Trigonotylus setosus, Schwartz, Michael D., 2012

Schwartz, Michael D., 2012, Two new species of Trigonotylus (Hemiptera: Heteroptera: Miridae: Stenodemini) from western Canada and northwestern United States, Zootaxa 3174, pp. 51-58 : 54-58

Trigonotylus setosus sp. n.

( Figs. 1 F, I, K, 2, 3)

Diagnosis. Distinguished from T. viridis (Provancher) by the darker color, including the fuscous antennal segment I in the male, as well as by the longer, more sparsely distributed semi-erect setae on the latter (viz., Figs. 1 F and 1G). The longer antennal segment I with longer stout setae will distinguish T. setosus ( Fig. 1 F) from T. flavicornis ( Fig. 1 G) which also has a twisted endosomal spicule; the latter species has a shorter segment I with short suberect setae ( Figs. 1 K, 2).

Description. Male. Total length 5.44 (4.70–6.00). COLORATION: Head black, with two pale flavescent spots on post-vertex; mandibular plates pale; antennal segment I dark brown to black ( Fig. 1 F), segments II and III reddish brown to almost black; labium flavo-ochraceous with brown apex. Pronotum rather fuscous with lateral margins broadly pale, a narrow central longitudinal pale line, and with vague pale medio-lateral streaks; scutellum rather fuscous with narrow central longitudinal pale line and with pale patches medio-laterally. Hemelytra flavescent with clavus and medial areas of corium rather dusky. Legs pale flavescent with femora quite dusky, and tibia almost black. Venter pale flavescent with pleura medially dusky, and with posterior segments of abdomen and pygophore almost black. STRUCTURE: Frons elevated well above clypeus, with latter rounded anteriorly; antennal segment I with rather scattered, short, semi-erect setae, these set at 45° with segment surface ( Fig. 1 F); labium reaching to middle coxae. Genitalia —Endosoma with moderately long curved spicule ( Figs. 1 K, 2); left paramere as in figure 2. MEASUREMENTS: Head width 0.72 (0.70–0.78); vertex width 0.41 (0.40–0.43); antennal measurements 0.76 (0.70–0.83): 2.27 (2.15–2.38): 2.00 (1.85–2.30): 0.53 (0.50–0.55); labial length 1.64 (1.60–1.70); pronotal width 1.10 (1.05–1.15); pronotal length 0.60 (0.50–0.65).

Female. Total length 6.15 (5.80–6.45). COLORATION: Similar to male, but with antennal segment I pale flavo-ochraceous to red; antennal segments II–IV pale, often with reddish tinge. Head flavo-ochraceous with median longitudinal brown sulcus on vertex. Body pale yellowish dorsally with little fuscous markings, usually no more than vague brownish longitudinal lines on each side of midline on pronotum and scutellum, and with vague medio-lateral fuscous stripes on pronotum. Legs flavo-ochraceous with terminal two tarsomeres dark brown to black. MEASUREMENTS: Head width 0.79 (0.75–0.83); vertex width 0.50 (0.45–0.53); antennal measurements 0.82 (0.75–0.90): 2.33 (2.23–2.43): 2.06 (1.88–2.12): 0.56 (0.50–0.60); labial length 1.88 (1.80–2.00). Pronotal width 1.27 (1.15–1.40), pronotal length 0.68 (0.63–0.73).

Holotype: 3, CANADA: Yukon Territory: Whitehorse, swept from grass, 16.vii.1982 (L.A. Kelton), deposited in the Canadian National Collection of Insects, Ottawa [CNC].

