314 CLASS VIII. 
Sp. Ornithomyia hirundinis, Hippob. hirundinis L., Stenopt. hirundinis 
Leacu, Muia., Gutirin Iconogr., Insect, Pl. 104, fig. 7: on the common - 
Swift, Cypselus murarius. 
Strebla WiEDEMANN. Eyes very small, triangular. Ocelli? Wings 
incumbent, rotundate, longer than the abdomen, with parallel 
veins. 
Sp. Strebla vespertilionis WiEDEM., Aussereurop. zweiflug. Ins. 11. Tab. X. 
fig. 13; on a bat of South America, 
Hippobosca Later. Nirmomyia Nrrzscu. (Species of Hippobosca 
L.) Eyes distinct, large; ocelli none. Wings parallel, incumbent, 
obtuse, multinervose. Tarsi with bidentate claws. 
Sp. Hippobosca equina L., Cuv. R. Ani. éd. alustr., Ins. Pl. 182, fig. 1; 
Panzer, Deutschl. Ins. Fasc. 7, Tab. 23; Gurut, Magaz. f. d. gesammt. 
Thierheilk. 1X. Tab. I, figs. 13, 14; mouche Bretonne, mouche d Espagne, 
Pferde-laus, Forest-fly ; thorax dark-brown, spotted with yellow ; abdomen 
brown-grey, hairy. This species sucks the blood of horses, and attaches 
itself especially to the belly and the inside of the hind legs. 
If we were told that a bird laid an egg that produced a young one as 
large as the mother, we should think the account fabulous and ridiculous ; 
the fabulous part would not be diminished were the bird ever so small or 
even a winged insect. Of this insect however the story is accurately true. 
Let the reader consult the beautiful and circumstantial natural history of 
this fly which R&auMUR has recorded. Mém. pour servir a UV Hist. des Ins. 
VI. pp. §69—668. Pl. 48. 
Sub-genus Olfersia WrEDEM. (Meronia LEAcu.) 
Family X. <Athericera. Antenne with two joints or three, the 
last undivided, and presenting the form of a patella or capitulum, 
and in most supplied with a seta or spicate appendage. Proboscis 
retractile or slightly prominent, with haustellum composed mostly 
of two, sometimes of four seta; in some the mouth is closed, with 
tubercles in place of proboscis. | Pupa coarctate. 
The name A thericera (from aOyp, spica, arista), aristate or awned 
antenne, expresses the character by which this family of Diptera is 
distinguished. The larva has in this and the following family a soft, 
ringed, somewhat conical, anteriorly pointed body. Progression is 
effected by extension and contraction of the body, whose form is 
very variable. On the whole the larva does not change its skin, and 
has no feet; in that of Helophilus and Hristalis alone are there 
seven pairs of membranous feet provided with small hooks, on the 
body beneath, which is the only example of such appendages in this 
fe 
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