250 ENTOMOLOGISK TIDSKRIFT 1917. 



Palpigradi and, what is more curious, in the Ricinulei 

 no fissure could be detected. — Among the hypotheses 

 on the function of the lyriform organs two (proposed respect- 

 ively by Dahl and by Carl Vogt & Yung) are nonsense; 

 Gaubert has attempted to show that they permit »aux araig- 

 nées de percevoir les sensations de chaleur», but his ex- 

 periment is not convincing; «il est en outre probable que ces 

 organes perçoivent des sensations du même ordre, telles que 

 l'humidité et peut-être toutes les sensations générales». Ber'J- 

 KAU, W. Wagner, and Schimkewitsch suppose that they 

 are auditory organs; the last-named author compared them 

 with the chordotonal organs in Insects, which probably are 

 auditory. 



In Scorpions still two other kinds of sensory organs are 

 known. One of these is the combs (pectines), which have 

 been well elucidated by Gaubert (op. cit. p. 91 — 96). The 

 .second kind of organs has been discovered by me (H. J. H. 

 a, p. 148 — 149); they are placed on the upper side of the 

 last tarsal joint of all walking legs, and here I may only 

 refer to the description quoted, though it contains too little 

 of histological particulars. 



On the fingers of the large chelae in species of Cherms 

 (of the order Chelonethi) and on the movable finger in a 

 species of Chelifer I found in 1893 (H. J. H. a, p. 218) or- 

 gans which as to structure are similar to those on the upper 

 side of the tarsus in Scorpions, excepting that in the Chelo- 

 nethi the organs are simple, in Scorpions collected in a single 

 group or in two groups. — In Solifugse two kinds of pecu- 

 liar organs have been found. The «raquettes coxales» or 

 »malleoli», which are found on the three proximal joints of 

 the last pair of legs, are very conspicuous; they have been 

 well examined by Gaubert (op. cit. p. 96- 98). The same 

 author discovered and described (op. cit. p. 98 — lOO) a ver}- 

 peculiar sensory organ at the end of the palps and of the 

 first pair of legs, and he said that these four organs perhaps 

 have an auditory function. 



In Araneae F. Dahl (/^ p. 6 — 9) found in the mandibles 

 (maxillee auct.) an organ, which he believed to be olfactory, 

 but later in the same year (1884) Bertkau studied the same 



