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. 



