198 C. R. Osten Sacken: 
Gnophomyia. 
OÖ. Sacken, Proc. Acad. N. Sc. Philad. 1859; Monographs etc. IV, 
p. 172, Tab. 2, £.5, wing; Tab. 4, f. 19 and 19a, forceps and 
ovipositor 1). 
In my above-quoted publications G@nophomyia is represented by 
two species, belonging to two slightly different types of structure. 
I. @. luctuosa from North-America, together with Limnobia 
nigrina Wied. A. Z. I, p. 37 and Limnobia rufithora® Wied. ]. c. 
I, p. 548, both from Brazil, belong to the first group, distinguished 
by a more robust stature, short, almost subglobular joints of the 
flagellum, with short verticils, stouter legs ete. For L. rufithora® 
Mr. Jaennicke (Neue Exot. Dipt. p. 10, Tab. 1, f. 1, 1567) introduced 
the new genus Zurina (preocc. Dumer. Rept. 1353), prineipally based 
on the presence of a supernumerary crossvein in the second submar- 
ginal cell, which is a character of very inferior value. The number 
of joints of the antennae is not mentioned in the description, but 
they are represented as eleven-jointed on the plate. The type-spe- 
cimen, which I have seen in Frankfort, has the tip of the antennae 
broken off; specimens which I saw in the British Museum have the 
normal number of 16 joints. A species from Australia, which I de- 
scribe below, may be referred to this group. Limnobia elegans 
Wied. A. Z. II, p. 617 from the Cape likewise belongs here; perhaps 
also Z. stupens Walk. Trans. Ent. Soc. Lond. N. Ser. V, p. 332 
(Mexico), the type of which in the Brit. Mus. is a mere fragment. 
II. The second group is represented by @. tristissima O. S. 
from North-America, the type of structure of which is exactly repro- 
duced in the following species: 
1. Limnobia sylvatica Meigen, Syst. Beschr. I, p. 132 (Ger- 
many). I have seen a specimen from Loew’s collection, now in the 
Berlin Museum; it has the same venation as @. tristissima (mar- 
ginal crossvein present), and the same structure of forceps and ovi- 
positor. 
2. Limnobia viridipennis Gimmerthal, Bullet. ete. de Moscou, 
1847 (from Curland). Mr. Bigot showed me a specimen from France, 
which very probably belongs to this species. It differs from L. syl- 
1) At the time when I wrote my Monograph, I had never seen 
a Psiloconopa and misunderstood its systematie position; hence, my 
statements about it in that work must be struck aut: on page 173 the 
paragraph beginning with the words: A genus closely allied ete. and 
ending near the bottom of p. 174 before the words: Description 
of the species, 
