12 DIITKKA 



10. Genus CHONOCEPHALUS, Wandolleck 



Chonocephalus. \\'.iiul(ill('ck. Zofjl. Jahib. Ahlli. Syst. \'ol. ii, p. 4-;.S (i.SyS). 



Characters. — Malc Sinall. slender species. ilead latlicr tlatteiieil aiiterci-iiosteriorK . Front 

 narrow, sideb of tlie tVnni each with a single vertical r(nv ol" five pioclinate bristles. Ocellar tubercle 

 present. surrounded by three small macrochaetae. Thorax narrowed behind, its cliaetota.\y as usual. 

 Abdomen slendei . Lej<s slender, haiiy. I>ul not bristl\ except for a siiigle weak spur on each posterior 

 tibia. Pulvilli and empodia absent. Wings ver\ laij;e strongly inicioscopically hair^ , costa not bristly. 



Female. Entirely wingless. Hcad with very sinall eyes and no ocelli. 'rhorax small, widei than 

 the head, but extremely short. .Vbdomen elliptical, with six strongly chitinized dorsal plates which 

 extend far dow n on the sides. Sixth vential plate also present, almost ineeting the sixth dorsal. 



The inalc of this anomalous genus ina\- be iecot;iiizc(i at oiice by tlie h,-iiry wiiij^s. The wingless 

 female is very degenerate. 



Type species : C. cinisalis. Wandnllcck. 



Geographical dlstributlon of species. — ( )nl\ two species are know n, liotli froin the far east, 



1, C, dorsalis, WandoUeck, Zool. Jahrb. .Abth. S\st. \'ol. n, p. 421^ (i.SqS) (iiismark Archipelago), — 



Piate 2, Fig. 15. 



2, C, simiiis, liiiics, Anii. Mus, .\at. Hiing. \dl. j. p. 554 '.")"-'') (lioinbay, liidia). 



I I. Genus SYNEURA, Brues 



Syneura. liiiics, 'l"iaiis. Amer. luit. Soc. \'ol. .:(). p. i^.i inyo^l. 



Characters. — lio(l\- shorl and stoiit. Ilead ratlici llatlcned; the froiit lon;;, with ncai iy paiallel 

 sides: three rows of reclinalc bi istles besides foui anteiioi proclinate oncs, Third joint ot antenna slightiy 

 ovai, moic p(jinted apicalK , witli a doisal arista, l^alpi bristly below . i"horax very large and broad. 

 .•\bdomeii small. ovipositei of fcmaie soft and fleshy. Legs veiy stout, especially the iiind pair. the femora 

 of which are extra(jrdinaril\- tliickened. Middle tibise baie. witii a single apical si)Lii. ilind tibia- thick- 

 ened, setulose. w ith two stoui spurs. \\ ings smalL thc costal vein vei y shoit: liisl \ciii ending very 

 close to the thiid. wliich is smiplc C osta l)iistl\. foui liiiht \eins. mediaslmal vein waiitmi;. Fmipodia and 

 pillvilli small. biil (listnicl. 



Geographical distrlbutlon of species. Unly a sin,t;lc spccics has l)eeii dcsciibed. 

 I. .S". ciiccipliiLt. t o(|uillcti, t aiiad. iMitom. \ol. j/. \>. io() 'tS()5'. Piate I, Fig. 7. 



12. Genus METOPINA, Macquart 



Metopina. M.ic(iuart. Hist. Nai. Dipt. Vol. 2, p. W)f) (iS^Si. 

 Drepanophora. Strobl, i''niide ani Seitenst (i.S.Soi, 

 Leptophora, Six, Tijdsciir, \. l^nt. Vol. ji, p, iSd iiS^.Si. 



Characters. — Smali slender species, Front with iiot moic ihaii two transveise rows of four 

 bristles above, on the anterior edge with foui proclinatc bristics. 'i^iiorax smail, the dorsocentral macro- 



