Rivudiva Lugo-Ortiz & McCafferty, 1998

Diagnosis

Nymph. 1) maxillary palp long and robust, segment I almost as long as length of galea-lacinia or even longer, and segment II with short pointed distal projection (Figs 5, 15, 24); 2) ventral canine of maxilla laterally expanded (Figs 26–27); 3) lingua sub-quadrangular, apex with tuft of setae (Figs 4, 14); 4) glossa oblong, with conspicuous stout setae on inner or distal margin (Figs 6, 16); 5) segment II of labial palp with rounded inner medial protuberance, segment III conical (Figs 6, 16); 6) femora with distinct robust, usually long setae on outer margin, inner margin, and on a longitudinal row on dorsal and ventral surface (Figs 7, 17, 19, 30–33); 7) tarsal claws with two rows of denticles (Figs 8, 18, 34, 35); 8) hind wing pads present or absent.

Imago. 1) marginal intercalaries of fore wing double; 2) hindwings present or absent, when present with two longitudinal veins and with costal projection pointed, placed in the basal fourth of anterior margin; 3) forceps with distal segment long, about 2× as long as wide; 4) fusion of first and second segment of forceps on basal third; 5) distal margin of subgenital plate with shallow emargination or with small pointed projection.

Distribution. Neotropical, until now restricted to South America in the following countries: Brazil, French Guiana, Paraguay, and Venezuela.

Key to the species in the nymphal stage

1. Abdominal sterna with robust, apically pointed setae (Figs 36–37); hind wing pads absent........................... 2

1’. Abdominal sterna with simple setae; hind wing pads present................................................... 3

2(1). Scape and pedicel with apically pointed setae (Fig. 28); fore tarsus without long setae..................... R. trichobasis

2’. Scape and pedicel without apically pointed setae; fore tarsus with long setae.................... R. oonirikoperi, sp. nov.

3(1’). Setae on dorsum of fore femur long (as long as maximum width of femur) and apically pointed (Fig. 32)..... R. minantenna

3’. Setae on dorsum of fore femur short (at most ⅓ maximum width of femur) and apically blunt (Figs 7, 30, 31).................................................................................................... R. inma, sp. nov.