52 A. e. OUDEiMANS, NOTES ON ACARI. 



charactei'istic of a subfamily, as we meet with this dispro- 

 portion in many Acavidap, even in the Tyroglyphinae (where 

 it is a rarity). I should like to place it in the Dermoglypldnae, 

 because it has vertical hairs and has not the characteristic 

 thornlike triangular ventral widening« of the tibiae I and II, 

 nor the ball-shaped dorsal backward directed ellbow of the 

 free genu or of the femorogenu. — All the other genera, 

 have spinous fore-legs. The joints of legs I and II, especially 

 the tibiae, are widened ventrally triangulary and sharply. 

 This widening of a joint is not to be compared with a thorn- 

 like hair! Moreover the genu (or femorogenu) I and II are 

 provided dorsally with an ellbow shaped backward directed 

 outgrow. 



The Proctophyllodinae miss the vertical hairs and are moreover 

 well characterized by their female having a deeply cleft abdomen. 



Follow the Epidermocoptinae. At all events I wish to sepa- 

 rate that curious creature Heteropsorus from them and give 

 it a separate subfamily Heteropsorinae- — The remaining Epider- 

 mocoptinae form a natural group. — It is a convenient place here 

 to tell my opinion that the genus Pachi/lichus is nothing but 

 Dermatopjhagoides Bogdanow, 1864, not mentioned in Das 

 Tierreich, and even the species Pachjlichus crassus Can. 

 the same as Dermatophagoides scheremeteicski/i Bogd. 



Finally the Tyroglyphinae. All the Tyroglyphinae are provided 

 with a pair of vertical hairs, except the genera Chortoglyphns, 

 Mealia, Aearidina (not mentioned in Das Tierreich) and 

 Pallea, as far as the drawings of different authors learn us (1 

 did not have them under examination). C/iortogl;/phus is nearest 

 allied to Fxis a car us, and Acaridina tu Giycyphagus; both last-named 

 genera are provided with a pair of vertical hairs. Mealia and Pidlea 

 have typical tyroglyphidiaii claws and caruncles, and though I 

 cannot say to which of the other genera these two are nearest 

 related, I am, however, convinced of it that carefuU examination 

 will prove ray suggestion to be right that also those four genera 



