562 MODERN CLASSIFICATION OF INSECTS. 
Athericera by having the proboscis distinct, short, thick, membrana- 
ceous, terminated by two large labial lobes, and entirely retractile 
within the oral cavity, enclosing only two internal setiform organs *, and 
a pair of palpi+ (jig. 131. 15. head and mouth of Musca); the antennz 
are triarticulate, the third joint being the largest, and furnished with a 
dorsal seta, chetum, or arista, sometimes articulated at the base (fig. 
131.14. antenna of Echinomyia); the body is generally short and 
robust, and the legs and wings of moderate length; the nerves of the 
latter are much fewer in number than in the Syrphide, and extend to 
the posterior extremity of the wings; the abdomen is not inflected at 
the extremity. 

Borners. Beschr. der Schadl. Gerstenfliege Musca Tritici, in Nachricht d. Schles. 
Patriot. Gesellsch. p. 55. 
Bjerkander, Fist. of various obnoxious species, in Vetensk, Acad. nya Handl. 
1775—1795. 
Doumere. Sur |. Psalidomyia fucicola, in Ann. Soc. Ent. France, 1833. 
Robert. 3n. sp. Diastata, and 1 n. sp. Opomyza, in Ann. Soc. Ent. France, 1834. 
Walker. Obs. on Brit. sp. of Sepside, in Ent. Mag. No. 3. April 1833. — Ditto, 
on the Brit. Tephritites, in ditto, No. 11.— Ditto, Obs. on Brit. sp. of Pipun- 
culide, in ditto, No. 8. July, 1834. 
Keller. Gesch. d. gemeinen Stubenfliege. 4to. Nuremberg, 1764 and 1796. 
Sparrmann, om Flieg-maskar (1, of Musca meteorieca), in Vet. Acad. Handl. 1778. 
Coquebert, in Bull. Soe. Philomat. an. 7 (Musca 8-punctata). 
Home, on the Foot of Musca domestica, Phil. Trans. 1816. 
Blackwall, on ditto, in Linn, Trans. vol. xvi., and in Append. to ditto. 
Macquart, in Mém. Soc. Royale de Lille, 1833; Diptéres du Nord de France, 
(Muscides. ) — Ditto, in ditto (g. Tamiclea). 
Linneus. Dissert. bigas Ins. sistens (Diopsis). 4to. Upsal, 1775. 
Latreille. Mém. sur le Diopsis, in Journ. Soe. Médecine et d’ Hist. Nat. de Bor- 
deaux, tom. i. p. 77.; and Mag. Encycel. tom. vi. 1797. 
Dalman. Notes sur le g. Diopsis, in Vetensk. Acad. Handl. 1817; and in his 
Analecta Entomol. 
Westwood, in Trans. Linn. Soe. vol. xvii. Monog. Diopsis. — Ditto, in ditto, Sup- 
plement to ditto. 
Guérin. Achias oculatus, in Mag. Zool. 1831, Ins. No. 7. 
Wiedemann. Achias g. illustr. spec. novis. Kilia, 8vo. 1830. 
Haliday, on the British Spheroceride, in Ent. Mag. — Ditto on Hydromyzide, in 
Ann. Nat. Hist., June and August, 1839. 
Laporte, in Ann. Sci. Nat. tom. xxv. 1832 (n. g. Macrotoma). 
Zetterstedt, in Ann. Soc. Ent. de France, tom. iv. 1835 (Scandinay. Scatophaga). 
And the general works of Fabricius, Meigen, Macquart, Wiedemann, Haliday, Perty. 

* In Diopsis, however, I have discovered a pair of maxillary lancets, and Mr, 
Curtis also detected them in Lucina, Sapromyza, Borborus, and Drosophila, 
+ In Phora the palpi are not concealed, 
