238 A. e. OUDEMAXS, NOTES ON ACARI. 



schaflFt. das Thier seine Nahrung an den Mund ; mit den Hin- 

 terfüssen putzt es sich, wie die Stubenfliege.« 



»In der äussern Form findet sich viele Aehulichkeit zwischen 

 dieser und der auf Fledermäusen lebenden Milbe {Acarus ves- 

 pertUio/iis Herm., nach Nitzsch zu Gamasus gehörig) ; letztere 

 aber ist weit stärker und lebt von Blut, wie die Lvodes, wel- 

 ches man deutlicli in ihrem Körper durchscheinen sieht.« 



With »Rüssel zweiklappig« Hering most probably means 

 the two chelae of the mandibles. With a dorsal view the legs 

 indeed seem »vom Rande des Bauchs entspringende, von ein- 

 ander getrennte, vielgliedrige, mit Heftscheiben.« Hering, how- 

 ever, is wrong in saying the legs »durch merkliche Zwischen- 

 räume von einander getrennt« as this is au unknown fact in 

 Acari at all. The legs 1 are in Gamasids close to the capitulum, 

 and remote from legs II, but legs II, III and IV, always are 

 close together. Apparently he did not observe the coxae. 



Again, no Acarus is known with »zehngliedrio-e" legs. In 

 Gamasids, the number of the joints is six (coxa, trochanter, 

 femur, genu, tibia, tarsus), even if we join to this number 

 the unarticulate basifemur and basitarsus, we amount to eight 

 joints. The paratarsus is noted by Hering as »kurze Stiele« 

 which bears the sticking pieces : »Heftscheibe.« 



Of course Hering's »Geschlechtsötfnung" is the anus. 



The length is measured 0,19 tot 0,22 Linie, or in modern 

 language from 377 — 437 '■■. 



If we consider now his drawings (Tab. XLV, fig. 18 and 

 19) we see before us a soft-skinned Gamasid somewhat like a 

 Seittlus or a Dermani/ssu.'', about one and a half time longer 

 than wide, with an indistinct marking of a shield, which is 

 much narrower than the creature's width, so that an unpro- 

 tected wide margin all around is discernable. The shield is 

 somewhat roiuid-pointed anteriorly, perfectly round posteriorly. 

 The dorsum is provided with small, thin, scattered hairs. The 

 rostrum long, apparently with triangular epistoma, the palps 



