272 TIPULTD^E. 



Genus II. , ANISOMERA. 



ANISOMERA, Hoffm. Meig. Zw. i. 210 (1818); Mcq.; Zett. Hexa- 

 toma, Latr. ; Lam. Perenocera t Curt. 



Corpus elongatum, mediocre, subkeve. Caput rotundum, sessile ; frons 

 latissima. Oculi parvi, oblongi, remoti. Proboscis brevis. Palpi 

 4-articulati, exserti, incurvi; articuli aequales. Antennae 6-articu- 

 latae, porrectae, subfiliformes ; articulus primus cylindricus ; secundus 

 cyathiformis ; tertius et sequentes setacei, subpubescentes, hie longus. 

 Prothorax brevissimus. Thorax sat convexus. Scutellum mediocre. 

 Metathorax brevis. Alae incumbentes, mediocriter Iata3. Abdo- 

 men elongatum, segmentis octo. Pedes longiusculi, sat graciles, 

 inermes, fere uudi ; coxae breves ; tibiae posteriores calcaribus brevis- 

 simis. Mas. Antennae longiores. Abdomen apice obtusum, forcipe 

 brevi. Fcem. Antennae breviores. Abdomen stylis analibus rectis 

 parvis. 



Body elongated, dull, nearly smooth, of moderate size. Head round, 

 sessile ; front very broad. Eyes small, oblong, remote. Proboscis 

 short. Palpi four-jointed, exserted, curved downward ; joints of equal 

 size. Antennae six-jointed, porrect, subfiliform ; first joint cylindrical ; 

 second cyathiform ; the following joints setaceous, minutely pubescent, 

 the third long. Thorax moderately convex. Prothorax very short. 

 Scutellum of middle size. Metathorax short. Wings incumbent, long, 

 lanceolate, rather narrow ; mediastinal vein ending at a little before or 

 beyond two-thirds of the length of the wing. Subcostal ending at four- 

 fifths or five-sixths of the length, connected with the radial by a trans- 

 verse veinlet from the angle close to its tip ; radial and cubital spring- 

 ing from a common petiole, which nearly or quite equals them in length, 

 and proceeds from the subcostal at more or less before half the length 

 of the wing, and forms an angle close to its base ; cubital connected at 

 one-fourth of its length with the externo-medial by a transverse veinlet, 

 the middle of which emits another externo-medial, and in a line with it 

 there is a veinlet between the externo-medial and the subanal, where the 

 latter forms an angle to the hind border ; anal and axillary complete ; 

 no discal areolet. Halteres of moderate length. Abdomen elongated, 

 with eight segments. Legs moderately long and slender, nearly bare, 

 unarmed ; coxae short ; posterior tibiae with very short spurs. Male. 

 Antennae longer. Abdomen obtuse at the tip, with a short forceps. 

 Fern. Antennae shorter. Abdomen with straight short anal styles. 

 Inhabits the banks of rivers. The larva lives in mud. 



a. Antennae of the male as long as the body ; of the female half the 



length of the thorax. Species 1. 

 a a. Antennae of the male hardly more than half the length of the thorax; 



of the female less than half the length of the thorax. Species 2. 



1. nigra, Latr. Gen. Curt. iv. 260 (1809); Lam.; Mcq. Nigra, 



