TRIMICRA. 16T 



where the short pubescence occurs (subg. Erioptera nob.) have 

 the seventh vein arcuated, its tip being approximated to the tip 

 of the preceding vein, the third posterior cell is longer than the 

 second, showing distinctly that it is the posterior branch of the 

 fourth longitudinal vein which is forked, etc. I have before me 

 a European Erioptera of that kind (Limnobia ciliaris Schum. ?), 

 the appearance of which, at first sight, is very deceptive, as its 

 venation in most points, and its coloring, are not unlike those 

 of Trimicra. 



When I first established this genus {Proc. Acad. Nat. Sci. 

 Philad. 1861, p. 290) upon a small North American species, I 

 was not at all aware of the existence of the European T. pilipes 

 Fab., a much larger and more striking form, the true type of the 

 genus. All the characters, indicated by me at that time as dis- 

 tinctive of the genus, are to be found strongly marked in T. pilipes. 

 The genus Gnophomyia of the Fauna Austriaca {Dip)tera) is not 

 Gnophomyia 0. S., but Trimicra. 



Besides Europe and North America, Trimicra has been found 

 in Mexico, South America, South Africa, and Australia. I have 

 seen a species from Mexico in Mr. Bellardi's collection ; one from 

 Montevideo in the Berlin Museum. Limnobia hirtipes Walk. 

 (List, etc., I, p. 50), from the Swan River, Australia, and Gno- 

 p)homyia inconspicua Loew, from Caffraria (Berl. Entom. Z. 

 1866, p. 59), are Trimicrae. Dr. Schiner (Beise d. Novara, etc., 

 pp. 42, 43) describes two species from the island of St. Paul ( T. 

 antarctica and T. st. pauli), and one ( T. sidneyensis) from Sidney. 

 Those species which I have seen, although coming from distant 

 parts of the world, are very much alike in coloring. 



The name (from t?hi, three, and fiixpbi, small) alludes to the 

 small size of the terminal joints of the antennas. 



Description of the species. 



1. T. anomala 0, S. — Fuscano-cinerea, thorace lineis tribiis fuscis, 

 alls immaculatis, modice fuscescentibus ; antennis nigris. 



Brownish-gray, thorax with three brown lines, wings immaculate, some- 

 what tinged with brownish ; antennae black. Long. corp. 0.3 — 0.35. 



Syn. Trimicra anomala 0, Sacken, Proc. Ac. Nat. Sc. Phil. 18(31, p. 290. 



Brownish-gray ; vertex brownish in the middle, with a dark 

 line extended over the front ; the latter yellowish on the sides, 



