Key to species of Bennarella Muir (males and females)

1 Pedicel totally yellow (Fig. 3); forewing hyaline in the apical half (Fig. 1); anal tube with a well-produced ventral lobe near base (Fig. 6)...................................................................... B. bicoloripennis Muir, 1930

- Pedicel brown or partially brown (Figs 21, 86); forewing semi hyaline, brownish or spotted apically; anal tube without ventral lobe near base....................................................................................... 2

2 Median region of mesonotum brown (Fig. 22); anal tube cup-shaped (Figs 24–25); pygofer with one long spiniform projection of different sizes on each side of the posterior margin, convergent in posterior view (Figs 24, 26)...... B. fusca Muir, 1930

- Median region of mesonotum yellowish on anterior half or completely yellow (Figs 40, 98); pygofer and anal tube not as above.............................................................................................. 3

3 Forewing apical half with numerous whitish-yellow and brown regions (Figs 130–131)............................. 4

- Forewing with apical half mostly brown (Figs 128–129, 132–133).............................................. 5

4 Lateral carinae of frons weakly directed obliquely laterally (Figs 68–69); median longitudinal carina of pronotum absent; fore leg and mid leg dark brown, hind leg yellowish brown (Fig. 66); apex of anal tube not prolonged distally (Fig. 71); periandrium with two spines near apex, aedeagus slender with two short spines (Fig. 76)................... B. maculipennis sp. nov.

- Lateral carina of frons strongly directed obliquely laterally (Figs 85–86); median longitudinal carina of pronotum present; legs yellowish, except forecoxa and mid coxa dark brown (Fig. 84); apex of anal tube prolonged distally (Fig. 88); periandrium with three spines near apex, aedeagus swollen without spines (Fig. 93)................................ B. rafaeli sp. nov.

5 Basal portion of the wing, until the apex of the clavus, pale brown to yellow, and the remaining predominantly brown (Figs 55, 129); hind leg predominantly yellow; pygofer short, strongly narrowed at dorsal half (Fig. 59)....... B. henriquesi sp. nov.

- Basal portion of the wing brown with yellowish narrow longitudinal stripes (Figs 128, 132–133); hind leg brown; pygofer not strongly narrowed in dorsal half......................................................................... 6

6 Strongly marked median carina on the frons (Fig. 110); frons with large portion in the lower region, close to the median ocellus, yellow (Fig. 110); median region of mesonotum brownish on posterior half (Fig. 111); anal tube truncate apically with two short, slender, spinelike projections at apex (Fig. 115).......................................... B. xavieri sp. nov.

- Weakly marked median carina on the frons (Fig. 39); frons only slightly yellowish in a slender transverse strip in the lower region, laterally to the median ocellus (Fig. 39); median region of mesonotum completely yellow (Fig. 40); anal tube not as above.............................................................................................. 7

7 Lateral carinae of the frons, above lateral ocellus, yellow for a short distance, not reaching half the height of the eye in frontal view (Fig. 39); median longitudinal carina of pronotum present (Fig. 40); anal tube with apex deeply reentrant, bifid, with two robust parallel lobes (Fig. 44); periandrium without spines and aedeagus with three spines (Figs 47–48)...................................................................................................... B. guidai sp. nov.

- Lateral carinae of the frons, above lateral ocellus, yellow for a long distance, extended beyond half the height of the eye in frontal view (Fig. 97); median longitudinal carina of pronotum absent (Fig. 98); anal tube slightly reentrant forming two robust divergent lobes (Fig. 102); periandrium with one long spine, aedeagus with two long spines near base and two short spines apically (Figs 105– 106)..................................................................... B. vittata sp. nov.