" 272 INSECTA, 
Their skin becomes the cocoon of the pupa. They do not change 
their form, but become rigid and incapable of moving or bending 
_ their body; the tail is frequently at an angle with the trunk, and thus 
they float upon the water. The pupa only occupies one of the ex- 
tremities of its cocoon, and the perfect Insect issues from it through 
a fissure which is effected in its second ring, and remains on its ex- 
uviz, where its body becomes firm, and its development is com- 
pleted. 
A common species in France is the 
S. chameleon, Fab.; Rees., Insect. Il, Musc. v. Six lines in 
length; black; extremity of the scutellum yellow, and armed 
with two spines; three lemon-coloured spots on each side of 
the superior part of the abdomen(1). 
OvonromyiA, Meig. 
Where the antenne are hardly longer than the head, with the 
two first joints short, and almost equal in length; the third forms a 
highly elongated, slender cone composed of at least five distinct 
rings, the last, conical, abruptly compressed and curved inwards, 
represents the extremity of the stilet, otherwise similar to the 
others(2). P 
Epurprium, Lat,—Clitellaria, Meig. 
Where also the antenne are hardly longer than the head, and thée® 
two first joints short, but the third forms a shorter and thicker cone, 
with the fourth ring conical, truncated, abruptly attenuated at the 
extremity, and terminated by a stilet of two joints, the last of which 
is much the longest and slightly arcuated. 
E. vulgaris; Stratiomys ephippium, Fab.; Scheeff., Monog., 
1753. Deep black; thorax satin-red with a spine on each side 
and two on the scutellum. On the trunks of old Oaks(3). 
Oxycerra, Meig. 
The Oxycere resemble the Ephippia in the shortness of their 
(1) For the other species, see Latreille, Meigen and Macquart. 
(2) Idem. M. Meigen now unites this genus with the preceding one.. 
(3) See the authors just quoted. 
