Eugnoriste

Kauschke, Ellen, 2017, New Black Fungus Gnats (Diptera, Sciaridae) of North America. Part IV. Genera Eugnoriste Coquillett and Keilbachia Mohrig, Zootaxa 4319 (1), pp. 53-76 : 54-55

Key to the species of Eugnoriste (males)

1 Mouth part very long in both sexes, at least as long as the head high; gonostylus with long and dense hairs on the outer side..

.................................................................................................... 2 - Mouth part long in both sexes, but shorter than the head high; gonostylus with short hairs on the on outer side............ 3

2 Mouth part in both sexes twice as long as the head high; haired areas on distal tergites not distinctly darkened............................................................................... .. Eug. occidentalis Coquillett,1896 ( Fig. 6 )

- Mouth part in both sexes as long as the head high; haired area of the 7th tergite black................................................................................................... .. Eug. brevirostris Coquillett, 1904 ( Fig. 3 )

3 Gonostylus slender, tapered towards the apex; ventral base of the hypopygium bare; 9th tergite bilobate, length of lobes equals one third of the length of the gonocoxites............................................... Eug. florea sp. n. ( Fig. 4 )

- Gonostylus broad, not taper towards the apex, apically more or less rounded....................................... 4

4 Gonocoxites with a patch of 5–6 bristles in the middle of the inner side; ventral base of the hypopygium bare; 5th–7th abdominal tergites with distinct bristle patches; mouth part shorter than the head high........... Eug. brachycostalis sp. n. ( Figs 1 , 2 )

- Gonocoxites without distinct bristles in the middle of the inner side; ventral base of hypopygium with short hairs, or the 9th sternite bilobated...................................................................................... 5

5 6th and 7th tergites with dense hairs on the distal borders; gonostylus is wider in the apical third than in the middle, concaved in the apical third only............................................................... Eug. hirsuta sp. n. ( Fig. 5 )

- 7th tergite with dense hairs on the distal border only; gonostylus wider in the middle than in the apical third, concaved in the middle or the basal half................................................................................. 6

6 Gonostylus with two apical spines; 9th sternite shortly bilobated............ Eug. villosoabdominalis Mohrig, 2003 ( Fig. 8 )

- Gonostylus with two spines near to the middle; 9th sternite bilobated, with long lobes (half as long as gonocoxites)........................................................................................ .. Eug. ptilosis sp. n. ( Fig. 7 )

Figures

FIGURE 1. Eugnoriste brachycostalis sp. n. Male. Holotype. A. Gonostylus, ventral vieW. B. Ventral base of hypopygium.

FIGURE 2. Eugnoriste brachycostalis sp. n. Male. Holotype. A. Head and thoraX. B. Abdominal tergites 3 – 8. C. Antennal flagellomeres 3 – 4. D. ApeX of fore tibia. E. C / W-seCtion of the Wing apeX (draWing, 80 X).

FIGURE 3. Eugnoriste brevirostris Coquillett, 1904. Male. Holotype. A. Part of hypopygium, ventral vieW. B. Gonostylus (draWing, 200 X). C. Head. D. Antennal flagellomeres 3 – 4. E. Abdominal tergites 3 – 6. F. CerCus (draWing, 200 X).

FIGURE 4. Eugnoriste florea sp. n. Male. Holotype. A. Part of hypopygium, ventral vieW. B. Head and thoraX. C. 4 th flagellomere. D. Wing. E. ApeX of fore tibia. F. Abdominal tergite 6, dorsal vieW.

FIGURE 5. Eugnoriste hirsuta sp. n. Male. Holotype. A. Part of hypopygium, ventral vieW. B. Head With basal flagellomeres. C. Abdominal tergites 5 – 8.

FIGURE 6. Eugnoriste occidentalis Coquillett, 1896. A. Male. Part of hypopygium (speCimen from California), ventral vieW. B. Female. Head (after Menzel & Mohrig 2000, Fig. 573).

FIGURE 7. Eugnoriste ptilosis sp. n. Male. Holotype. A. Hypopygium, ventral vieW. B. Gonostylus, ventral vieW (draWing, 400 X). C. ApeX of gonostylus With Whiplash-hair and the tWo subapiCal spines. D. 4 th flagellomere. E. Head. F. Abdominal tergites 3 – 6. G. C / W - indeX of the Wing apeX (draWing, 80 X).

FIGURE 8. Eugnoriste villosoabdominalis Mohrig, 2003. Male. A. Part of hypopygium, ventral vieW. B. Gonostylus, ventral vieW (draWing, 400 X). C. Head. D. 4 th flagellomere. E. Abdominal segments 5 – 6. F. ApeX of fore tibia (draWing, 200 X). G. Tegmen (draWing, 200 X).