242 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. 3 and 4. 



Partly grown larvae are shewn in fig. 6, a and h. Like so 

 many dipterous larvae 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 larvae 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. 



Explanation of Plate, 

 Fig. 1. The fungus, Einchlo'e tyxtliina, in situ, on cuhns of grass. Fig. 2, a. 

 Unhatched egg of Anthomyia sjrrcta; b. Egg-shell of A. spreta (x 6). 

 Fig. 3. Egg-shell, tunnel, and tracks of larva of A. spreta (x 4^). Fig. 4. 

 Egg-shell at a later stage ( x 4A). Fig. 5. Egg-shell and tunnel of a large larva 

 (x A\). Fig. 6, h. Larva of A. sp)reta ; a. larger larva of A. spireta, photo- 

 graphed from microscope slides prepared by Dr. T. A. Chapman (x 6). 

 Fig. 7. Puparium of A. spreta, drawn from living or recently dead specimens 

 (x 9). Fig. 8. Imago of ^. sjpreta, drawn from dead specimens (x 4^). 



NOTES ON DEAGONFLY PARASITES (LARVAL 



WATER-MITES). 



By F. W. & H. Campion. 



The 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 {Tenthredo 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 Ccenia ohscura, Mg., with a larval Hydraclmid 

 wedged between the thorax and abdomen. Among Coleoptera, 

 the same author mentions several species of Dytucus 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. 359-370, and plates 

 26-30. 



