. Monographs of the Diptera of North America [microform] / prepared for the Smithsonian Institution by R. Osten Sacken. Diptera; Insects; Diptères; Insectes. TIIICIIOCERA. nt rest, are porrected, slijjlitly iiirliiietl towards cacli otlier, U-av- iiifj a coiisi(l('ra))l(.' ojn'ii space betwooii tliciii. The uvipusitur of tlio feinalo is distiiiji-iiislied from all the ovipositors of the Tiiiiili(l»- by iK'iiig rt'vcrsod; tliat is, having the convex side of tJK! arcuated valves above and tlie concave side below.' The Trivhocerue appear in swarms during suni'y autumn and winter days; thei
. Monographs of the Diptera of North America [microform] / prepared for the Smithsonian Institution by R. Osten Sacken. Diptera; Insects; Diptères; Insectes. TIIICIIOCERA. nt rest, are porrected, slijjlitly iiirliiietl towards cacli otlier, U-av- iiifj a coiisi(l('ra))l(.' ojn'ii space betwooii tliciii. The uvipusitur of tlio feinalo is distiiiji-iiislied from all the ovipositors of the Tiiiiili(l»- by iK'iiig rt'vcrsod; tliat is, having the convex side of tJK! arcuated valves above and tlie concave side below.' The Trivhocerue appear in swarms during suni'y autumn and winter days; their larvie live in decaying vegetable matters, and have been described and figured by I'erris {Ann. Hue. J'JnIoni. de France, 2c sor. A'ol. V, 1«47, page 37 ; Tab. I, No. III). The pubescence of the eyes is a character which, so far as observed, belongs among the TijmlUhv, to the Amahpina alone. I'richdcera is the only exception. Further, this genus, and i)er- liaps also Pedicia, seem to be the only ones among the Tiiinlidnf, wiiieli have ocelli. Trich"era is, moreover, abumlantly dis- tinguished by the position of the great cross-vein, at the further end of the discal cell, the course of the seventh longitudinal vein, the flat depression between the thoracic suture and the scatellum, and the structure of the ovipositor. Neverthele^»^, its position among the LimnophiUna has nothing unnatural. The structure of the forceps alone would be sufficient to separate Trichocera from the Av'lopina, whicli always have a strong, branched horny forceps. Trichocera is represented by five s})ecies ill Europe. Only one species ( T. ocellaia Walk. Dipt. Saunders. p. 483 ; East Indies) from any other part of the world, besides America, has been described. Two fossil species have been found by Mr. Locw, in th'j Prussian amber (Loew, Bcrnst. u. Jlern- steinfauna, p. 37); t ey are very like the p]uropean species, and show only slight diifo/Cnces in the venation. The nan e is from tp
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