Machilontus Silvestri, 1912

Song, Zhi-Shun, Huang, Fu-Sheng & Liang, Ai-Ping, 2011, Machilontus (s. str.) medogensis Song & Huang, sp. nov. from Tibet, the northernmost record of the genus Machilontus Silvestri, 1912 and the first record of the family Meinertellidae (Insecta: Microcoryphia: Machiloidea) in China, Zootaxa 2822, pp. 61-68 : 63-64

Key to the species of genus Machilontus Silvestri

Paclt (1969) erected Machilontus sutteri borneensis as a subspecies of M. sutteri based on a single male specimen from Borneo, with 1+1 coxal vesicles on the coxosternite I. Mendes (1989) suggested the character was a generic one instead of specific one and the subspecies needed to be more carefully redescribed. Sturm & Bach (1988) provided a provisional key for 7 species in two subgenera of Machilontus , excluding M. sutteri borneensis for their incomplete descriptions. We herein provide a key to all known Machilontus species (also excluding M. sutteri borneensis ) based on modification of Sturm & Bach’s key (1988).

1 Eyes longer than wide, with ratio of length to width over 1.2; dorsal apophysis of article II of male maxillary palps with a well separated cylindrical base...................................................... M. (Megalopsobius) convergens

- Eyes wider than long; dorsal apophysis of article II of male maxillary palps without well separated cylindrical base........ 2

2 Article I of maxillary palps with outer apophysis short, about two thirds as long as maximum diameter of article I............................................................................................... M. (s. str.) gravelyi

- Article I of maxillary palps with outer apophysis relatively elongate, nearly equal to or longer than maximum diameter of article I................................................................................................ 3

3 Ventral side of fore tibiae with characteristic setal field absent or only slightly developed............. M. (s. str.) javanicus

- Ventral side of fore tibiae with a characteristic setal field of numerous brownish bristles.............................. 4

4 Frons with a Y- or V-shaped symmetrical pigmented stripe..................................................... 5

- Frons without symmetrical pigmented stripe............................................................... 12

5 Frons with a Y-shaped stripe; median portion of frons protruded and with many short blackish bristles.... M. (s. str.) lerang

- Frons with a V-shaped pigmented stripe.................................................................... 6

6 Clypeus with a characteristic field of numerous brownish bristles below median ocellus.............................. 7

- Clypeus with characteristic field absent or only slightly developed below median ocellus............................. 9

7 Tarsomeres II of all three pairs of legs with a typical scopula at apex........................... M. (s. str.) scopuliferus

- Tarsomeres II of all three pairs of legs without scopula at apex.................................................. 8

8 Dorsal apophysis of article II of male maxillary palps strongly incurved.......................... M. (s. str.) montanus

- Dorsal apophysis of article II of male maxillary palps directed inward, not incurved............... M. (s. str.) medogensis

9 All coxae and trochanters with distinct spots of hypodermal pigment........................... M. (s. str.) sumatranus

- All coxae and trochanters without distinct spots of hypodermal pigment......................................... 10

10 Frons with a pair of large triangular pigmented spots between paired ocelli; coxosternites II with some setae near inner apex...................................................................................... M. (s. str.) martensi

- Frons with a pairs of slender and elongate pigmented spots between paired ocelli; coxosternites II without setae near inner apex............................................................................................... 11

11 Dorsal apophysis of article II of male maxillary palps distinctly short and small...................... M. (s. str.) riedeli

- Dorsal apophysis of article II of male maxillary palps distinctly long and large.................... M. (s. str.) sulawensis

12 Dorsal apophysis of article II of male maxillary palps with numerous minute denticulations at apex....... M. (s. str.) yoshii

- Dorsal apophysis of article II of male maxillary palps apically smooth........................................... 13

13 Legs without well defined pigmented spots................................................. M. (s. str.) lawrencei

- Legs with well limited pigment spots at least on femora and tibiae.................................. M. (s. str.) sutteri