dorsal view; 2, Body in lateral view; 3, Head in frontal view; 4, Head in lateral view; 5, Antenna in lateral view; 6, Clypeus and mandible in frontal view, showing the setae-tuft on clypeal median lobe and teeth on mandible; 7, Mesoscutum and scutellum in dorsal view; 8, Metasoma in lateral view, showing the apical hair bands on terga; 9, Metasoma in lateral view, showing the T 6; 10, Hind tarsus in later view, showing the claw.

FIGURES 22 – 28. Characters of Chinese Megachile (Chelostomoda) species. 22, M. (C.) spissula female clypeus in frontal view, showing setae-tufts on clypeal median lobe; 23, M. (C.) ulrica female clypeus in frontal view, showing setae-tufts on clypeal median lobe; 24, M. (C.) crabipedes male metasoma in ventral view, showing horned lobe on S 1; 25, M. (C.) nigroapicalis male metasoma in ventral view; 26, M. (C.) crabipedes male fore tarsus; 27, M. (C.) crabipedes male middle tarsus; 28, M. (C.) crabipedes male hind leg.

FIGURES 11 – 21. Megachile (Chelostomoda) guangxiense sp. nov. Allotype, 3, 11, Body in dorsal view; 12, Body in lateral view; 13, Head in frontal view; 14, Antenna in lateral view; 15, Outer surface of fore tarsus; 16, Inner surface of fore tarsus, showing the black spots; 17, Claw on distitarsus of middle leg; 18, Metasoma in dorsal view, showing the postgradular groove on T 2 and T 3; 19, T 6 in dorsal view, showing the apical margin; 20, T 6 in ventral view, showing the carina; 21, Metasoma in ventral view, showing the exposed S 1, S 2 and T 6.

FIGURES 29 – 38. Characters of Chinese Megachile (Chelostomoda) species. 29, M. (C.) spissula male antenna in lateral view; 30, M. (C.) nigroapicalis male mandible in frontal view, showing the teeth and interspaces among teeth; 31, M. (C.) ulrica male mandible in frontal view, showing the teeth and interspaces among teeth; 32, M. (C.) nigroapicalis male hind tarsus, showing color of distitarsus; 33, M. (C.) ulrica male hind tarsus, showing color of distitarsus; 34, M. (C.) crabipedes male genitalia line drawing, from Wu (2006); 35, M. (C.) spissula male genitalia line drawing, from Wu (2006); 36, M. (C.) ulrica male genitalia line drawing, from Wu (2006); 37, M. (C.) guangxiense sp. nov. male genitalia in dorsal view; 38, M. (C.) guangxiense sp. nov. male genitalia line drawing.