A. C. OUDEMANS. ACARI. 121 



part long-triangular with rounded top and longitudinally finely striated ; its posterior part 

 scaly, smooth, scarcely constricted i'n the middle; its posterior edge scarccly convex in the 

 middle; the pair of génital hairs submarginal where the constriction is. ^«fl/j-/zz>A/rhomboidal 

 or lozenged with rounded angles, long; with the usual three hairs. Cribrum aside the post- 

 anal hair, scarcely discernible. Anus rather large, trapézoïdal, longer than wide, wider poster- 

 iorly, shut by two valves. No metapodial, no inguinal shields. Peritrematic sliields occupying 

 the spaces before the foveolae pédales II, III and IV, narrow outside of the peritremata, 

 narrow in their dorsal part, pointed posteriorly, not reaching beyond the foveolae pédales 

 IV. Stigmata on the usual place, minute. Peritremata long, almost reaching the vertical hairs 

 on the dorsal side. Hairs. Besides the hairs already described (on the shields) the belly is 

 provided with 4 hairs on a row behind the génital shield, 4 pairs surrounding the anal shield, 

 and 5 pairs of marginal hairs. 



Epistoma (Fig. 1, 4, 5) provided with a double transverse line before the vertex, and 

 with a small transverse line behind the palpi. Anterior edge with three mucro's of which 

 the outer ones may be provided with minute distal outer spines. 



Mandibles short, when retracted scarcely extending beyond the two transverse lines in 

 the foremost part of the dorsum ; when extruded extending to the tops of the palps (Fig. 1). 

 Tibiotarsale somewhat swollen basally and externally. Chelae (Fig. 6, 7) short, strong, very 

 remarkable. Firstly the so-called upper jaw or basitarsus is distinctly articulate with the tibia; 

 this latter provided with a kind of chitinous hood above the proximal strongly chitinized 

 portion of the upper-javv. Second/y the upper-jaw is internally provided with a narrow membrane 

 with denticulate free edge. Thirdly the upper jaw overlaps externally the lower jaw, and is 

 hère nearly straight, showing only two small distal incisors; further it is provided with a saw 

 of about 17 triangular teeth behind the already mentioned incisors; finally internally it receives 

 the three teeth of the lower jaw in three wide excavations. Lower jaiv very strong, only 

 provided with three teeth, a large incisor, a smaller canine, a still smaller molar, ail of the 

 same shape. Sensé organs entirely absent, even a pulvillum is wanting. 



Maxillae (Fig. 8, 9). Coxal parts fused together, showing, however, a médian wide 

 band between them, which lengthens forward in the bifid médian free pièce. This médian 

 band shows, as far as I could discern, seven transverse rows of minute triangular teeth 

 (directed forward) ; most of thèse rows are convex forward or convex backward, or undulate. 

 The side-parts bear a few chitinous ridges in the usual places and two other ones directed 

 from hair IV forward and outward ; moreover the four usual coxal hairs. Horns of normal 

 size, scarcely S-shaped, bluntly pointed. Inside and dorsally of the horns a minute transparent 

 pièce, almost round, with sharp distal point. The médian slip, fusion of inner malae, bifid ; 

 its slips externally serrate. 



Lingua short, wide, blunt. Fémur (Fig. 9) ventrally with an internai bristle which, 

 however, ends in a circular fiât pièce. Genu ventrally and internally with the usual two knife- 

 like bristles, both having their sharp edge forward ; the posterior one curve ; the anterior 

 one straight. Tarsus ventrally and internally with a flat trifid appendage of which the fore- 

 most tooth is very wide, oval in shape. 



Legs of the usual shape and length. Ail the tarsi with distinct basitarsus. The hairs 

 are in gênerai bristles. Noticeable are two fine tactile hairs standing nearly perpendicularly 



Nova Guinea. V. Zoologie. 16 



