Ariasa Distant 1905

Key to the genus Ariasa Distant 1905 View in CoL

The key is modified from Sanborn (2016a) with the addition of the two species described since it was produced.

1. White basal area of hindwings, abdominal tergites unicolorous piceous................... A. albiplica ( Walker 1858 View in CoL )

– Basal area of hindwings not white, abdominal tergites more than one color....................................................... 2

2. Lateral area and posterior of abdominal tergites red...... ........................................... A. nigrorufa ( Walker 1850 View in CoL )

– Lateral area and posterior of abdominal tergites not red ........................................................................................ 3

3. Lateral abdominal tergites, pronotal collar, pronotal scutes, and costal margin ochraceous.......................... ................................................ A. arechavaletae ( Berg 1884 View in CoL )

– Lateral abdominal tergites, pronotal collar, pronotal scutes, and costal margin not ochraceous....................... 4

4. Body length less than 20 mm ....................................... 5

– Body length greater than 20 mm ................................... 7

5. Dorsal head with complete transverse fascia, postclypeus without fasciae, castaneous lateral sigillae with piceous anterior margin and piceous fascia on posteromedial margin, submedian sigillae piceous with castaneous midline, abdominal tergites 1–7 tawny with transverse castaneous mark bordered anteriorly and posteriorly with piceous and green posterior margin on midline............................ A. venezuelaensis Sanborn 2020 View in CoL

– Dorsal head with incomplete transverse fascia or primarily piceous dorsal head, postclypeus with ochraceous or piceous fascia, mesonotum with piceous linear fasciae or with large, obconical piceous fascia with ferruginous posterior of lateral fasciae, abdominal tergites with a piceous anterior margin on the dorsal midline of tergites 1 and 2 or piceous abdominal tergites with tawny posterior margins.............................................................................. 6

6. Mesonotum with linear piceous fascia, abdominal tergites tawny with piceous anterior margin on midline of tergites 1–2................................ A. urens ( Walker 1852 View in CoL )

– Mesonotum with large, obconical piceous fascia, abdominal tergites piceous with tawny posterior margins....................................... A. diupsilon ( Walker 1850 View in CoL )

7. Rostrum reaching abdominal sternite II or III............. 8

– Rostrum not reaching abdomen or only to abdominal sternite I......................................................................... 9

8. Rostrum reaching abdominal sternite II, vertex completely piceous, fore wing basal cell almost completely piceous, male operculum without posterolateral extension, female operculum with curved posterior margin ......................................... A. maryannae Sanborn 2016b View in CoL

– Rostrum reaching abdominal sternite III, vertex piceous with castaneous markings, fore wing basal cell with piceous spot in distal anterior corner, male operculum with posterolateral extension, female operculum with straight posterior margin.................... A. iporaensis View in CoL n. sp.

9. Basal cell of fore wing marked with brown................. 10

– Basal cell of fore wing marked with piceous................ 13

10. Anterior margin of postclypeus truncated, white spots on lateral tergite 8, body length about 23 mm ............. .................................... A. alboapicata ( Distant 1905 View in CoL )

– Anterior margin of postclypeus bulbous, no white spots on lateral tergite 8, body length greater than 25 mm ........... 11

11. Pronotal collar green, white spots on anterolateral mesonotum, body length about 31 mm ................................ .................................. A. albimaculosa Sanborn 2016a View in CoL

– Pronotal collar tawny or tawny heavily marked with piceous, no white spots on anterolateral mesonotum, body length about 28 mm .......................................... 12

12. Head tawny with piceous around ocelli, pronotal collar light tawny with transverse piceous fascia, basal cell of fore wing with small dark tawny spot............................ ........................................ A. colombiae ( Distant 1892 View in CoL )

– Head piceous with ochraceous markings, pronotal collar tawny with piceous lateral angles, basal cell of fore wing mostly filled with dark tawny spot.................................... ............................................ A. nigrovittata Distant 1905 View in CoL

13. Abdominal tergites mostly tawny with small piceous markings, plaga dark gray, piceous body markings reduced..... 14

– Abdominal tergites at least half piceous, plaga white or ochraceous, piceous body markings obvious............... 15

14. Rostrum reaching to abdominal sternite I, triangular extension in middle of ventral uncus about one-third the length of the uncus and folded mediad not seen in lateral view, female abdominal segment 9 smoothly arched dorsally................... A. bilaqueata ( Uhler 1903 View in CoL )

– Rostrum reaching to hind leg trochanters, triangular extension in middle of ventral uncus about one-fifth the length of the uncus and upright seen as a triangle in lateral view, female abdominal segment 9 straight with slightly upturned dorsal beak.......................................... .............................................. A. bartletti Sanborn 2016a View in CoL

15. Abdominal tergites mostly piceous without variegated silver and piceous pile forming an arch on the dorsal surface, plaga white............. A. russelli Sanborn 2016b View in CoL

– Abdominal tergites about half piceous with variegated silver and piceous pile forming an arch on the dorsal surface, plaga ochraceous............... A. egregia ( Uhler 1903 View in CoL )