376 M. F. Meinert on Mochlonyx (Tipula) 
his classical work, ‘ Systematische Beschreibung der bekann- 
ten europiiischen zweifliigeligen Insekten’ (1818, Th. i.), 
Meigen left the insect in the same systematic position (J. ¢. 
p- 16) ; but here he states that he had not seen the animal, for 
which he reproduces De Geer’s diagnosis, which, after generic 
characters were cut out, comes to run as follows in the Latin 
translation :—“ Fusca, abdomine pedibusque griseis.” 
Henceforward De Geer’s Tipula culiciformis bears the 
generic name Corethra, and under the denomination of Core- 
thra culiciformis we meet with it both in general manuals, 
such as Cuvier’s ‘Régne Animal’ (ed. i. 1829, tome v. 
p: 441), where this species alone is named in the genus 
Corethra, and in special entomological systems and text-books, 
as in Latreille’s ‘Genera Crustaceorum et Insectorum’ (tome iv. 
1809, p. 247), where C. culiciformis, Meigen, is cited, with a 
reference to De Geer, as the type species, while Réaumur’s 
and Slabber’s Tipularva (= C. plumicornis) are referred to it 
with some doubt (‘‘pertinere videntur’’). In Kirby and 
Spence’s ‘Introduction to Entomology’ (vol. i. 1817, 
p- 322, German translation), in Westwood’s ‘Introduction to 
the Modern Classification of Insects’. (vol. 11. 1840, p. 515), 
and in the regular systematic and faunistic works on the 
Diptera also, Corethga culiciformis is named again and again ; 
nay we even find a detailed description and figures of a species 
so named. It is Lehmann * who has described and figured a 
male Corethra as the C. culici/formis cited but not seen by 
Meigen. It is not, however, De Geer’s Tipula culiciformis 
that he describes, but probably the Corethra fusca established 
by Steger. 
Subsequently doubts began to arise as to the correctness of 
the reference of Zipula culiciformis to Corethra, or more pro- 
perly to Corethra with Tipula plumicornis, Fab., as its type. 
Steger may be named as the first who expressed this doubt. 
In his ‘f Systematisk Fortegnelse over de 1 Danmark hidtil 
fundne Diptera” (Naturh. Tidsskr. Bd. 11. 1838-39, p. 556) 
he established a new species, Corethra fusca, and referred to 
it doubtfully Meigen’s and Macquart’s Corethra culict- 
Jformis (=Tipula culiciformis, De Geer). He speaks as 
follows :—‘ This species may perhaps be Corethra culict- 
formis, Meig., Macq.; but the Tipula culiciformis, De Geer, 
cited by these authors, the larva of which is figured in the 
* “Tnsectorum species nonnull vel nove vel minus cognitz, in agro 
Hamburgensi captee, ex ordine Dipterorum. Descripsit et illustravit 
J. G. C. Lehmann,” Nova Acta Acad. Cees. Leop. Catal xii. (1825), 
p. 2. 9-248, tab. xv. Reprint of ‘Zoologicarum preesertim in faunam 
Jamburgensem observationum pugillus primus’ (1822), pp. 38-46, 
eae 
