(dr. a. c. oddemans). notes on acari. 



135 



I should like io definite the genus as follows : 



«Legs 1 have between theii- coxae the «rostrum.)) All the legs 

 short and thick, subequal in thickness. Two dorsal shields. ? with 

 genital shield. Type Periglischrus caligus Klti. » 



15. Periglischrus jheringi Oudms. 



(With Plate 11 fig. 20—27). 



Briefly described in Entomologische Berichten, p. 88 ; 1, VII, 1902. 



ProtonympJia. Length 480 ,«. — Colour between pale and sul- 

 phureous. — Shape Sjnntnrnix-Wke ; body flat, oval, top back- 

 ward. — Dorsal side (Fig. 20) protected by two dorsal shields. 

 The anterior dorsal shield subheptagonal , truncated and excavated 

 trapezoidally posteriorly; the foremost half of the lateral margins 

 and the anterior margins with sinuosities between the 4 paiis of 

 hairs which surround it. The posterior dorsal shield nearly trian- 

 gular. There is a narrow space between the two dorsal shields. 

 At the level of this space there is a hair on each side, and out- 

 ward of this hair the stigma (see below.). — Ventral side (Fig. 

 21) with subheptagonal stern.d shield, truncated anteriorly , pointed 

 posteriorly, with 3 pairs of hairs. No anal shield. Behind the 

 sternal shield and between the coxae 4 four pairs of hairs. Stigma 

 perfectly lateral , invisible when the animal is viewed from the 

 dorsal or from the ventral side (Fig. 20 and 21). — Peritrema 

 dorsal, short, running forward and outward exactly to the level 

 between legs 2 and 3. Legs resembling those of the deutonympha 

 (Fig. 22). 



Deutonympha. Length 560 u. — Colour between pale and sul- 

 phureous. — Shape Spinturnix-Vike ; body flat, oval, broader than 

 in the protonympha , top backward. — Dorsal side (Fig. 22) 

 protected by two dorsal shields. The anterior dorsal shield subhep- 

 tagonal , truncated and excavated posterioily, pointed anteriorly; 

 margin without the above mentioned sinuosities of the protonympha. 

 The posterior dorsal shield subpentagonal, with 3 sides contiguous 

 to the anterior shield. The two shields are surrounded by 6 pairs 



