[ 382 ] 

 By Charles D. Soar. Part IX. Plate XXL 



Genus XII. — Midea (Bruzelius). 

 1854. — Bruzelius, Beskr. o. Hydrach7i. som. forekommer i. Skane, 



P- 35- 



THE following is a general description of this hydrachnid : — 

 Body, hard-skinned, with a finely granulated surface ; on 

 the dorsal surface is a depressed line placed very close to 

 the margin. The exterior of the inner portion of the dorsal 

 surface is marked very conspicuously with twelve dermal glands 

 arranged in four sets of three. The legs are well supplied with 

 swimming hairs. On each side of the genital fissure are numerous 

 genital suckers. The Epimera form one group. 



Midea orbiculata (Miiller). 

 1776. — Hydrachna orbiculata. O. F. Miiller, Zool. Dan. Frodr., 



p. 190, N. 2266. 

 1 78 1. — Hydrachiia orbiculata. Miiller, Hydrachnce^ etc., p. 55, 



Tab. VII., Figs. 3 and 4. 

 1793. — T^'ombidium orbiculatu7?i. J. C Fabricius, Ento7n. Syst , 



ii., p. 405, N. 30. 

 1805. — Atax orbiculatus. J. C. Fabricius, Syst. Antliatorum, 



P- 371- 



1854. — Midea orbiculata. Bruzelius, Beskr. 0. Hydrachn. som. 



forek. i. skane ^ p. 36, Tab. iii., Fig. 5. 

 1880. — Midea orbiculata. C. J. Neuman, Sveriges Hydrachnider^ 



p. 55, Tab. xi.. Fig. i. 

 1894. — Midea orbiculata. Piersig, Zool. Anz., No. 449, p. 215. 



On referring to Miiller, PI. VII., Figs, i — 4, will be found two 

 mites figured, which Miiller has named Hydrachna elliptica and 

 Hydrachna orbiculata, which are no doubt two mites of the same 

 genus {Midea). If we compare the mite now under consideration 

 with Miiller's, Figs. 3 — 4, I do not think we can come to any 

 other conclusion than that these mites are identical. Midea orbi- 

 culata is nearly round ; the impressed line is near the outer 



