40 Fa.mii.iks axi> Gkxkha ok 



large, inHatod. Neiiration variable, the veins sometiiues indititiiRt. 

 Tlie flies belonj?ing here will be readily recognized by- the hiuuli- 

 back-like shape, very small head and large tegulse. They are 

 not very common, found in sweepings, etc. Larvje, so far as known, 

 parasitic upon spiders or their cocoons. 



1. Antenna' with a terminal bristle. ...... 1 



Antennae without terminal style or bristle •"> 



2. Antenna* inserted near the vertex. . . . V >| 

 Antennie inserted near the mouth. . . . .3 4. 



8. Wings with a stout costal spur near the tip of auxiliary vein. 



Ptekodontia 



Wings without such spur; anal cell absent. ^c<«*<^ Aonoc mtA 

 4. Venation complete; eyes pilose. .... Op.sebus 



Veins more or less obsolete ; eyes bare. <^cO'Ct^.<». Ck ' W.VM 

 •5. Proboscis rudimentary C*C4^ac4X. ( »>noni.-: 



Proboscis elongate .....<; 



6. Ocelli wanting ; large flies. Lasia 



Ocelli present ; smaller flies. ..... Ei^lonchus 



AcRocEiJA Meigen, Illiger's Magaz. 1803. 



OpsEiuDS Costa, Rend, di Soc. \l. Borbon. Acad. d. Sc. V, 185(i. 



PiALOiDEA Westwood, Trans. Ent. Soc. Lond. 1876, 514. 



OcN.EA Erichson, Entomogr. 1846. 



Pterodontia Gray, Griffith's Anini. Kingd. 1882. 



EuLONCHUS Gerstfficker, Stett. Ent. Zeit. 1856. 



Lasia Wiedemann, Analecta, 1824. 



Oncodes Latreille, Precis, eti'. 154, 1796. 



LONCHOPTERID^. 



Small (2-4 mm.) slender, brownish or yellowish flies. Antenna* 

 short, porrect, third joint simple, circular, with a terminal bristle. 

 Ocelli present. Scutellum with two bristles. Legs long, short 

 bristly; pulvilli very small ; empodia wanting. Wings lancet-like, 

 pointed ; three basal cells of moderate size, of nearly equal length ; 

 fourth longitudinal vein furcate, and united with the fifth near the 

 base Lonchoi'teka 



The flies are met, often in abundance, in the grass or on the stones 

 near the margins of shady brooks. The larvae are but little known. 



LoNCMoi'TBRA Meigcu, Illiger's Magaz. 11. 272, 1808. 



