Abstract
Two new species of the genus
Eutetranychus
Banks are described and illustrated based on adult females and males,
E.
spinosus
sp. n.
from
Indigofera
spinosa
Forssk (
Leguminosae
),
E.
neotransversus
sp. n.
from
Juniperus
procera
Hochst. ex Endl. (
Cupressaceae
), and
E.
palmatus
Attiah, 1967 is redescribed from
Washingtonia
robusta
H. Wendl. (
Arecaceae
). Additionally, the intraspecific morphological variations within
E.
orientalis
populations, collected from 28 various host plants and 80 different localities from six regions of Saudi Arabia from 2009 to 2017, are discussed and presented. The genus
Eutetranychus
is divided into two species groups based on the presence of one seta (
orientalis
group) or two setae (
banksi
group) on coxa II. In addition, seven
Eutetranychus
species are suggested as synonyms of
E.
orientalis
(Klein, 1936) and
E.
papayensis
Iqbal & Ali, 2008 is considered as species inquirenda. A key to all known species of the genus
Eutetranychus
is provided.