219, THE ENTOMOLOGIST. 
also (fig. 3), where the tunnel is inhabited by a larva of smaller 
size. In fig. 5-is depicted the tunnel of a large (if not full- 
grown) larva, the scale of magnification being the same as that 
of figs. 8 and 4. 
Partly grown larve are shewn in fig. 6, a and b. Like so 
many dipterous larve they are simple maggots, means of 
extended locomotion and so forth being unnecessary, since they 
are surrounded by a good supply of suitable food. When full- 
fed the larve fall to the ground, and form around themselves a 
reddish-brown puparium between 3 and 4 mm. long (fig. 7), 
which is again very characteristic of certain groups of the 
Diptera. From this puparium emerges in the following spring 
(though there is probably a partial autumn brood sometimes) a 
little blackish fly (fig. 8), in general appearance not unlike a 
small house-fly, though smaller, for it is but some 9 mm. in 
expanse of wing. 
EXXPLANATION OF PLATE. 
Fig. 1. The fungus, Epichloé typhina, in situ, on culms of grass. Fig. 2, a. 
Unhatched egg of Anthomyia spreta; b. Egg-shell of A. spreta (x 6). 
Fig. 3. Egg-shell, tunnel, and tracks of larva of A. spreta (x 43). Fig. 4. 
Egg-shell at a later stage (x43). Fig. 5. Egg-shell and tunnel of a large larva 
(x 43). Fig. 6, 6. Larva of A. spreta; a. larger larva of A. spreta, photo- 
graphed from microscope slides prepared by Dr. T. A. Chapman (x 6). 
Fig. 7. Pupariuin of A. spreta, drawn from living or recently dead specimens 
(x 9). Fig. 8. Imago of A. spreta, drawn from dead specimens (x 43). 
NOTES ON DRAGONFLY PARASITES (LARVAL 
WATER-MITES). 
By F. W. & H. Campion. 
Tue presence of parasitic Arachnida has been detected upon 
insects representing each of the seven great orders. As an ex- 
ample of Hymenoptera attacked in this way, we may mention a 
European sawfly (T'enthredo maura) in the National Collection, 
to which Mr. W. F. Kirby has kindly drawn our attention. The 
Acari found parasitic upon ants and bees are so numerous, both 
in species and in number of individuals, that quite a large 
literature exists upon the subject. More than one collector has 
informed us that mite-attacked Lepidoptera are not infrequently 
met with. Among Diptera, Mr. Charles D. Soar * has figured 
a specimen of Cenia obscura, Mg., with a larval Hydrachnid 
wedged between the thorax and abdomen. Among Coleoptera, 
the same author mentions several species of Dytiscus which serve 
as hosts, and figures an example of D. marginalis with numerous 
mites on its ventral surface, and with some even on one of its 
* See his paper ‘‘ Notes and Observations on the Life-history of Fresh- 
water Mites,” in Journal Quekett Micro. Club, 1906, pp. 359-870, and plates 
26-380. 
