A. C. OUDEMANS. ACARI. 131 



Legs (Fig. 51 and 57). Left legs respectively 7636, 6000, 6555 and 7818 y. long; right 

 legs respectively 7555, 5272, 5312 and 6636 ft long; in average each joint is provided with 

 three dorsal, five anterior and five posterior hairs or bristles. Each tarsus ends claw-like. 

 Tarsi III and IV moreover are provided with a second accessory claw. Paratarsi (Fig. 58) 

 distincty two-jointed, (proparatarsus and metaparatarsus). Empodium and claws normal. 



Habitat: unknown. * 



Thrombidium van der Sandei Oudms. 

 (Plate IV, fig. 59—66). 



1905 March 1. Thrombidium van der Sandei nov. sp. OUDEMANS in Entomologische Be- 

 richten, n°. 22 p. 216. 



Patria: New Guinea (40 ex.). 



Fourni by Mr. G. A. J. van der Sande, physician to the Expédition. 



Larva (Fig. 59 — 66). Length 200 — 300,0., measured on 40 spécimens. Coloitr scarlet; 

 in spirits colourless. Shape of newly hatched larvae short, scarcely longer than wide, with 

 small shoulders between legs I and II, and big rounded ones above legs III ; abdomen poster- 

 iorly rounded. Texture of epistome, dorsal shield, palps and legs smooth, finely porate, of 

 remainder skin of body finely wrinkled. Thèse wrinkles run almost parallel to the transverse 

 rows of dorsal hairs. 



Dorsal side (Fig. 59). Dorsal shield subhexangular, with one anterior, one posterior and 

 four latéral sides, wider than long; anterior side the longest and straight; the 5 remainder 

 sides almost equal in length; posterior side slightly concave. Eyes: aside of the shield a double- 

 eye, of which the anterior one is distinctly semiglobular, prominent, the posterior one indistinct, 

 much less prominent and less light-refracting. Pseudostigmata almost in the centre of the 

 shield, round, cup-shaped- (Fig. 62). Pseudostigmatic organs clavate; peduncle and head almost 

 equal in length; peduncle rodlike, thin, smooth; head swollen, distally rounded, proximally 

 rapidly tapering towards the peduncle, seen from aside almost equal in width and length; 

 seen on the top (Fig. 63) elliptical; yellowish brown with greenish hue; contents oily, very 

 light-refracting; surface of head examined with oil-immersion-system finely villous. Hairs. On 

 the anterior margin of the shield one médian hair. In each anterior and in each latéral corner 

 of the shield a hair. On each shoulder above legs III a hair. On the abdomen 5 transverse 

 rows of ten hairs each. Ail the hairs are slightly curved, except the above mentioned médian 

 hair which is straight. The médian hair is scarcely hairy; the 4 other shield-hairs are better 

 haired; ail the other dorsal hairs are more or less serrate (Fig. 61). 



Ventral side (Fig. 60). Behind the rostrum there is a collar-shaped shield, widest in 

 the centre. Coxae I triangular, with posterior external angle excavate to receive the „ Urtrachee" 

 which is round. Coxae II longer, internally rounded. Coxae III almost quadrangular ; intern- 

 ally rounded. Anus ventral, nearer the posterior abdominal edge than the coxae III. Hairs: 

 coxal hairs thin, a little curve, beautifully pectinate with from three to five smaller hairs on the 

 convexe side. Between the proximal ends or angles of coxae I a pair of ditto. Between the 

 coxae III a pair of ditto. Behind this pair a single pair of stiff, slightly curve and externally 



