Diptera, , 1758

Freitas-Silva, Rafael A. P. & Ale-Rocha, Rosaly, 2019, New South American species of Crossopalpus Bigot (Diptera: Hybotidae: Tachydromiinae), including biogeographical insights and a reinterpretation of female abdominal tergite 10 in Drapetidini, Zootaxa 4559 (1), pp. 111-135: 112-113

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https://doi.org/10.11646/zootaxa.4559.1.4

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lsid:zoobank.org:pub:F2186E8E-E924-4259-AD0D-3AE5FE55C6DA

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Diptera
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Key for identification of South American species of Crossopalpus Bigot ( Diptera  , Hybotidae  , Tachydromiinae  )

1 Scutum not densely bristled, with only few acrostichal (acr) and dorsocentral (dc) bristles ( Figs 24, 26, 30View FIGURES 23–30). Fore and mid tibiae yellow ( Figs 23, 25, 29View FIGURES 23–30)............................................................................... 2

- Scutum densely bristled, bearing several rows of acr and dc bristles ( Figs 16, 18View FIGURES 16–19, 28View FIGURES 23–30). At least fore or mid tibiae darkened ( Figs 10View FIGURES 10–11, 16, 17View FIGURES 16–19, 27View FIGURES 23–30), reddish-yellow to brown................................................................... 4

2 Frons and vertex with patch of white tomentum ( Fig. 24View FIGURES 23–30). Antennae black, postpedicel concolorous with preceding segments ( Figs 23, 24View FIGURES 23–30). Femora concolorous, yellow ( Figs 23–24View FIGURES 23–30). Shorter species, about 1 mm ............... C. albivertex  sp. nov.

- Frons and vertex without patch of white tomentum ( Figs 26, 30View FIGURES 23–30). Antennae dark brown to yellow, postpedicel lighter in color than preceding segments ( Figs 26, 29, 30View FIGURES 23–30). Hind femur darker than fore and mid femora ( Figs 25, 29View FIGURES 23–30). Longer species, about 2 mm ............................................................................................... 3

3 Palpus ( Fig. 29View FIGURES 23–30) and abdomen yellow ( Figs 29, 30View FIGURES 23–30). Hind tibia darkened ( Fig. 29View FIGURES 23–30). Wing milky, with no infuscation, second costal section 2/3 length of third costal section ( Fig. 35View FIGURES 31–35).................................... C. xanthogaster  sp. nov.

- Palpus dark brown ( Fig. 25View FIGURES 23–30), abdomen pale brown ( Figs 25, 26View FIGURES 23–30). Tibiae concolorous, yellow ( Fig. 25View FIGURES 23–30). Wing slightly brown infuscate near base, second costal section about as long as third costal section ( Fig. 32View FIGURES 31–35)............... C. aliceae  sp. nov.

4 Palpus yellow ( Figs 10View FIGURES 10–11, 17View FIGURES 16–19). Fore and mid femora with brown to reddish-brown extensive markings, hind femur black ( Figs 10View FIGURES 10–11, 16, 17View FIGURES 16–19). Wing hyaline, lacking infuscation, venation pale brown to brown ( Figs 16, 17View FIGURES 16–19)........................... 5

- Palpus somewhat darkened, brownish-yellow. Fore and mid femora brownish-yellow, hind femur brownish-yellow with brown infuscation on apical 2/3 ( Figs 27, 28View FIGURES 23–30). Wing brown infuscate, venation dark brown to black ( Fig. 34View FIGURES 31–35)... C. goliathus  sp. nov.

5 Head lacking tomentum on upper 1/2 of postocular area. Fore tibia yellow ( Fig. 10View FIGURES 10–11). Hind femur slender ( Fig. 10View FIGURES 10–11), bearing 2 subapical anteroventral setae. Vein R 4+5 only slightly arched, M 1 slightly bowed, initially divergent from each other and convergent near apex ( Fig. 33View FIGURES 31–35)............................................................ C. armipes ( Bezzi, 1909) 

- Head tomentose on upper 1/2 of postocular area ( Fig. 16View FIGURES 16–19). Fore tibia brownish-yellow ( Fig. 17View FIGURES 16–19). Hind femur strongly swollen ( Figs 16, 17View FIGURES 16–19), bearing 1 subapical anteroventral strong seta. Both veins R 4+5 and M 1 strongly arched, parallel throughout ( Figs 16, 17View FIGURES 16–19).................................................................... C. pennescens ( Melander, 1918)