Bd. V: II) THE ACARI. 7 



The Diaxillary lobes 2-jointed, for the most part covered by the hypostoma, 

 with narrow, cyhndrical proximal joint, the distal joint gradually widening towards 

 the middle and from thence narrowing to the conical, pointed end. Central projec- 

 tions rather short, with semicircular fan-shaped fringe. 



The mandibles (Pi. II, fig. 17) are very slender, with narrow chela, thus bearing 

 a great resemblance to those of the genus Iphis. The lower jaw is shorter than the 

 upper one, with one small terminal and two other small teeth; the upper jaw with 

 large conical terminal tooth and in front of this projecting in a thin, oval and 

 rounded blade. 



The palpi with five free joints, gradually narrowing towards the end; the four 

 first joints of about equal length, richly provided with hairs; terminal joint shorter 

 than the others, with a bundle of about 10 sharply pointed hairs. 



Locality: No. 11. One nympha. 



3. Gamasellus Racovitzai (Trt) Tragârdh. 



T903. Gamasus Racovitzai. Trouess.\rt. Résultats da Voyage du S. Y. Belgica en 

 1897 — 1899. Zoologie. Acariens, p. 8 — 9. PI. I, figs. 3, 3a — 3d. 

 (PI. II, figs. I, 2, 10. 19, 20 & 23; texl-figs. II — 14.) 



This species was described b}' Trouessart (loc. cit.) from Gerlache Strait, but 

 his description is insufficient and partly incorrect. T. has not dissected the man- 

 dibles of the male and has thus not seen that the long appendages he describes 

 belong to the mandibles and not to the maxillary lobes or »corniculae», a mistake 

 which has induced him to refer the species to the genus ParasiUis {Gamasus). 



The following additions and corrections are to be made to T:s description. 



The avibulacres I are in both sexes provided with smaller claws than those of 

 the other pairs of legs and the caruncle is divided in three somewhat larger lobes. 

 Ambulacres II — IV with larger claws and the caruncle divided only in two lobes. 

 Tarsi II — IV ending in two small sharp projections. 



Peritremata (PI. II, fig. 19) short, the stigmata being situated near the anterior 

 margin of coxa; IV, the peritremata not e.xtending forward beyond the posterior 

 margin of coxct II. 



The shoulders are well marked. The posterior hairs of the dorsal side are 

 slightly longer than the others. 



Tlie male. 



Jugular shield very narrow, double. 



Sternal shield with the usual three pairs of hairs. Ventri-anal shield occupies 

 only the median part of the belly, being as broad as the distance between the 

 exterior edges of the coxse IV. 



