Hydrellia

Júnior, Francisco De Assis Rodrigues, Mathis, Wayne Nielsen & Couri, Márcia Souto, 2014, Hydrellia Robineau-Desvoidy (Diptera: Ephydridae) from Brazil with an emphasis on the faunas from the states of Parana and Rio de Janeiro, Zootaxa 3753 (6), pp. 501-541 : 504

Key to species of Hydrellia from Brazil

1. Maxillary palpus dark brown to black (fig. 4.3).............................................................. 2

- Maxillary palpus yellow to orange yellow (fig. 20.4).......................................................... 4

2. All fronto-orbital setae proclinate; notum with metallic blue reflections............................ H. calverti Cresson

- Anterior fronto-orbital setae proclinate, posterior reclinate; notum with metallic green reflections...................... 3

3. Pleurae, except for notopleuron, silvery gray contrasting with opaque brown notum and notopleuron; mid and hind basitarsomeres orange yellow...................................................................... H. agitator Deonier

- Pleurae opaque grayish brown, not contrasting with notum; mid and hind basitarsomeres dark brown to black (fig. 4.3)............................................................................................ H. tibialis Cresson

4. Ocellar setae absent; frontal vitta, notopleuron and adjacent area of supra-alar, katepisternum and scutellum densely microtomentose, appearing velvety reddish brown to black (fig. 4.6).................................................. 5

- Ocellar setae present; frontal vitta, notopleuron and adjacent area of supra-alar, katepisternum and scutellum not velvety reddish brown to black (fig. 4.5)............................................................................ 6

5. 2 scutellar setae, mid pair absent; first flagellomere yellow; reddish brown species, silvery white microtomentose, especially in postpronotum, anepisternum and anepimeron; posterior margin of notopleuron and adjacent area of supra-alar reddish brown................................................................................... H. xanthocera Cresson

- 3 scutellar setae, mid pair present, weakly developed; first flagellomere yellow ventrobasally, brownish black dorsoapically; silvery gray species with scattered black areas; posterior margin of notopleuron and adjacent area of supra-alar densely microtomentose, appearing velvety black (fig. 20.1)............................................ H. bocaiuvensis sp. nov.

6. Frons as broad as high; ocellar setae long, subequal to pseudopostocellar setae.......................................................................................................................... H. longiseta sp. nov.

- Frons short, broader than high; ocellar setae short, usually far less than half length of pseudopostocellar setae............ 7

7. Dorsal 0.3–0.5 of notopleuron densely brown microtomentose, lower 0.5–0.7 of notopleuron densely silvery gray microtomentose (fig. 4.1)........................................................................ H. apalachee Deonier

- Notopleuron brown, silver or transitional (silver with some brown microtomentum)................................. 8

8. Ctenidial setae along anteroventral margin of forefemur reduced................................................ 9

- Ctenidial setae along anteroventral margin of forefemur well developed (fig. 20.6)................................. 11

9. Forebasitarsomere pale to orange yellow; first flagellomere dark brown, with orange yellow microtomentum basally............................................................................................. H. cavator Deonier

- Forebasitarsomere dark grayish brown to black; first flagellomere grayish brown black............................. 10

10. Mid and hind tarsi mostly dark grayish brown to black; 5–6 aristal rays (rarely 7); well-developed dorsocentral setae usually 1+1.................................................................................. H. vulgaris Cresson

- Mid and hind tarsi yellow to dark orange yellow, becoming dark brown apically; 7–9 aristal rays; well-developed dorsocentral setae 0+1.......................................................................... H. schneiderae sp. nov.

11. Surstylar carina weakly to moderately developed, in lateral view keel-like (fig. 24.8)............................... 12

- Surstylar carina greatly developed, in lateral view ax-like (fig. 23.8)............................................ 13

12. Surstylus in ventral view rounded, with a deep and narrow medial sulcus and a smaller lateral cleft forming a small and narrow process that is congruent with distiphallus (figs. 14.1 and 14.7); surstylar carina moderately developed and uniformly broad in lateral view (fig. 14.8); anterior margin of phallapodeme in ventral view with well-developed lateral lobes, Y-shaped (fig. 14.5); 6–8 aristal rays; female sternite 7 strap-like; hypoproct small, as large as wide, with no well-developed apical setulae..................................................................................... H. wirthi Korytkowski

- Surstylus in ventral view broad at base, narrow medially, with a deep and broad medial sulcus, and a lateral cleft forming an elongate process slightly bent outside (figs. 24.1 and 24.7); surstylar carina weakly developed, narrow in lateral view (fig. 24.8); anterior margin of phallapodeme in ventral view with weakly developed lateral lobes (fig. 24.5); 8–10 aristal rays, usually 9; female sternite 7 trapezoidal (fig. 25.1); hypoproct well developed, much larger than wide, with 2–4 apical well-developed setulae (fig. 25.1).................................................................. H. simplex sp. nov.

13. Sternite 5 with a broad and ornamented medial acuminate process, lateral arms with no cleft (figs. 30.1 and 30.2); superior margin of surstylar carina shallowly concave and sinuous (fig. 30.8)..................................... H. similis sp. nov.

- Sternite 5 without a medial acuminate process, each lateral arm deeply cleft, forming a medial, narrow, elongate, shallowly sinuous process bearing 2 apical setulae (figs. 23.1 and 23.2); superior margin of surstylar carina rounded (fig. 23.8)................................................................................................ H. vilelai sp. nov.