Infe History of Lonchaea chorea. 319 
Farsky’s experiments the development occupied a rather 
longer time than I experienced in mine. This may be in 
part, I think, associated with the fact that the food on which 
he reared his larvae, consisted of pieces of decayed beetroot, 
whilst in my experiments, the larvae may have found a 
richer diet in the nutritious cow-dung. On this account 
their development may have been greatly hastened, all 
the more so when we take into consideration the high 
temperature prevailing in the laboratory where my breeding- 
cages were kept. The complete metamorphosis was gone 
through in not more than four to five weeks; whereas, 
Farsky states that the. time required is ten to fourteen weeks. 
But I must add that this agrees very well with the time 
occupied in the development of the imagines which I 
reared in the cool house at the lower temperature of 50° F. 
In this case, at least ten weeks passed between the act 
of oviposition and the appearance of the adult. 
Buccan APPARATUS OF LARVA. 
The elaborate mouth-parts (fig. 7) consist of a number 
of pairs of sclerites which become more strongly chitinised 
and tend to fuse, as the larva matures. Projecting through 
the oral aperture and surrounded by the rugose areas of 
the mouth, is a pair of parallel, robust, sickle-shaped hooks 
(md. s.) to which there articulates distally the hypostomal 
sclerite (h. s.) bearing two small teeth on its ventral aspect. 
Ventro-posteriorly a pair of small irregular dentate sclerites 
(d. s.) articulates with the falciform hooks. The hypo- 
stomal sclerite has two arms connected by a slender cross- 
bar, each arm fitting into a space between two anterior 
ventral processes of the corresponding cephalo-pharyngeal 
sclerite (c. p.). These paired cephalo-pharyngeal sclerites 
have attached to their anterior dorsal extremities, a small 
perforate sclerite (pf. s.) which serves to unite them; 
whilst posteriorly, a deep bifurcation divides each sclerite 
into a slender dorsal (d. p.), and a broad ventral process 
(v. p.). The whole of the mouth-apparatus is left behind, 
attached to the dorsal anterior valve of the puparium, 
when the imago emerges. 
Tue Imaco. 
From the very full descriptions of Farsky and Schiner * 
* Schiner, Fauna Austriaca. Die Fliegen, vol. ii, -p. 91. 
