104 (dr. a. c. oudemans). notes on acaei. 



r. I Livinof 0« their hosts 3 



Mining the tissues of the hosts. . 5 



On Insects; genital suckers of c? and $ 

 well developped II Canestriinae. 



3. ) On Mammals and Birds , genital 



Ì suckers absent , or rudimentary 

 in (? 4 



. ( On the hairs of Mammals ... Ill Listrophorinae. 



' On the feathers of Birds .... IV Analgeshiae. 



i Vulva transversal; mandibles chelate. V Acarinae. 



Vulva longitudinal; mandibles and 



maxillae transformed in sucking tube VI Cyiodytinae. 



Classification of Demodicidae. One genus. 



Classification of Eriophyidae, proposed by Nalepa is correct, based 

 on the probable relative ancienty of the subfamilies. The Eriophyidae 

 have got their ringed, cylindrical body and the absence of hind-legs 

 by their manner of living in galls. It is difficult to comprehend 

 why free-living Acari should have such a shape; therefore we must 

 admit that the at present free living F hyllocoptinae are descended 

 from the gall -inhabiting Eriophyinae; therefore their body has again 

 become more broad and flat. 



I Number of dorsal and ventral half- 

 \ rings about equal; they live oftenest 



j in galls I Eriophyinae. 



Number of dorsal half- rings much 



smaller than that of ventral half- rings 



thy oftenest live free II Phyllocoptinae. 



2. Acari of France. 



Dr. F. Heim, of Paris, has sent me 1902, Mrch. 1, the following 

 Acari for determination. 



Dermaceutor reticulatus (Fabr.) on Homo sapiens L., in the Monts 

 d'Estinel (Var). 4 c?, 4 ?. 



Glycyphagus destructor (Schrank"). They were abundant in a house 

 at Angers (Maine et Loire). 



