314 CLASS VIII. 



Sp. Ornithomyia hirundinis, Hippol. hirundinis L., Stenopt. hirundinis 

 LEACH, MEIG., GUKKPN Iconogr., Insect. PI. 104, fig. 7 : on the common 

 Swift, Cypselus murarius. 



Strebla WIEDEM ANN. Eyes very small, triangular. Ocelli 1 Wings 

 incumbent, ro tun date, longer than the abdomen, with parallel 

 veins. 



Sp. Strebla vespertilionis WIEDEM., Aussereurop. ziueiflug. Ins. u. Tab. x. 

 fig. 13 ; on a bat of South America. 



Hippobosca LATR. Nirmomyia NlTZSCH. (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. ed. illustr., Ins. PI. 182, fig. i; 

 PANZER, Deutschl. Ins. Fasc. 7, Tab. 23 ; GURLT, Magaz. f. d. gesammt. 

 ThierJieilk. IX. 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 REAUMUR has recorded. M&n. pour servir a I' Hist, des Ins. 

 vi. pp. 569608. PL 48. 



Sub-genus Olfersia WIEDEM. (Feronia LEACH.) 



Family X. Athericera. Antennae 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 Athericera (from adrjp, spica, arista), aristate or awned 

 antennae, 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 Eristalis 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 



