Reduvius

Weirauch, Christiane, Russell, Kaleigh & Hwang, Wei Song, 2015, Reduvius frommeri, a new species of Reduviidae from the Western United States (Hemiptera: Reduviidae), with a synopsis of the Nearctic species of Reduvius Fabricius, Zootaxa 3972 (2), pp. 267-279 : 269

Key to the species of Reduvius in the Western Nearctic

(modified from Wygodzinsky and Usinger 1964). Morphological features are illustrated in Figs. 1–6 (habitus images and morphological details).

1 Total length in both sexes about 17 mm, coloration dark brown ( Fig. 3 ); medial process of pygophore square and truncate ( Fig. 5 ); aedeagus without projections on the basal plate extension ( Fig. 6 )........................... R. personatus (Linné)

- Total length in both sexes 14 mm or less, coloration mostly light brown to pale yellowish, with brown or dark markings ( Figs. 1 , 3 ); medial process of pygophore either with broad base and divergent, lateral rami or with narrow base and apical triangular rami ( Fig. 5 ); aedeagus with more ( R. frommeri , n. sp., R. senilis , and R. vanduzeei ) or less ( R. sonoraensis ) distinct projections on the basal plate extensions ( Fig. 6 ).................................................................. 2

2 Body uniformly pale yellowish, with head, scape, and labium dark brown to sometimes almost black, contrasting with pale coloration of pronotum ( Fig. 1 ); medial process of pygophore with narrow base and apical triangular rami ( Fig. 5 ).............................................................................................. R. frommeri , n. sp.

- Body light brown, with darker markings on hemelytra, head and pronotum of the same color, not contrasting ( Fig. 3 ); medial process of pygophore with broad, low base and divergent, lateral rami ( Fig. 5 )..................................... 3

3 Eye barely reaching ventral margin of head (seen in lateral view) and dorsally not reaching the level of the ocellus ( Fig. 4 ; R. sonoraensis , grey arrow); scutellar process short ( Fig. 3 ; R. sonoraensis )....................... R. sonoraensis Usinger

- Eye surpassing the ventral margin of the head (seen in lateral view) and dorsally reaching to about the level of the ocellus ( Fig. 4 ; R. senilis and R. vanduzeei , black arrow); scutellar process long ( Fig. 3 )........................................ 4

4 Total length in both sexes 13–14mm ( Fig. 3 ; R. vanduzeei ); aedeagus with basal plate projections tapering apically ( Fig. 6 ; R. vanduzeei )............................................................. R. vanduzeei Wygodzinsky and Usinger

- Total length in both sexes about 10–11mm ( Fig. 3 ; R. senilis ); aedeagus with basal plate projections broadly rounded ( Fig. 6 ; R. senilis )............................................................................... R. senilis Van Duzee

Figures

FIGURE 1. Habitus of male (A – C) and female (D – F) of the Western Nearctic Reduvius frommeri, sp. n., in dorsal (A, D), ventral (B, E) and lateral (C, F) views. UCRC _ ENT 0 0 0 20227 is the male holotype, UCR _ ENT 0 0 0 45345 a female paratype. Scale bars are 1 mm.

FIGURE 2. Head, thoracic, and abdominal structures of Reduvius frommeri, sp. n. Dorsal (C, G), lateral (A, B, D, F, H), and ventral (E, I) views of: A, head; B, C, E, head and thorax; D, foreleg; F, thorax; G, hemelytra; H, midleg; I; female abdomen and external genitalic sclerites. fsp, fossula spongiosa; 12, 13, 14: labial segment 2, labial segment 3, labial segment 4, mdp, mandibular plate.

FIGURE 3. Habitus (dorsal, lateral) of males of remaining species of Reduvius occurring in the Nearctic region: R. personatus (A, B; UCR _ ENT 00064193), R. senilis (C, D; UCR _ ENT 00064157), R. sonoraensis (E, F; UCR _ ENT 00064191), and R. vanduzeei (G, H; UCR _ ENT 00064152).

FIGURE 4. Lateral view of the head of R. senilis (A; UCR _ ENT 00078935), R. sonoraensis (B; UCR _ ENT 00064191), and R. vanduzeei (C; UCR _ ENT 00045714), showing differences in eye shape and size. Black arrow indicates eye surpassing the ventral margin of the head, grey arrow eye barely reaching ventral margin of head.

FIGURE 5. Male pygophore (in dorsal, ventral, lateral, and caudal views; insets show close-up of dorsal pygophore process) of the four Western Nearctic species of Reduvius and the cosmopolitan R. personatus. Dark grey arrow indicates narrow base and apical triangular rami of medial process of pygophore in R. frommeri, n. sp., light grey arrow narrow slender process in R. personatus, and black arrows the short, wide process with long bifid processes. Scale bars are 0.5 mm.

FIGURE 6. Male aedeagus of the four Western Nearctic species of Reduvius and the cosmopolitan R. personatus. Black arrows indicate projection of basal plate extension, green arrows lateroventral phallotheca sclerotization, blue arrows adjacent struts, white arrow distal half of right and left basal plate struts in dorsal view separated from each other. Scale bars are 0.5 mm.