556 MODERN CLASSIFICATION OF INSECTS. 
The stirps may, therefore, be divided in the following manner :— 
Section 1. Proboscis with four internal pieces. (Fam. Syrphide. ) 
Section 2. Proboscis enclosing two pieces. (Fam. Conopsidz, Muscide. ) 
Section 3. Proboscis rudimental. (Fam. (istride.) 
A connexion between the Syrphidz and Conopside is thus effected 
by means of such genera as Ceria and Conops; and the communi- 
cation between the Conopsidz and Muscide, by means of the genera 
Stomoxys and Bucentes, as indicated by Latreille, is adopted. The 
CEstridz are not further removed from the Pupipara than the genus 
Phora, with which the true Diptera are generally terminated. Indeed 
the imperfect structure of the mouth of the Cistride appears to point 
out the propriety of placing them at the end of the order. In their 
parasitic nature they are also nearer to the Hippoboscide than any of 
the preceding Diptera. 
The family Syrpui1pm*, composed for the most part of portions of 
the Linnean genus Musca, is distinguished from the preceding families 
by the nature of its transformations, noticed above, and from the re- 
mainder of the Athericera in having the mouth more perfectly 
organised (fig. 130. 18. Syrphus Pyrastri) ; the proboscis is long, mem- 
branous, elbowed near the base, terminated by two large labial lobes, 
and enclosing in a channel on the upper surface four sete, viz. a long 
horny upper lip, hollow, and notched at the tip; a pair of slender 
acute maxillz, and a slender acute tongue; at the base of the maxillz 
are also attached a pair: of small inarticulate palpi, thickened at the 
tips (jig. 130. 19. mouth of Syrphus); the head is hemispherical, 
and generally covered for the greatest part by the eyes, especially in 
the males ; the front of the head is often produced into a kind of beak, 
hollow beneath ; it is mostly short and broad, but sometimes elongated, 
cylindrical, or clavate at the tip, receiving on its under side the 
trophi when at rest; the antenne (fig. 130. 20.) are 3-jointed, the 
third joint being the largest, dilated, oval or reniform, &c., without 
any traces of articulation, and emitting a seta articulated at the base 
and sometimes plumose (jig. 131.3. ant. of Volucella); the abdomen 
is never incurved at the extremity; the wings are much more 

* Bisriocr. REFER. TO THE SyYRPHIDA. 
Macquart. Diptéres du Nord de France (Syrphies), 8vo. 1829. 
And the general works on the order. 
