Roederiodes, Coquillett, 1901

Sinclair, Bradley J., 2023, Revision of New World species of Roederiodes Coquillett (Diptera: Empididae: Clinocerinae), Zootaxa 5301 (3), pp. 336-364 : 339

Key to New World species of Roederiodes

1 Seven or eight weak dorsocentral setae ( Fig. 10); ocellar and vertical setae weak ( Fig. 10) (only males distinguishable).... 2

- Five strong dorsocentral setae ( Fig. 11); ocellar and vertical setae strong ( Fig. 11).................................. 3

2 Male terminalia with clasping cercus broad and rounded apically ( Fig. 17) [ Arizona, New Mexico]..... R. chillcotti sp. nov .

- Male terminalia with clasping cercus narrow, recurved, with stout apical setae ( Fig. 29) [ Arizona, California, New Mexico]...................................................................................... R. wirthi Chillcott

3 Base of M 2 forming distinct crossvein at apex of cell dm, longer than r-m crossvein ( Fig. 8) [ Colorado, Utah, Manitoba, Northwest Territories]..................................................................... R. distinctus Chillcott

- Base of M 2 forming indistinct crossvein at apex of cell dm, shorter than r-m crossvein or crossvein absent and veins M 1 and M 2 petiolate, coalescing for short distance ( Figs 5, 6, 9)......................................................... 4

4 Antennal stylus 2 times longer than postpedicel ( Fig. 12); upper face brown...................................... 5

- Antennal stylus up to 1.5 times longer than postpedicel ( Fig. 7); upper face with blue pruinescence.................... 7

5 Prescutellar depression with central whitish pruinescent stripe (as in Fig. 14); male terminalia with clasping cercus long and slender anteriorly ( Fig. 24) [ Arizona, Baja California]......................................... R. notialis sp. nov.

- Prescutellar depression without whitish pruinescent stripe (as in Fig. 15); male terminalia with clasping cercus subtriangular ( Fig. 23)............................................................................................ 6

6 Ocellar setae shorter than postpronotal seta; male unknown [Cocos Island, Costa Rica]............... R. wigginsi Wilder

- Ocellar setae longer than postpronotal seta; male terminalia with clasping cercus subtriangular, produced posteriorly ( Fig. 23) [Southern Appalachians, USA].......................................................... R. moultoni sp. nov.

7 Pleura brown to dark brown, with bluish pruinescence ( Figs 5, 6); if pale brown, then prescutellar depression with whitish or bluish pruinescent stripe ( Fig. 14) or hind tibia with distinct ventral setae [North America, north of Arizona]............ 8

- Pleura pale brown, without bluish pruinescence ( Fig. 13) [Arizona, Costa Rica] (females indistinguishable beyond this couplet)............................................................................................... 9

8 Hind tibiae without distinct ventral setae; prescutellar depression with central whitish or bluish pruinescent stripe ( Fig. 14); male terminalia with clasping cercus broad and rounded apically ( Fig. 21)........................ R. junctus Coquillett

- Hind tibiae with distinct ventral setae; prescutellar depression without central pale pruinescent stripe ( Fig. 15); male terminalia with clasping cercus narrow and sickle-shaped ( Fig. 25).................................... R. recurvatus Chillcott

9 Male terminalia with clasping cercus long and slender anteriorly ( Fig. 22) [ Arizona].............. R. lawrencei sp. nov .

- Male terminalia with clasping cercus little prolonged anteriorly ( Figs 16, 18, 19, 30) [ Costa Rica].................... 10

10 Male terminalia with distinctly prolonged anterior and posterior corners of clasping cercus ( Fig. 18) R. costaricensis sp. nov.

- Male terminalia with clasping cercus at most only slightly expanded anteriorly and posteriorly ( Figs 16, 19, 30)......... 11

11 Male terminalia with clasping cercus truncate anteriorly, not projecting ( Fig. 30)..................... R. woodi sp. nov.

- Male terminalia with clasping cercus distinctly projecting anteriorly ( Figs 16, 19)................................. 12

12 Male terminalia with clasping cercus somewhat slender, longer than height of epandrium; posterior margin broadly expanded ( Fig. 19).............................................................................. R. dedota sp. nov.

- Male terminalia with clasping cercus quadrate, not longer than height of epandrium; posterior margin narrowly expanded ( Fig. 16).................................................................................. R. browni sp. nov.