146 SIMULID;E. 



Ocelli none. Scutum of tJie mesothorax undivided. TPings and 

 halteres complete. Costal vein ending near the tip of the wing. Tibia 

 and metatarsi broad, compressed. 



This Family comprises only 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, opacnm, tomentosum. Ca- 

 put parvum, thorace angustius et humilius. Ocelli nulli. Palpi 4- 

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

 tius longiores ; quartus adhuc longior, nuclus, gracilis, quasi articu- 

 latus. Antenna? ll-articulataj, porrectaB, subraoniliformes, subcylin- 

 drica?, apices versus subangustataB, capite nonnihil longiores ; articuli 

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

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

 nudse, hyalhue. Halteres distincti. Abdomen 8-annulatum, sub- 

 cylindricum. Pedes validiusculi, compressi, inermes, metatarso 

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

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

 parvi. AntennaB in fronte antico approximate Abdomen subcylin- 

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

 pus plerumque cinerascens. Oculi mediocres, reniformes, remoti. 

 Labrum lanceolatum. Labium lineare, apice rotundatum et biden- 

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

 versus ciliata. Palpi majusculi. AntennaB in incisuris ocellorum 

 insertaB, nonnihil remotaB. Abdomen oblougum, 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 annuli. 

 Antennas eleven-jointed, porrect, submoniliform, 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 cyathifonn ; 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 wing ; 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 the costal ; subapical double, springing from the cubital before 

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

 wing, the second joining the hind border; two cxtcnio-medial veins, 



