1912] Alexander — New Crane-fly from Porto Rico 63 Manaos, Brazil. One male collected by Mann and Baker, r^/pe.— Cat. No. 14579, U. S. National Museum. Ophrynopus batesianus Westwood. Ophrynopus fulvistigmus Westwood. Both from Porto Velho, Rio Madeira. (Mann & Baker.) A PECULIAR NEW CRANE-FLY FROM PORTO RICO {TIPULIDM; DIPTERA)} By Charles P. x\lexander, Ithaca, N. Y. In some large collections of Neotropical crane-flies received for study from various sources, a peculiar form was discovered which can scarcely be placed in any of the described genera and the fol-lowing new group is proposed for its reception: Megistomastix gen. nov. Antennae (See fig. 1) very long, almost twice the length of the body; first seg-ment cylindrical, short, the basal two-thirds smooth, the apical third on the dorsal aspect, with a broad depression; second segment short, irregularly cyathiform, the proximal side produced much farther cephalad than the distal side; third segment very elongate, at the base about two-thirds the diameter of segment two, rapidly narrowing to a diameter equal to one half of segment two, thickly clothed with long delicate hairs; segments four to thirteen, gradually decreasing in length, bearing the delicate hairs throughout. Rostrum without a nasus. Palpi short, none of the segments conspicuously longer than the others. Vertex produced forward into a short protuberence. Thoracic pronotum not conspicuous from above, the scutellum represented by a very narrow transverse piece; mesonotum rather de-pressed, the prsescutum sub-circular, about as broad as long. Halteres long, stem slender. Legs long, femora shorter than the tibia; tarsi very long, twice the length of the femora. Venation: Sc rather long, Sc2 entering Rs just before the origin of Rg. Ri rather long, ending opposite the fork of R2+3. Rg, very short, transverse, shorter than the cross-vein r-m. R2+3 rather long, about one-third the length of R3. R2 leaves R2+3 at an angle of about 100 \ its terminal section obliterated, represented by an indistinct spur at the junction of cross-vein r. Cross-vein r-m, long, longer than 1 Contribution from the Entomological Laboratory of Cornell University.
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