DB. JOHNSTON ON THE ACARIDES OF BEEWICKSHIRE. S05 



14. Gamisus laoenarius, Dugh. 



G. oblongus antice rostratus albus inaculis fuscis decussa- 

 tim coalescentibus postice pictus. Long. l-3d lin. — La Ga- 

 mase lagenaire, Dugls in Ann. des Sc. Nat. (1834) ii. 28. — 

 Gamasus lagenarius, Gervais in Walck. Ins. Apt. iii. 219. 



Deso. Bodg ovate-oblong, narrowed and rostrate in front, 

 of a watery-white colour, spotted posteriorly with fuscous- 

 brown, three spots on aline before and behind, the outer spots 

 connected by a crucial band so as to form a marking some- 

 thing like the letter x, the back convex and even, covered 

 with short curved bristles : Falpi pedifonn, longer than the 

 retracted mandibles, bent at the apex, bristly, 5-jointed, the 

 2d joint bulged, the ultimate one minute, cylindrical, obtuse, 

 tipped with numerous short bristles ; on the inner aspect of 

 the joints there are also a few short spines of which ihe one 

 near the insertion of the terminal joint is moveable : Legs 8, 

 nearly equally disttinced in their origins, of a watery white 

 colour, unspotted, bristly, all terminated with a pedunculated 

 lobated vesicle, and two divergent minute claws ; 1st joint 

 short and thick, 2d twice as long, 3d elongate, incrassated 

 upwards, slightly curved, 4th also curved, about half as long 

 as the third, 5th straight, as long as the fourth, 6th filiform 

 and elongate, with a nearly sessile vesicle in the first pair of 

 legs, but of the other legs the tarsal joint is decidedly tapered, 

 and the vesicle is on a rather long pedicle : Bristles setaceous, 

 smooth, originating in a small bulb, all pointing downwards. 



This mite is less than the Gamasus coleoptratorum ; and 

 the structure of the mouth and oral apparatus is so nearly the 

 same as not to require description. The cheloe of the mandibles 

 are dark brown, elongated, straight, curved at the apices, and 

 very minutely denticulated. The skin of the back is conti- 

 nuous and uniform, but the posterior portion is marked with 

 brown in a manner not easily described, and yet ^vhich fur- 

 nishes the most distinctive character of the species. As these 

 spots depend on the contents of the cocca, their distinctness 

 and measure of coalescence may be presumed to vary with 

 the nature and quantity of the food. I found my specimens 

 on the gills of a decaying mushroom, and it is also found 

 in moss. It is as rapid as its congeners in its motions. 



15. EUMJEUS INORNATUS. 



Disc. Mite minute, of a uniform dusky brown colour, very 



