Pleotrichophorus wasatchii (Knowlton 1927)

Pleotrichophorus wasatchii (Knowlton)

Capitophorus wasatchii Knowlton, 1927:238 [lectotype: apt. v.f., Honeyville, Utah, 10–IX–1925, GFK, on Chrysothamnus; in USNM]; 1948:123; 1954:9.—Gillette and Palmer, 1934:157–158 [in part].—Knowlton and Smith, 1936a:112 [in part].—Palmer, 1952:273 [in part].

?Capitophorus wasatchii Knowlton.—Kring 1955:65.—Leonard, 1959:12 [identity doubtful].

Pleotrichophorus wasatchii (Knowlton).—Hille Ris Lambers, 1953:115; 1969:169, 172, 180.

DIAGNOSIS.—P. wasatchii can be distinguished from the closely related P. ambrosiae and P. ohioensis by a combination of sharply acute rostrum IV+V; short, widely expanded and sessile head and body setae; and the presence of 1–3 sensoria on antennal segment 3. It resembles P. diutius in the shape of the setae and the presence of few sensoria but it differs in the shape of the last rostral segment (rather bluntly pointed and slightly convex-sided in that species), the presence of relatively fewer df setae (26.83 ± .29, n = 6 vs. 17.84 ± .98, n = 19) and in having a smaller co/ca ratio (1.30 ± .04, n = 14 vs. 1.78 ± .04, n = 34).

DESCRIPTION.—Apterous Viviparous Female: Color in life greenish with a pruinose covering (Knowlton, 1927:238); cleared specimen pale with apices of a.s.IV and V, entire a.s.VI, apices of rostrum, tibiae and entire tarsi brown. Body length 1.65–2.10 (1.89, n = 7), width across the eyes .42–.46 (.444, n = 7) mm. Laterofrontal and mesofrontal tubercles of head moderately developed; mf 1 or 2p, lf 2 or 3 on each side, df 23–30 (26.83 ± .29, n = 6), vf 8–10, vlf 1p, pc 2p, md 3p, ac 4 to 6; dorsal setae cone- or fan-shaped, flaring widely from base, without distinct stems; ventral setae with vf and pc also expanded but less so, ac and pc blunt or slightly knobbed at apices; mf .0264–.0330 (.0289, n = 17), df–1 .0330–.0396 (.0358, n = 14) mm long. Antennal segment I moderately produced on inner distal margin, faintly imbricate, bearing 6–9 knobbed setae aside from usual pointed one on dorsum. A.s.II with knobbed setae. A.s.III with 1–3 (2.31, n = 13) sensoria. A.s.IV and V slightly shorter or equal to a.s.III in length; a.s.VI with unguis averaging 5½ times (range = 4.47–6.38, n = 10) as long as its base.

Dorsal body setae of similar shape and size to those of head. Cauda .26–.31 (.289, n = 7) mm long; elongate, slightly constricted on basal ⅓, apex broadly rounded; spiculate; with 2 lateral pairs, 1 posterodorsal setae. Cornicles .34–.40 (.374, n = 14) mm long, about 1¼ times (range = 1.17–1.38, m = 1.30 ± .04, n = 14) length of cauda; cylindrical with bases slightly incrassate; imbricate, wrinkled, with small, blunt spicules; extreme apices dusky. Legs with 3, 3, 3 hairs on first tarsal joints; hind tibiae 1.17–1.28 (1.22, n = 12), hind ta–2 .13–.15 (.144, n = 12) mm long. Rostrum IV+V .115–.13 (.121, n = 7) mm long, ¾ to equal (m = .83 ± .05, n = 10) hind ta–2 in length; tapering gradually to sharply pointed distal ⅓; with 1 basal, 2 dorsal, and 3 lateral pairs of setae, al about 3 times as long as ml and pl setae.

Measurements (in mm) of lectotype: BL 2.0, We .46; a.s.III both .49, a.s.IV .46 and .49, a.s.V .42 and .40, a.s.VI .14 + .82 and .15 + .78; cornicles .37 and .40, cauda .29, hind tibiae 1.23 and 1.26, hind ta–2 both .15, and rostrum IV+V .12.

Alate Viviparous Female: Unknown.

Sexuales: Unknown.

HOST.—Chrysothamnus nauseosus var. graveoleus and Chrysothamnus sp.

DISTRIBUTION.—Aside from type-locality, Knowlton (1927:238) lists Amalga and Madsen, Utah, in the original description. Other records on Chrysothamnus include Moses Lake, Washington, and possibly also from Colorado (Knowlton and Smith, 1936a: 112; Gillette and Palmer, 1934:158).

TYPES (designated from fairly cleared, not remounted specimens).—Lectotype: apt.v.f. with data indicated above; inner specimen at about 8:00 o’clock of type-slide. Paralectotypes: 6 apt.v.f., 6 apt.ny., and 2 altd.ny. with same data and mounted on same slide as lectotype.

SPECIMENS EXAMINED.—Only the types.