. Monographs of the Diptera of North America [microform] / prepared for the Smithsonian Institution by R. Osten Sacken. Diptera; Insects; Diptères; Insectes. ERIOPTEUINA, 137 Besides the cliaractors of tlie Erioplerina wliiV-h have ah'cady l)('('ii oiiumoratcd, there is one which deserves to he ineiitioned here. In this group of TipuUdx the anterior l)raiH'h of tlie fourth longitudinal vein is quite frequently forked, while the jiofttrrior branch is sinq)!e, and thus, when the discal cell is open, it coalesces with the third and not with the second posterior cell. AVc find this structure in tw
. Monographs of the Diptera of North America [microform] / prepared for the Smithsonian Institution by R. Osten Sacken. Diptera; Insects; Diptères; Insectes. ERIOPTEUINA, 137 Besides the cliaractors of tlie Erioplerina wliiV-h have ah'cady l)('('ii oiiumoratcd, there is one which deserves to he ineiitioned here. In this group of TipuUdx the anterior l)raiH'h of tlie fourth longitudinal vein is quite frequently forked, while the jiofttrrior branch is sinq)!e, and thus, when the discal cell is open, it coalesces with the third and not with the second posterior cell. AVc find this structure in two North American Erioptcra' (/v. caloplcra Say, and pnrva O. S.), three North American and several European lihi/pholopJiiis; in all the Ooniomijia', wiiich have no discal cell, and in the European Pxiloconopa lalrralifi Mac(j. (flavolimbata Hal.). Among the other Tipulida: this structure is rare (compare the Introduction, page 33). I am not aware that any genus of Eriopferina, foreign to Euroj)e and North America, has been published, unless Lachnotrra IMiilippi ( Fcr/t. Zool. Bat. Ges. in Wien, 18(15, p. filf), Tal). XXIII, ;)), from Chile, belongs here. The venation of this genus is not uidike that of Goniomyin; it also reminds of a Limnophila with four posterior cells. The statements of the author are not. com- plete enough to admit of any certain conclusion. The translation of the description is given in the The following new genus, from Mexico, is in Mr. JJellardi's collection, in Turin :— Sigmatomera, nov. gen. (from aiyfia, the letter s, and jui'poj, part). Two sabmarginal cells, four posterior cells, and a discal cell; the tip of the auxiliary vein is not much beyond the basis of the second sub- marginal cell; the subcostal cross-vein is at a luoiierate distance from tliis tip; tibia) without apparent spurs; empodia small; antenna; (%) 16-joiiited, more than once and a half the length of tJie liea. and the tlioias taken together; joints suhrenifo
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