6x4 



IVAR TRAGArDH 



i6i 162 



Figs. 161 — 1 62. Scirus longipalpis n. sp. 

 161. Mandible. 162. Chela raandibuli. 



The ventral side (fig. 160) and the 

 legs are of the typical shape, only the coxa; 

 I — II are not contiguous as in Svlongirostris 

 according to v. Vitzthum (1926, fig. 78, 

 p. 130) and, remarkably enough, the number 

 of hairs on the coxse is quite different, a 

 feature which may possibly be useful for 

 taxonomic purposes also in other species. 

 Thus coxae I have 5 hairs, coxae II 5 hairs, 

 coxae III 7 hairs and coxae IV 3 hairs. 



Loc: Juan Fernandez, Masatierra. 



27. Anystis baccaruni (L.). 

 A cosmopolitan species. 

 Loc: Juan Fernandez, i specimen. 



28. Belaustium obtusum n. sp. — Figs. 163 — 166. 



If we use the key of the Erythraeidse given by v. Vitzthum (1919), 

 which is based on the investigations of OUDEMANS, it is impossible to find a 

 place for the present species. This is not surprising, as this key is based only 

 on the European species, but it emphazises the urgent need of a thorough in- 

 vestigation and revision of all the extra European species, for the purpose of 

 taking a complete survey of all the acarina. 



We have to chose between the two genera Leptus Latreille and Be- 

 laustium V. Heyden. The former is characterized in the following way (1. c. 

 p. 69): »Crista bildet einen medianen Langsstreifen in einem (schwer wahr- 

 nehmbaren) Riickenschild. Vordere Area sensilligera ragt als 'Nase' iiber das 

 vordere Rumpfende hinaus. Augen hinter der Mitte der Crista. Rumpfhaare 

 fein, glatt oder wenig behaart » The latter in the following way: »Kein Riic- 

 kenschild um die Crista. Vordere Area sensilligera nicht hervorragend. Augen 

 vor der Mitte der Crista. Rumpfhaare dick, stabformig, dicht mit Haaren oder 

 Stacheln besetzt. Palptarsus konisch, zylindrisch, meist halbkugelfbrmig der 

 Palptibia ventral aufgesetzt». 



The present species agrees in all respects with Leptus with one exception, 

 which seems important enough. The anterior area sensilligera does not project 

 at all like a nose, but the anterior edge is cut off almost squarely, at any rate 

 there is no projection, as in Leptus. 



Furthermore there seems to be two pairs of eyes (fig. 164) although only 

 the anterior pair seems to have a distinct lens. This feature it seems, how- 

 ever, to share with Belaustium where according to OUDEMANS and V. VITZ- 

 THUM (1. c. fig. 95) there is a similar, rounded naked spot close behind the 

 eyes, a little closer to the centre. 



