lO IVAR TRAGÂRDH, (Schwed. Südpolar-Exp. 



Gamasiphis Berl. 



1904. Gamasiphis iiov. t^eii. Berlese. Acari nuovi. Manipulus 2, in Redia, vol. I. fasc. 2, 



1903, p. 261. 



Syn. 1907. Hcxdeniella iiov. gen. F. Richters. 



The genus Heydeiiiella lately instituted by RICHTERS [9] is undoubtly the 

 same as Gamasiphis Berl. Riçhter.S tells us that the genus is characterized 

 by the ventri-anal shield being coalesced with the dorsal shield. In the male the 

 shields are stated to have quite coalesced; in the female a short split is said to exist, 

 extending backwards from the limit between the genital, ventri-anal and dorsal shields. 

 Now this feature happens to be exactly the characteristic of the genus Gainasip/iis! 

 To be convinced of this fact we need only glance at the drawings of G. piilcliellus 

 Berl. the type species of the genus Gainasipliis made by Berlese [i. fasc. 39, 

 No. 4]. It is true that also in Parasitus sitbgen. Ologaniasiis these shields are more 

 or less coalesced, but as RICHTERS' species is stated to have a free calcar mandi- 

 buli, it belongs to Gainasipliis: otherwise it would belong to Parasitus subgcn. 

 Ologaniasiis. 



4. Gamasiphis loricatus nov. spec. 



(PL I, ftgs 4. 5 .V 7. text-figs 15 — 17-) 



Male. Length o,q+ mm. Breadth 0,55 mm. 



Shape oval, with distinct shoulders; the anterior margin rounded, the posterior a 

 little pointed. 



Colour, deep chestnut brown. 



Texture scaly by fine, raised and undulating lines, running transversally and 

 connected by other, oblique lines, thus forming irregular hexagonal-oval areas. 



Dorsal side covered by a single, somewhat arched shield, witli about 25 pairs 

 of regularly placed, fine, straight, pointed hairs, gradually becoming longer towards 

 the posterior margin; about 12 pairs of marginal hairs. 



Ventral side (PI. I, fig. 5 ). Tritosternum with an incision near the base. One pair 

 o{ jugular shields, with narrow median halves, anterior margin concave, gradually rising 

 towards the lateral third; the exterior angles with an incision, no hairs (text-fig. 17). 



Sternal shield of even width throughout, extends backwards to the level of the 

 hind margin of coxcX' IV; anterior margin straight, with a great circular incision to 

 receive the genital aperture; the posterior margin slightly convex; antero-lateral 

 angles long, extending as far as the exterior margin of cox;t II; postero-lateral angles 

 short and pointed. 



