Trachys problematicus Oberberger, 1918

Trachys problematicus: occupied mine

occupied mine (from Kwast)

mine

Full depth, transparant blotch. Oviposition site covered by a shining black drop of hardened secretion. Frass in granules or thread fragments. Pupation in the mine, pupa not in a cocoon.

host plants

Lamiaceae, monophagous

Stachys annua, germanica, recta.

S. recta seems the most important host plant). Bilý (2002a) also mentions Mentha, but this may be due to confusion with T. scrobiculatus.

phenology

Larvae in June-July (Hering, 1957a).

BENELUX

BE not recorded (Fauna Europaea, 2007).

NE recorded (Fauna Europaea, 2007), but there are no Dutch records to support this.

LUX not recorded (Fauna Europaea, 2007).

distribution within Europe

From Germany to Russia and Bulgaria (Fauna Europaea, 2007).

larva

Described by von Frauenfeld (1864a, as T. pumila).

pupa

von Frauenfeld (1864a).

notes

Also on Stachys mines Trachys quercicola, and Hering (1957a) suggests that the two might have a subspecific relationship. The distribution patterns certainly supports Hering’s idea, but the Fauna Europaea (2007) treats them as two independent species.

references

Beiger (1960a, 1979a), Bilý (2002a), Brechtel & Kostenbader (2002a), von Frauenfeld (1864a), Hering (1930a,b, 1957a), Kwast (2013a).

mod 4.ix.2019