108 (dr. a. c. oitdkmans). notes on acari. 



Dorsal side (fig. 5) with one dorsal shield, covering the whole 

 dorsal side, with about six longitudinal irregular rows of hairs, 

 and two quite marginal rows (one on eacli side). 



Ventral side (fig. 6). Peritrematic and sternal shields fused, with 

 demarcations between the coxae though. Peritrematic or lateral 

 shields very wide and with wide metapodial prolongations. Sternal 

 shield wide, wider behind coxae 2, provided with 4 pair of hairs, 

 and a little excavated posteriorly. — Genital and ventral shields 

 fused, almost pentagonal; the posterior edge almost parallel to the 

 anterior edge of the anal shield; the two posterior-lateral ones 

 free and in the same curved line with the free edges of the peri- 

 trematic and metapodial shields ; and the two anterior-lateral edges 

 partly parallel to the inner egdes of the metapodial shields, partly 

 lying over the sternal shield. Anal shield wider tlian long, with the 

 usual 3 hairs and crihrum. To the sides of the ventral and anal 

 shields and behind them about 10 pair of hairs. 



Peritrema (fig. 6) in the middle of the lateral shields, witli curve 

 directed inward between coxae 2 and 3, extending beyond coxae 1. 

 Epistoma (fig. 7) differing from that of all the known Pachy- 

 laelaps in being deeply incised at its top, in this way still more 

 resembling that of Macrocheles. The inner sides of the top deeply 

 denticulate, or pectinate, but irregularly, some of the teeth being 

 split, or better said: some of the teeth basally united. Lateral edges 

 finely denticulate. Dorsal side with some markings, better understand 

 by a figure than by a long description. 



Mandibles (fig. 8). Upper jaw with a blunt molar, a wide 

 canine tooth, diiected slightly backward, and two incisors close 

 together, a smaller one behind the lai'ger top-tooth. A distinct 

 sense-organ. Lower jaw with a wide canine tooth directed shightly 

 backward, behind that of the upper jaw, and a small incisor between 

 this canine tooth and the top-tooth. 



Maxillae (fig. 9). Hypostome simple; the inner malae simple, 

 finely hairy, fused in their proximal half, as long as the outer 

 malae; outer malae or horns simple, wide. Tongue twice longer 

 than the inner malae. 



