Machilontus Silvestri, 1912

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