146 SIMULlDJi. 



OceUi none. Scutnin of the viesothorax undivided. Wings and 

 halteres coynplete. Costal vein ending near the tip of the wing. Tibice 

 and metatarsi broad, compressed. 



This Family comprises ooly one genus. 



Genus I. SIMULIUM. 



SiMULiUM, Latr. Hist. Nat. Ins. (1802); Mcq.; Heeger. Culex p., 

 L. ; F. E. S. ; Schr. ; Gmel. Tipula p., D. G. ; F. E. S. Scatopse 

 p., F. S. A. Chironomus p., F. S. A. Atractocera, Meig. Kl. Z\v. 

 Simulia, Meig. ; Fries ; Zett. 



Corpus parvum, oblongo-ovatum, gibbum, opacum, tomentosum. Ca- 

 put parvum, tborace angustius et bumibus. Ocelb nulli. Palpi 4- 

 articulati, exserti, incurvi ; articulus primus parvus ; secundus et ter- 

 tius longiores ; quartus adbuc longior, nudus, gracilis, quasi articu- 

 latus. Antennae 11-articulatpe, porrectfe, subuiouibformes, subcyliii- 

 dricfe, apices versus subangustata), capita nonniiiil longiores ; articuli 

 primus et secundus discreti ; tertius et sequentes contigui, trans- 

 versi, subcyathiformes. Thorax ovatus. Alse amplse, incumbentes, 

 nudse, hyalina^. Halteres distincti. Abdomen 8-annulatum, sub- 

 cybndricum. Pedes validiusculi, comprcssi, inermes, metatarso 

 postico longiusculo. Mas. Corpus plerumque atrum, aureo aut albo 

 ornatum. Oculi magni, rotundi, in fronte arete contigui. Palpi 

 parvi. AntenucC in fronte antico approximatse Abdomen subcyliu- 

 dricum, subincurvum. Metatarsus posticus incrassatus. Foem. Cor- 

 pus plerumque cinerascens. OcuU mediocres, reniformes, remoti. 

 Labrura lanceolatum. Labium lineare, apice rotundatum et biden- 

 tatum. Lingua clongata, fissa, apud medium contracta, extus apicem 

 versus ciliata. Palpi majusculi. Antennae in incisuris ocellorum 

 insertse, nonniiiil remotae. Abdomen oblongum, crassum, rectum. 

 Metatarsus posticus vix incrassatus. 



Body small, oblong-oval, gibbous, opaque, tomentose. Head small, 

 narrower and lower than the thorax. Ocelli none. Palpi four-jointed, 

 exserted, curved downward ; first joint small ; second and third longer ; 

 fourth still longer, slender, bare, composed of numerous little aunuli. 

 Antennae eleven-jointed, porrect, submoniHform, nearly cylindrical, 

 somewhat narrower towards the tips, a little longer than the head ; 

 first and second joints remotely connected ; third and following closely 

 connected, transverse, nearly cyathiform ; eleventh elongate, conical. 

 Thorax oval. Wings ample, incumbent, bare, hyaline ; costal, medi- 

 astinal, radial, and cubital veins stout; the rest slender, indistinct; 

 costal vein ending at little in front of the tip of the witig ; subcostal 

 and mediastinal ending at very little beyond half the length ; radial 

 ending at a little before two-thirds of the length ; cubital joining the 

 tip of tlie costal ; subapical double, springing from the cubital before 

 half the length of the wing; the first division ending at the tip of the 

 wing, the second joining the hind border; two cxtenio-niodial veins. 



