oe 
THE BIBIONID.#&. 155 
to be true genera; the latter naturalist unites the species of Heer’s 
two extinct genera to Plecia. The genus Penthe/ria, Mg., also seems 
to be represented in a fossil state at Aix. 
Lestremia, Mg. 
GENUS Anarete = { ‘ 
Sctara, Zett. 
Head semicircular, small. Ocelli three. Proboscis projecting ; 
palpi 4-jointed, the last joint not longer than the others, Antenna 
short, g-jointed, hairy; first joint large, second larger than third. 
Abdomen 7 to 8 jointed; ¢ genitalia sometimes large and project- 
ing. Wings longer than the abdomen, bare ; third and fifth longitu- 
dinal veins simple; fourth forked; first simple. Legs slender, 
femora thin ; tibiz slender, without spurs. Fig. 3, Pl. iii. 
A. candidata, Hal. 
A. albipennis, Mg. = | L. albipennis, Mg 
Black, shiny ; antennz pale black. Legs yellowish, in the f some- 
what longer than in the ? ; hind tibize and tarsi white. Wings milky ; 
veins pale, except the costal and sub-costal, which are tawny in living 
specimens. Length 1 lin. Rare. 
Tipula, L. F. Deg. 
Certa, Scop. 
GENUS Scatopse, Geoff. = | Aspistes, Ruthé. 
Hirtea, F. Mg. et Zett. 
Body small, long and shiny. Head roundish, narrower than 
thorax. ‘Thorax convex, hairy; scutellum small. Abdomen with 
7 or 8 segments, depressed ; extremity of 2 truncate (generally), the 
¢ genitalia usually distinctly visible. Legs comparatively short and 
somewhat thick ; anterior femora distinctly thickened, tibize unarmed. 
Palpi very short, hidden ; the last joint appearing large, and almost 
seeming as if the palpi were one-jointed. Proboscis slightly project- 
ing. Antenne 1o-jointed ; second joint long, cup-shaped ; last juint 
elongated, oval ; middle joints short, transverse. Wings long, broad, 
bare; longer than abdomen. Fig 4, PI. iii. 
The larve, which are long, fusciform, apodous grubs, live in 
decaying vegetable matter and human excreta, sewers and open 
drains. They are terminated by two elongated divergent seta 
