203 © .R. Osten Sacken: 
forms a broad curve, sometimes with a stump of a vein. (Compare 
Loew, Beschr. Eur. Dipt. II, p. 57.) Loew adds that there is a 
conformity in the structure of the male forceps of these species; 
that of @. blanda I have figured 1. c. Tab. 4, f. 17. — With all 
these differences, the relationship with the typical Gonomyiae is 
evident; the most striking proof of it may be found in the structure 
of the forceps (compare 1. c. Tab. 4, f. 17 and 18, the forceps of 
@. cognatella and blanda). 
4. A remarkable deviation from the normal type of G@onomyia 
is the @. manca O. 8.1. c. IV, p. 178 from the United States. It 
seems to be a G@onomyia the anterior branch of the second vein of 
which is entirely obliterated, so that there is only one submarginal 
cell. I have seen two specimens of @. manca and a single specimen 
of another species of a similar description. The male forceps re- 
sembles those in GFonomyyia. 
5. The last group of Gonomyiae consists of G. scutellata Egger, 
G. cinceta Egger (comp. Schiner, Fauna etc. II, p. 544) and @. la- 
teralis Macaq. (S. & B. I, p. 653). They have a long auxiliary vein 
and no marginal crossvein; their color is black, with a few yellow 
spots only. Here are some notes about these species taken by me 
in collections: 
G. seutellata Egger. Discal cell closed. The venation is not 
unlike that of the N. American Gnophomyia tristissima figured in 
Monogr. etc. IV, Tab. 2, £.5 with the following prineipal differences: 
no marginal crossvein; auxiliary vein hardly reaching the proximal 
end of the second submarginal cell (at any rate not reaching beyond 
it, as in the figure); anterior branch of the fork of the second vein 
almost straight, not curved downwards; great crossvein, in some 
specimens a little before the discal cell. — This species is remar- 
kable for its large ferruginous-red forceps; the basal part swollen 
on the underside. Ovipositor very small, reddish, with nearly straight 
valves. On the pleurae, above the coxae, the male has much more 
yellow than the female; in other respects the distribution of the 
yellow spots is not unlike that in @. lateralis Macq. — The state- 
ment of Loew (Beschr. Eur. Dipt. III, p. 62) that in this species 
the marginal crossvein is very often (sehr häufig) present seems 
exaggerated: I have seen half a dozen specimens in Bellardi’s col- 
lection, all without that crossvein. Loew’s own collection in Berlin 
contains four specimens; one of them has a marginal cerossvein, but 
on one wing only. 
@. lateralis Macq. (Syn. lavolimbata Halid. apud Walk. 
Ins. Brit. Dipt. III, p. 304; manifesta Walk. List ete. I, p. 53, teste 
