Tetranychus cobrensus Baker & Tuttle 1972

Tetranychus (Armenychus) cobrensus

The striae of the female are transverse, which is typical for the subgenus; the head of the aedeagus is very small, the anterior and posterior angulations being minute.

FEMALE.—Dorsal hysterosomal striae transverse; dorsal body setae long and slender, as are the coxal and ventral setae; rostrum reaching to middle of genu; palps reaching to distal end of genu; stylophore tapering distally and rounded. Leg setae typical for subgenus and long and slender. Length of body 287μ; including palpus 364μ.

MALE.—Body and leg setae similar to those of female. Rostrum and palpus about length of those of female. Empodium I with a strong dorsomedian spur and three pairs of coalesced ventral hairs; empodium II with dorsomedian spur and free ventral hairs. Aedeagus upturned; head only slightly wider than short neck; anterior and posterior angulations of head minute and about equal; head set at a slight angle to axis of shaft. Length of body 223μ; including palpus 332μ.

HOLOTYPE.—Male, USNM 3415, ex Lithosperrnum cobrense Greene, Pinedale, Arizona, 25 July 1966.

PARATYPES.—Male and female with the above data.

Other specimens with the same data were studied.

Tenuipalpini Berlese, 1913:17.

Tenuipalpidae Sayed, 1930:1015.—Baker and Pritchard 1956:357.

The Tenuipalpidae (false spider mites) have a simple palpus, without a spur on the fourth segment, and often with reduced segmentation. Usually the body is flattened dorsoventrally and the integument is ornately sculptured.

Genera of the Tenuipalpidae treated here are: Aegyptobia Sayed, Pentamerismus McGregor, Pseudoleptus Bruyant, Brevipalpus Donnadieu, Tenuipalpus Donnadieu, Dolichotetranychus Sayed, Raoiella Hirst, Raoiellana, new genus, and Colopalpus Pritchard and Baker.

Aegyptobia Sayed, 1950:1015.—Pritchard and Baker 1958: 179.—Baker and Tuttle 1964:3.

TYPE-SPECIES.—Aegyptobia trägårdhi Sayed, by monotypy and subsequent designation.

Aegyptobia pseudoleptoides (Baker and Pritchard)

Pentamerismus pseudoleptoides Baker and Pritchard, 1954:357.

Aegyptobia pseudoleptoides (Baker and Pritchard), 1958:180.

This species was originally described from Bouteloua gracilis (Humboldt, Bonpland, and Kunth) Lagasca, Modena, Utah. It has been collected in Arizona as follows: Bouteloua aristidoides (Humboldt, Bonpland, and Kunth) Grisebach, at Tucson; Panicum capilare Linnaeus, Gila Bend; and Tridens pulchellus (Humboldt, Bonpland, and Kunth) Hitchcock, Portal.

Aegyptobia bibbyi Baker and Tuttle

Aegyptobia bibbyi Baker and Tuttle, 1964:27.

Originally described from material colleced from Atriplex canescens (Pursh) Nuttall at Yuma, Arizona, specimens have also been taken from A. lentiformis (Torrey) Watson, at Arlington, Arizona.

Aegyptobia baptus (Pritchard and Baker)

Pentamerismus baptus Pritchard and Baker, 1952:10.

Aegyptobia baptus (Pritchard and Baker), 1958:181.—Baker and Tuttle 1964:21.

This species infests a number of hosts (see Baker and Tuttle 1964). New Arizona records are; Atriplex confertifolia (Torrey and Fremont) Watson, at Marana; Chrysothamnus depressus Nuttall, at Big Lake; Artemesia ludoviciana Nuttall, at Portal; and Ambrosia confertiflora (De Candolle) Ryberg, at Winkelman.