(dr. a. 0. OUDRAfANS). NOTES ON ACARI VI. 19 



two hairs are implanted in the middle, and two pairs of hairs are 

 placed more marginal, hut before the level of the middle-hairs. 



Ventral side (Fig. 39). This is partly protected by two shields; 

 both are punctulate. The anterior consist of the fusion of the so 

 called epimera of the four fore-legs, between which the narrow real 

 epimera are visible. The posterior shield lies between the coxae 3 

 and 4. The demarcation between these two shields is distinct. On 

 its level there are two marginal haii's. There are two suckers before 

 the sucker-plate. This bears 8 suckers , two of which are large and 

 provided with two central little circles each ; the six others are 

 small. One pair of these stand before and inward , one pair before 

 and outward, and one pair before and backward of the large suckers. — 

 The tactil organ behind the head, or the mentum , is lozency and 

 provided with 6 hairs , of which the two foremost extend beyond 

 the anterior margin of the céphalothorax. Two small rostral hairs 

 do not reach it. 



Legs. The 8 legs are equal in size and shape. The fore 

 legs (Tig. 38) bear a tactil hair on their tibia and four leaf-like 

 hairs on their tarsus. The tactil hair of leg 1 is longer than that 

 of leg 2, equaling the leg in length. The distal and outward leaf- 

 like hair of legs 1 and 2 ends in an almost circular piece; all the 

 other leaf-like hairs , also those of legs 3 and 4 end in a lanceolate 

 blade. Genu and tibia bear a little hair or spine on each side. 

 On the ventral side (Fig, 39) the coxa and femur 1 and 2 have 

 a long tactil hair. The ^arsi 3 and 4 bear a long tactil hair; that 

 of the tarsus is scarcely longer than leg 3; that of tarsus 4 equals 

 the animal's breadth. 



JTahifat: On Bombus terrestris. Probably the adult lives in the 

 nests of Bomhis. 



Patria: Netherlands. 



21. Key to the species of Tyroglyphus. 



Hypoiii. 

 With two aliform appendages 

 -1. ' at corners of céphalothorax . T. krameri Beri. 

 Without s\ich 2 



