Gellia Stål

Type Species: Aelia albivittis Germar, 1838, by subsequent designation (Kirkaldy, 1909).

Tribal Placement: Linnavuori (1982) included this genus in his Lobopeltista group, but Ahmad & Kamaludding (1990) included it in the Tetrodini.

Comments: Linnavuori (1982) provided a key to the African species, but did not included bicolorata Distant from the Congo, or incognita Distant from an unknown locality. Ahmad & Kamaluddin (1990) provided a key to the Indo-Pakistan species, but did not include kuntiae Mathew from India.

1 Dorsal surface with whitish scale-like hairs; anterolateral lobes of pronotum rectangular or roundly bluntly angular; mesosternum not concave (rugulosa species group)	2
- Dorsal surface without scale-like hairs; anterolateral angles of pronotum distinctly produced apicad (faintly so in pilosa); mesosternum concave (dilatata species group)	3

2(1) Length 18-19 mm; body elongate, nearly parallel-sided; blackish brown; costal margin with longitudinal band of dense whitish tomentum; membrane grayish hyaline, veins concolorous; anterolateral pronotal lobes rounded; disk finely punctate, only slightly rugose	albivittis (Germar)
- Length 14-17 mm; body broader; dark reddish brown; membrane pale brownish, veins blackish; anterolateral lobes of pronotum sharp; disk with numerous shiny pimple-like elevations	rugulosa Distant

3(1) Hair covering of dorsal surface long, semierect, dense	pilosa Linnavuori
- Hair covering inconspicuous	4

4(3) Puncturing on dorsal surface, including head, coarse and dense	angulicollis Stål
- Puncturing on dorsal surface, especially on head, fine	5

5(4) Color yellowish or reddish brown	6
- Color blackish	7

6(5) Larger, length 15-16 mm; pale ochraceous; ventral surface with only indistinct infuscations; puncturing finer, on venter indistinct; second antennal segment distinctly shorter than third; ventral margin of pygofer thicker, median notch deeper and broader	punctulata Stål
- Smaller, length 11.75-15 mm; darker, yellowish or reddish brown; ventral surface, and femora, with dark irroration; venter with dark patches and distinct puncturing; second antennal segment usually nearly as long as third; ventral margin of pygofer thinner, median notch smaller	neavei Schouteden

7(5) Scutellum elongate, only moderately tapering apicad; second and third antenal segments fused	monticola Linnavuori
- Scutellum distinctly tapering apicad, broadly triangular; second and third antennal segments not fused	8

8(7) Robust, length 14.5 mm; antennae very short, total length of antennae 1.3 times as long as the width of the head across the eyes	dilatata (Signoret)
- Smaller, length 12.0-13.2 mm; antennae longer, total length of antennae 1.5-1.64 times as long as the width of the head across the eyes	tristis Schouteden

1 Length of head distinctly less than length of pronotum, length of head and pronotum together distinctly shorter than 1.5 times length of pronotum	2
- Length of head greater than length of pronotum; length of head and pronotum together distinctly longer than 1.5 times length of pronotum	3

2(1) Pronotum with short posterior lobes; scutellum with longer apical lobe; rostrum reaching posterior margin of fore-coxae; metathoracic scent gland ostioles with peritreme very short, lobe-like	nigripennis (Dallas)
- Pronotum without posterior lobes; scutellum with apical lobe markedly shorter and much narrowed; rostrum reaching anterior margin of fore-coxae; metathoracic scent gland ostioles with peritreme large, somewhat blade-like	albivittis (Germar)

3(2) Anteocular distance slightly longer than 1.5 times length posterior of head including eyes; in males, posterior margin of paramere convex; in females, basal plates contiguous, apically convex	pakistanica Ahmad & Kamaluddin
- Anteocular distance about equal or slightly shorter than 1.5 times length of head including eyes; in males, posterior margin of paramere sinuate; in females, basal plates separated mesially, sinuate apically	fusca Ahmad & Kamaluddin

David A. Rider
Professor of Entomology
North Dakota State University
202 Hultz Hall
Fargo, ND 58105
E-Mail: David.Rider@ndsu.edu