Ol'HEMAXS. ACARI. 



133 



shoulders above legs III and rounded abdomen. Shape of a still larger larva (Fig. 69) typical 

 thrombidium-shaped. Shape of satiated larva (Fig. 70) anteriorly and posteriorly rounded, with 

 almost parallel latéral sides. Texture of shield, epistome, palps and legs smooth, finely porate; 

 of remaining skin of the body finely wrinkled. Thèse wrinkles do not run parallel with the 

 transverse rows of dorsal hairs ; on the contrary they are very convex backward, whilst the 

 rows of hairs are very convex forward. 



Dorsal side (Fig. 70). The shield (Fig. 72) is trapézoïdal, slightly wider posteriorly; 

 anterior edge slightly concave, being, however, again slightly convex in the middle; latéral 

 edges slightly concave; posterior edge convex, being, however, slightly concave in the middle ; 

 ail the angles well rounded. Eyes. Aside of the posterior angles of the shield a double-eye 

 (Fig. 72) of which the anterior one has a semiglobular cornea and is very light-refracting, 

 whilst the posterior one is provided with a lower cornea and is more dull. Pseudostigmata 

 (Fig. 72) small, round, cup-shaped, in the middle of the shield, on equal distances from the 

 médian line and from the latéral edge of the shield. Psejidostigmatic organs (Fig. 72) long, 

 very thin; their distal half pectinate. Hairs. On the anterior margin of the shield (Fig. 72) a stiff 

 straight médian hair. In the four corners of the shield a slightly curved stiff hair. On the 

 shoulders (Fig. 70) a longer ditto. On the abdomen three transverse rows of 6 hairs each and 

 quite posteriorly again a transverse row of 4 hairs. Thèse rows are only slightly convex 

 forward in the newly hatched larva (Fig. 6j) ; they become still more convex forward when 

 the larva has sucked a little blood (Fig. 68). In a larva which has sucked more blood, and 

 which therefore has become thrombidium-shaped (Fig. 69) the rows hâve become A-shaped; 

 the two latéral hairs of each row hâve been considerably remoted from the four médian ones 

 and hâve been removed considerably out of the transverse line backward. Finally in the most 

 satiated larvae (Fig. 70) the position of the hairs is so changed, that hardly transverse rows 

 of 6 hairs each will be observed; on the contrary they are now placed as follows. Behind the shield 

 four hairs ; in the centre of the abdomen a row of four hairs; still farther backward only 

 two hairs ; on the latéral margins three hairs (the shoulder-hairs included) ; on the posterior 

 margin 6 hairs and quite on the posterior edge two hairs. Ail the hairs are more or less 

 haired, especially on the concavity, for they are a little curve. 



Ventral side (Fig. 71). Coxal sliields I triangular, though with excavate external pos- 

 terior corner, to receive the circular „ Urtachee". Coxal shields II longer, with parallel anterior 

 and posterior sides and rounded proximal end. Coxal shield III longer than wide, with 

 rounded proximal end and nearly parallel anterior and posterior sides. Hairs. Coxal hairs 

 thin and pectinate. Coxal hair I in the anterior distal corner. Coxal hair II medial and distal. 

 Coxal hair III in the anterior proximal corner. Between coxae II a pair of thin feathered 

 hairs. Between coxae III a pair of ditto. A little before the centre of the ventral side four 

 hairs, standing in a transverse line concave forward; the médian pair scarcely, the outer pair 

 well feathered. On a line with the centre of the ventral side a pair of submarginal hairs of 

 the same kind as the dorsal hairs. A little more backward a submedian pair of ditto. A 

 pair of ditto flanks the anus. A little more backward a marginal pair of ditto. Finally a pair 

 on the posterior margin. 



Epistome (Fig. 73) hard, smooth, finely porate, with deep médian furrow, triangular in 

 shape ; anterior top of triangle not porate. 



