Nala, Zacher, 1910

Kočárek, Petr, 2006, A new species of Nala (Dermaptera: Labiduridae) from Cambodia, Acta Entomologica Musei Nationalis Pragae 46, pp. 1-6 : 4-5

Key to males of South-Eastern Asian species of Nala

1 Forceps in basal third to basal half conspicuously dilated internally ( Fig. 8 ). Distribution: Pakistan, India, Nepal, Bhutan, Malaysia. .............................. N. nepalensis (Burr, 1907)

– Forceps long and slender, not dilated in basal half .......................................................... 2

2 Each branch of forceps with large, distally oriented hooked tooth near inner base ( Fig. 7 ). Distribution: Timor. ............................................................... N. timorensis Brindle, 1967

– Forceps without prominent hooked teeth ( Figs. 6, 9-12 ) ................................................. 3

3 Tegmina long, 1.5-2 times as long as pronotum. Wings visible or concealed .................. 4

– Tegmina short, approximately as long as pronotum. Wings entirely concealed. Distribution: Cambodia. ..................................................................................... N. alenae sp. nov.

4 Dark brown species, head black or blackish brown. ........................................................ 5

– Yellowish-brown to pale reddish-brown species (including head). .................................. 6

5 Slender species, forceps twice as long as width of ultimate tergite ( Fig. 6 ). Distribution: Indonesia. ........................................................................ N. tenuicornis (Bormans, 1900)

– Stout species, forceps 1.1 to 1.4 times as long as width of ultimate tergite ( Fig. 11 ). Distribution: Europe, Africa, Asia. ................................................... N. lividipes (Dufour, 1829)

6 Forceps with two pairs of small teeth on inner margin ( Fig. 9 ).... N. ornata Borelli, 1932

– Each branch of forceps with cylindrical tooth (not hooked) on inner margin close to base ( Fig. 10 ), entire inner margin sparsely serrated. Distribution: Afghanistan, Pakistan, Thailand. ...................................................................................... N. basalis Bey-Bienko, 1970

Figures

Figs 6-13. Right branches of forceps in South-East Asian species of Nala Zacher, 1910. 6 – N. tenuicornis (Bormans, 1900); 7 – N. timorensis Brindle, 1967; 8 – N. nepalensis (Burr, 1907); 9 – N. ornata Borelli, 1932; 10 – N. basalis Bey-Bienko, 1970; 11- N. lividipes (Dufour, 1829); 12 – N. alenae sp. nov. Scale bar = 1 mm. Adopted from BRINDLE (1966), BEY-BIENKO (1970), STEINMANN (1989b) and SRIVASTAVA (2003).

Figs 1-5. Nala alenae sp. nov. 1 – habitus of male, dorsal view; 2 – right branch of male forceps, dorsal view; 3 – right branch of female forceps, dorsal view; 4 – subgenital plate of male, dorsal view; 5 – male genitalia, dorsal view. Scale bar = 1 mm.