26. 

 ATHERIX IBIS. 



Order Diptera. Fam. Rhagionidae Lat., Leach. 

 Type of the Genus A. Ibis Fab. 



Atherix Meig., Lat. Rh<\u;io Fab., Lat. Anthrax, Bibio Fah. 



Antenruc porrected, approximating, much siwrter than the head, 

 3-jointedj first and second joints nearly globose, hairy j third 

 joint transverse, semi-globose, with a long naked seta inserted 

 on the upi)er side. (f. 3.) 

 Lnbrum robust, channelled beneath. (1 . b.) 

 Tongue subulate, very acute, nearly as long as labrum. (c.) 

 Mandibles none. 



Maxill(E rather broad, attenuated, acute, as long as labrum (e.) : 

 Palpi porrected, pilose, subcylindric, '2-jointed ; first joint nearly 

 ovate ; second very long, attenudted, loiigci than the niax- 

 ills. (f.) 



Mentum robust, narrow at the base, (h.) 



Lip submembranaceousj hairy, longer than the palpi ; apex large, 

 bilobed. (g.) 

 Proboscis not so long as the head, porrected. (2.) Head hemispherical, 

 transverse, nearly as broad as thorax. Eyes large and contiguous in 

 the males, distant in the females. Stemmata 3, approximating. 

 Thorax : posterior angles slightly tuberculated. Halteres naked. 

 Abdomen conical, elongated in the males. Wings divaricating with 

 16 or 17 cells, four of which are costal ; anal cells complete. Legs 

 rather long, posterior pair in males robust. Tarsi b -jointed ; first 

 joint the Longest. Pulvilli 3. 



Ibis Fab. Fjit. Syst. Supp. p. 556. mas. Anthrax Titanus F. E. S. 

 Supp. p. 554. ]8.fem. 



Male hairy. Head black, eyes green (when alive). Thorax black, with 

 four paler lines down the back. Scutellum and first segment of 

 abdomen pure black, the three next segments dark orange, with 

 three black spots in the centre, and fuscous spots down the 

 sides ; two following segments orange, with a black band ; fol- 

 lowing joints ferruginous ; anus black. Wings slightly ferrugi- 

 nous, clouded ; costa and three transverse irregular spots fus- 

 cous. Legs yellowish. Tarsi black. Female hairy, brownish- 

 green. Head yellowish, two pale longitudinal stripes down the 

 thorax, and margins of the segments of abdomen of the same 

 pale colour. Wings larger and paler than in the male. Legs 

 yellowish. Tarsi black. 



In the Cabinets of Mr. Sleplicnx, Mr. Stonr, and the Auihoi . 