Paratypes: CANADA: British Columbia: 2Ƥ, Atlin, 14.vii.1955 (H. Huckel) [CNC]; 13 1Ƥ, Atlin, 3000', 26.vii.1955 (H.J. Huckel) [CNC]; 1Ƥ, Atlin, 2200', 30.vii.1955 (B.A. Gibbard) [CNC]; 13 1Ƥ, id., 31.vii.1955 [CNC]; 1Ƥ, Liard Hot Spring, mi 496 Alaska Hwy, 9.vii.1959 (R. E. Leech) [CNC]; 23 1Ƥ, Summit L., Mi. 392, Alaska Hwy., 4500', 2–4.vii.1959 (E.E. MacDougall) [CNC]; 1Ƥ, id., 1500', 9–10.vii.1959 (R.E. Leech) [CNC]; 13 2Ƥ, id., 4200', 19–21.viii.1959 (E.E. MacDougall) [CNC]; 13, id., ex grass & Epilobium , 19–21.vii.1959 (R.E. Leech) [CNC]. Northwest Territories: 43 4Ƥ, Inuvik, sedge, 25.vii.1983 (L.A. Kelton) [CNC]; 13, Reindeer Depot, Mackenzie Delta, 12.vii.1948 (J.R. Vockeroth) [CNC]; 2Ƥ, id., (W.J. Brown) [CNC]; 23 2Ƥ, id., 13.vii.1948 (W.J. Brown) [CNC]; 13, id., 14.vii.1948 (J.R. Vockeroth) [CNC]; 23, id., 17.viii.1948 (J.R. Vockeroth) [CNC]. Yukon Territory: 13, 3Ƥ, Alaska Hwy. Mile 1098.5, Duke R., 3.vii.1974 (G.G.E. Scudder) [Scudder Coll., UBC]; 13, Dempster Hwy. Mi 87, 4–8.viii.1973 (G. & D.M. Wood) [CNC]; 23 1Ƥ, Dempster Hwy., Engineer Cr., 27.vii.1983 (L.A. Kelton) [CNC]; 173 1Ƥ, Dempster Hwy., Tombstone, 27.vii.1983 (L.A. Kelton) [AMNH, CNC, UBC, USNM]; 1Ƥ, Destruction Bay, 26.vii.1982 (L.A. Kelton) [CNC]; 43 12Ƥ, Firth River, 3.viii.1956 (R.E. Leech) [CNC]; 73 14Ƥ, Haines Jct., 28.vii.1982 (L.A. Kelton) [AMNH, CNC, UBC, USNM]; 23, North Fork Pass km 64 Dempster Hwy., 64°27´N 138°14´W, 21.vii.1982 (G.G.E. Scudder) [CNC]; 1Ƥ, Rampart House, 17.vii.1951 (J.E.H. Martin) [CNC]; 13, “Sheldon Pass”, 62°44'N 131°01'W, 4.viii.1986 (S.G. Cannings) [UBC]; 13, same data as holotype [CNC]. UNITED STATES: Alaska: Denali Co.: Mount McKinley National Park, #4 1730 ft, 27.vii.1957 (G.W. Byers and party) [CNC] 33.

Etymology. Named to reference the antennal segment I with bristly stout erect setae, setosus, Latin.

Hosts. No specimens were collected on a documented plant species. Records indicate that probable hosts are unidentified species of sedge, Carex (Cyperaceae) and grasses ( Poaceae ). The only specimen taken on Chamerion sp. [perhaps fireweed, formerly Epilobium ] ( Onagraceae ) is considered a sitting record.

Distribution. Figure 3. In Canada known mostly from the formerly glaciated areas of the Yukon Territory with additional specimens taken in adjacent far northwestern Northern Territories and northern British Columbia. In the United States found at low elevation in Denali National Park, Alaska.

Discussion. There are specimens of T. viridis taken from the same collecting event as T. setosus . In these specimens the antennal segment I have faint red streaks, where as the antennal segment I of T. setosus is uniformly dusky.

Figures

FIGURE 1. Trigonotylus species. A – G. Antenna, dorsal view, scale = 0.5 mm. A. T. americanus. B. T. antennatus. C. T. caelestialium. D. T. exilis. E. T. flavicornis. F. T. setosus. G. T. viridis. H – I. Dorsal habitus, scale = 2.0 mm. H. T. exilis. I. T. setosus. J – K. Endosoma, left lateral view, scale = 0.2 mm. J. T. exilis. K. T. setosus.