|scientific name Thrips thalictri |
Thalictrum polygomum, Thalictrum sp. (Nakahara 1994).
Body varies around 1.33mm in length and is dark brown. The bases of the fore tibiae, and the apices of all tibiae are yellow. The forewings are mainly grayish brown, but are lighter in the median part of the wing. The basal half of the wing scale is brown and the distal part is pale. The antennae are brown, with segment 3 yellowish brown except for the base and the pedicel of the segment, which is yellow. There is also a pale ring at the base of antennal segment 5. The head is broader than long and antennae are 7 or occasionally 8 segmented. Ocellar setae pair 3 is posterolaterad of the anterior ocellus. The lines of sculpture on the pronotum are weaker than those on the posterior part of the head. There are usually 4 posteromarginal setae, but occasionally there are 3 or 6. There are two anteromedial sensilla present on the mesonotum, and 2 sensilla on the metanotum. On each forewing, the forevein has 2 distal setae, although occasionally there is 1 or 3 distal setae. Females are macropterous or brachypterous while males are macropterous. There are 4 or occasionally 3 lateral setae on tergite 2. Tergite 8 has a complete comb of posteromarginal microtrichia, and tergite 9 has 1 pair of campaniform sensilla, the anterior pair is absent. Each of sternites 3 to 7 have 8 to 11 accessory setae. On males sternites 3 to 7 each have a transversely elongate glandular area (Nakahara 1994).
Alberta, Nova Scotia, Saskatchewan, Illinois, New Jersey, New York (Nakahara 1994).
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