. Monographs of the Diptera of North America [microform] / prepared for the Smithsonian Institution by R. Osten Sacken. Diptera; Insects; Diptères; Insectes. AMALOPINA, 259. Section VI. AMALOPINA. Two snbmarginal cells ; four or five posterior cells ; discal cell closed or oiieii; siilici>.--tiil cross-vi in far reuioveil from the tip of the auxiliary vein ami autirior ta the origin of thn second Itiuijituilinal riin (Tab. II, lig. 14-18). Tibi;e with spurs at the tip ; euipodia distinct. J^ijas pubfisrent: front usually with a more or less distinct gibbosity. Normal iiuiuber of autenual jo
. Monographs of the Diptera of North America [microform] / prepared for the Smithsonian Institution by R. Osten Sacken. Diptera; Insects; Diptères; Insectes. AMALOPINA, 259. Section VI. AMALOPINA. Two snbmarginal cells ; four or five posterior cells ; discal cell closed or oiieii; siilici>.--tiil cross-vi in far reuioveil from the tip of the auxiliary vein ami autirior ta the origin of thn second Itiuijituilinal riin (Tab. II, lig. 14-18). Tibi;e with spurs at the tip ; euipodia distinct. J^ijas pubfisrent: front usually with a more or less distinct gibbosity. Normal iiuiuber of autenual joints sixteen or thirteen. Tlio Tipulidie of this section form two natural groups, based upon tlic nuinl)er of joints of their antennie, and the i)eculiaritie3 of their venation. PeiJivia n\\(\ Amalopis have Ifi-jointcd antonnte ; tlie second sul)Hmrginal cell is (in all cases which came nnder my observa- tion) never longer, although generally l)ut vi'rv little shorter, than the lirst posterior cell; the priefurca is I'ather elongated (Tab. II, fig. 14, 15) ; the palpi seem to be usually longer than in the follow- ing group. Divrcmota, BhniihidoUiJyin, and riccfromijin have 13-jointed nntennje; the second sul)niarginal cell is never shorter than the first posterior, generally a little longer ; the pra^furea is very short (Tab. II, fig. 16-18; for more details concerning the differences hetwccMi these two groups, compare the genus Anuilopix). The characters common to the two groups, and at the same time distinctive of the Amalopina are : the position of the snl)- costal cross-vein ; the pubescent eyes ; the fretjuent occurrence of the frontal gibbosity ; the freipient absence of the discal cell, especially in the second gr(Hip ; tli<' peculiar shape of tlie penulti- mate posterior cell (compare Tal». II, lig. 14-lS), the inner end of which is alwa3-s nnieh more extended inwards than in the ninjiirity of the brevipnipoiis 'Ti/'xliihr. This character, impart- ing '.i pcMitagon
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