(dr. a. c. oudemans), new list or butch acari, ir. 29 



shield in this speccies extends more backward and is truncated 

 posteriorly. 



The chela is smaller (Fig. 46j than in both the above mentioned 

 species. 



4. 



28, Key to the species of Cyrtolaelaps Beri. 



Î ventral and anal shields separate .2 

 ? ventral and anal shields fused . ,4 

 Two distinct dorsal shields . . .C, nemorensis (C. L. Koch). 



2, I Dorsal shield with deep lateral inci- 

 sions 3 



Incisions directed towards each other. C. transisalae Oudms. 



3. / Incisions bent towards posterior end 

 of abdomen C. cervus (Kram.) 



Ambulacra 1 without membrane .C. mucronatus G. etR. Can. 



Ambulacra 1 with membrane . .5 



Dorsal shield posteriorlywith 2 horns. C. COrnutus (Kram.) 



No such horns G 



Epistoma with 3 spines . . . .C. bisetus (Beri ) 



Epistema with 1 spine 7 



i appendage of mandible much lon- 

 ger than mandible C. spjricornis G. et R. Can. 



$ appendage of mandible scarcely 



longer than mandible . . . .C. falciger G. et R. Can. 



6. 



29, Pseudoparasitus Oudms., nov. gen. 

 (for Laelaps merldionalis G, et R, Can,) 



In his Conspectus familiarum on p, 15 of his work, entitled 

 Ordo Mesostigmata, Berlese divides the families of the Pteroptklae^ 

 Dermanyssidae , Laelaptidae and Gamasidae into two groups. The 

 first , constituted by the first three families , has : pedes secundi 

 paris in uiroque sexu similes; the second group including only the 

 Gamasidae, has: pedes secmidt, paris in marihiis validiores quam 



