Metajalysus, Stusak. Stusak, 1977

Henry, Thomas J. & Dellapé, Pablo M., 2021, Revision of the Neotropical Stilt Bug Genus Metajalysus Štusák (Hemiptera Heteroptera: Berytidae), with Descriptions of Three New Species, Zootaxa 4958 (1), pp. 690-701 : 692

Key to the Species of Metajalysus

1 Head black dorsally, except for yellowish median and lateral carinae; abdomen extensively black, usually on basal one half or more; femora smooth, at most, with only tiny, indistinct setigerous tubercles...................................... 2

- Head brown dorsally, sometimes dark brown or black along gular area; abdomen yellowish brown, often dark brown on basal third; femora with distinct setigerous tubercles, especially near apices............................................ 3

2 Length of setae on antennal scape and femora short, subequal to or slightly greater than diameter of segments; middle ventral margin of male genital aperture nearly flat ( Figs. 24, 25 ); distribution: Argentina....................... horvathi Štusák

- Length of setae on antennal scape and femora one and a half to two or more times diameter of segments; middle ventral margin of male genital aperture with sharp inverted V-shaped process ( Figs. 28, 29 ); distribution: Ecuador........... pilosus , n. sp.

3 Smaller species, length 3.30–3.62 mm; pronotum with ca. 12–15 or more erect setae on either side of disc ( Figs. 1, 2 ); femora clavate apically, yellowish brown with a distinct subapical dark brown band; middle ventral margin of male genital aperture with an inverted V-shaped process ( Figs. 17, 18 ); distribution: Argentina.............................. clavatus , n. sp.

- Larger species, length 4.00- 4.68 mm, pronotum with ca. 5 or 6 erect setae on either side of disc ( Figs. 4, 5 ); femora, more gradually enlarged to apex, yellowish brown to brown, with apex pale on darkest specimens; middle ventral margin of male genital aperture nearly straight across ( Figs. 21, 22 ); distribution: Argentina and Bolivia......................... graziae , n. sp.

Figures

FIGURES 17–31. Male genitalia of Metajalysus spp. M. clavatus, n. sp.: 17–20. 17, genital capsule, caudal aspect, in situ. 18, genital capsule, caudal aspect, cleared. 19, genital capsule, dorsal aspect, cleared. 20, left and right parameres. M. graziae, n. sp.: 21–23. 21, genital capsule, caudal aspect, in situ. 22, genital capsule, caudal aspect, cleared. 23, left and right parameres. M. horvathi: 24–27. 24, genital capsule, caudal aspect, in situ. 25, genital capsule, caudal aspect, cleared. 26, genital capsule, dorsal aspect, cleared. 27, left and right parameres. M. pilosus, n. sp.: 28–31. 28, genital capsule, caudal aspect, in situ. 29, genital capsule, caudal aspect, cleared. 30, genital capsule, dorsal aspect, cleared. 31, left and right parameres.

FIGURES 1–6. Metajalysus spp. 1, M. clavatus, n. sp., male, dorsal aspect. 2, M. clavatus, male, lateral aspect. 3, M. clavatus, female, dorsal aspect. 4, M. graziae, n. sp., male, dorsal aspect. 5, M. graziae, male, lateral aspect. 6, M. graziae, female, dorsal aspect. Scale bar for plate = 1 mm.