246 ENTOMOLOGISK TIDSKRIFT I917. 



a similar seta is found, and the area around its insertion is 

 considerably raised and shows a sculpture difterent from that 

 of the surrounding parts. In Ogovia H. J. H. & W. S., 

 Siro Latr. and Parasiro H. J. H. & W. S. I could not find 

 this seta, but I did not make a special prseparation for that 

 purpose. In all genera dissected, viz. Stylocelhis, Purcellia. 

 Sii'O, and PaTasiro, I found two small sensory hairs on the 

 upper side of the head a little from the front margin and 

 near or rather near one another; this pair of setae occur con- 

 sequently both in forms without and in forms with eyes of this 

 suborder, but in the two oiher suborders no such sersory setae 

 have been observed. If the Cyphophthalmi are compared with 

 the Palpigradi, one is tempted to suppose that the two upper an- 

 terior setae in the former group answer to the front bifid sensory 

 organ in the last named order, consequently at least to some 

 degree to the front pair of eyes in Thelyphomis; if so, the 

 two eyes in most Opiliones answer not to the frontal eyes but 

 to the two groups of sublateral eyes in Thelyphonus and 

 other Pedi|)alpi, and a further result would be that the sublat- 

 eral sensory seta in some blind Cyphophthalmi answers to the 

 sublateral sensory hair or bundle of hairs in the Palpi- 

 gradi. 



In all tiiree suborders of Opiliones sensory hairs orseta^ 

 are found on the legs. In the Cyphophthalmi they exist 

 only on a shorter or longer distal part of the upper side of 

 the tarsus of the two anterior pairs of legs; these setae, 

 from four to nearly a dozen on each tarsus, show- 

 generic differences, but they are always light of colour, 

 somewhat curved, rather stout with the end obtuse, 

 and they are easily distinguished from the other setae. — 

 Of the suborder Laniatores forms of three families, viz. 

 Assamoidae, Cosmetoidae and Gonyleptoidae, have been exam- 

 ined. The tarsus of the two anterior pairs of legs has 

 above a few sensory setae of the same somewhat elongate 

 kind as in the Cyphophthalmi, and besides the tarsus and the 

 metatarsus possess sensory setae of another kind; in the 

 two posterior pairs of legs the upper distal face of the me- 

 tatarsus has a single stout sensory seta. In Cosmetoidae and 

 Gonyleptoidae the tarsus of the two posterior pairs has on 



