A. C. OUDEMANS. ACARI. 141 



none of the hairs are longer than the body. The tarsi are narrow and slightly longer than 

 genu and tibia together. KOCH does not delineate the 4 pairs of short dorsal hairs which 

 apparently hâve been overlooked by him. The colour of the créature is vitreous vvhite, the 

 fore-part of the céphalothorax, the mandibles and the legs brownish red, which in reality often 

 occurs in Tyroglyphus longior Gervais. KoCH found the species in Germany (Regensburg) in 

 moist humus in house, often in flower-pots, especially in warmed rooms. 



1S42. KOCH only quotes the name. 



1S44. GERVAIS does not describe his mite, says only that he found it on cheese of 

 Gruyère and of Holland. He quotes only ^Seconde espèce de Mite de Lyonet." Now Lyonet's 

 „ second mite" is Histiogaster entomophagus. Gervais' drawing is far from being correct. The 

 gênerai outline is good, but the length and position of the hairs is very incorrect. Like 

 Hermann he places the submedian pair of cephalothoracal hairs before the sublateral ones, 

 which is incorrect ; he does not delineate the 4 pairs of short dorsal hairs, a mistake also 

 made by HERMANN and KOCH ; he draws the tarsi I and II too short and tarsi III and IV 

 divided in two parts, like Hermann, 1804, and like TuRPlN in his figure of Acarus liorridiisl 

 The céphalothorax is too short, and therefore also too wide. In fact Hermann's and KOCH'S 

 figures are for the better. 



1849. DUGÈS and MlLNE EDWARDS only quote the name and reproduce GERVAIS' figure. 



1859. GRUBE has found Kocil's dimidiatus in Dorpat on flower-pots. 



1862. LaboulbÈNE and Robin give a more detailed description. For the first time 

 mention is made of the sexes. The male's tarsus IV is provided with two minute suckers on 

 its dorsal side; but they do not say exactly where thèse suckers are placed, near the base 

 of the tarsus or more to the distal end. The male's anus is flanked by two larger suckers. 

 For the first time mention is made of the hairs being „ finement dentelés" with which the 

 authors may hâve meant that the hairs are haired. They found it on moist meal and on 

 cheese. Of the number and situation of the hairs they say nothing. 



1863. ANDERSEN found the Acarus dimidiatus of KOCH in Lund on flower pots. 



1864. KlRCHNER found the Acarus dimidiatus of KOCH in Bohemia in the humus of 

 flower-pots. One could observe that KlRCHNER is not to be trusted for the Rédaction of the 

 „ Lotos" remarks on p. ji: „Der Herr Verfasser hat bei Verfassung des vorliegenden Ver- 

 zeichnisses nicht nur seine eigenen Beobachtungen, sondern namentlich auch die betreffenden 

 Angaben von Hermann, DuGÉ, Koch, Amereing, Kolenaty, Pagenstecher, Jul. Muller 

 und XlCOLET benùtzt." Meanwhile the Rédaction seems to make amende honorable on p. 153: 

 „Wir hoffen, dass vorstehendes erstes Verzeichniss der bôhmischen Milben in Folge von 

 wiederholten fleissigen Nachforschungen durch den geschàtzten Herrn Verfasser sebst, sowie 

 durch andere heimische Naturforscher noch gar manche wesentlich vervollstàndigende Nach- 

 trâge erfahren werde, welche in dièse Blàtter aufzunehmen wir gerne bereit sind." 



1867. Fu.MOUZE gives an ample description and a beautiful figure, made by LACKERBAUER. 

 He mentions the long tarsi which are drawn also as long as the three foregoing joints together ! 

 He says that the colour of the rostrum and the legs is „très peu colorés." In fact it seems 

 that the varieties with such long tarsi hâve less coloured legs than those with shorter tarsi. 

 He tells us that the hairs are longer than the body, and hère he agrées with Hermann. 

 It seems therefore that there are really varieties with such long hairs. He has also observed 



