250 CULICID.F.. 



Genus IV CORETHRA. 



COKETIIRA, Meig. Illig. Mag. (1803); Latr. ; Panz. ; Meig.; Stepli. ; 

 Mcq. ; Zett. ; Gim. ; Staeg. ; Westw. Tipula p., L. ; F. E. S. ; 1). G. ; 

 Gmel. ; Meig. Kl. CJtironomus p., F. S. A. Tanypus p., Lain. 



Corpus mediocre aut parvuin, elongatum, pubescens. Caput parvurn, 

 sessile. Oculi transversim lunati, suhremoti. Os parvuin, subelon- 

 gatum. Proboscis antennis multo brevior. Palpi 4-articulati, cylin- 

 drici, pubescentes, incurvi, articulus primus brevis. Antemue 14- 

 articulatae, porrectse, filiformcs, thoracis longitudine. Thorax longi- 

 ovatus. Scutellum mediocre. Alse angustae, pubescentes, incum- 

 bentes, squamis ciliatae, abdomine paullo breviores. Abdomen scg- 

 mentis 8, gracile, elongatum, pilosum. Pedes graciles, pubescentes, 

 inermes, sat longi. Mas. Antennae verticillato-pluraosae. Abdo- 

 men apice valvulis duabus foliaceis subincurvis sat longis instructum. 

 Fcem. Antennae verticillato-pilosae. Abdomen apice hamulis duobus 

 brevibus instructum. 



Body of moderate size, elongate, pubescent. Eyes transversely lu- 

 nate, separate in both sexes. Mouth small, slightly elongate. Pro- 

 boscis much shorter than the antennas, with two apical clavate appen- 

 dages. Palpi four-jointed, cylindrical, pubescent, shorter than the an- 

 tennas ; first joint shorter than the others. Antennae fourteen-jointed, 

 porrect, filiform, as long as the thorax. Thorax elongate-oval. Scutel- 

 lum of moderate size. Wings narrow, pubescent, a little shorter than 

 the abdomen, incumbent during repose ; veins fringed with scales ; me- 

 diastinal vein ending at about half the length of the wing ; subcostal 

 ending at full five-sixths of the length ; radial springing from the sub- 

 costal at before half the length of the wing ; its two forks ending at 

 the tij) of the wing ; cubital proceeding from the praebrachial transverse 

 veinlet ; subapical forked towards its tip ; praebrachial, subanal, and anal 

 complete; posterior margin excavated at the base. Abdomen slender, elon- 

 gate, hairy, with eight segments. Legs slender, moderately long, pilose, 

 unarmed ; fore pair not remote from the others ; coxae of moderate size ; 

 ungues very small ; onychia almost obsolete. Male. Antennae verticil- 

 late-plumose, the whorls from the base to the tips successively decreas- 

 ing in length. Abdomen with two apical, slightly curved, foliaceous 

 appendages, nearly as long as one of the segments. Fern. Antenna? 

 verticillate-pilose ; hairs short and few. Abdomen with two little 

 apical curved hooks, which are not longer than a quarter of one of the 

 segments. 



"The larva of Corethra plumicornis is so beautifully transparent 

 as to resemble a piece of crystal, and scarcely to be distinguished 

 from the water in which it lives. It is vermiform, very long, 

 with rather thicker thoracic segments. The head is small, co- 

 nical, turned upwards, furnished with two deflexed hooks, which 



