M. A. Stecker on a new Genus of Arachnida. 241 



show clearly the near relationship of the Cjphophthaltnidgs on 

 the one hand with the Phalangiidse, and on the other with the 

 Chernetidae ; and I believe that I have demonstrated it. 



I now divide the third section of the Autarachnea, i. e. the 

 section Arthrogastra, in accordance with their affinities, into 3 

 subsections and 6 orders, as follows : — 



III. Aktheogastra. 



1 . SoUfugce. 

 a. GaleodejB. 



2. Opilionea. 



h. Phalangiidse. 



c. Cyphophthalniidti'. 



3. Didactyla. 



d. Chernetidfe. 



e. Phrynidie. 



f. Scorpionid^e (the most highly organ- 



ized order of Arthrogastra)*. 



The order Cyphophthalmidas may be defined as follows : — 



Ordo CyphophthalmidsB, Joseph. 



Coi-pus oblongo-ovatum ; ccphalothorax cum abdomine coalitus, non 

 divisus, abdomen anuulis octo compositiim. Antenuae cbclatfc 

 tribus articulis compositse. Palpi duo filiformes, apice uuguiculo 

 uno armati. Pedes octo antrorsum vel retrorsum gressorii, sim- 

 plici uuguiculo terminati. Ocub iu gibbis conicis, ex utroque 

 thoracis latere prominentibus positi. Eespiratio trachealis. 



(Body oblong-ovate ; ccphalothorax coalescent with the 

 abdomen, not separated j abdomen of eight segments. Cheli- 

 cera three-jointed. First pair of maxillary palpi filiform, Avith 

 one claw at the apex. Eight legs, fitted for walking forwards 

 and backwards, fm-nished with a simple claw at the apex. 

 Eyes placed upon conical tubercles, arising upon both sides 

 of ccphalothorax. Respiration tracheal.) 



In accordance with the external habit of the two genera, 

 the whole order is divided into two famihcs {Cyj^hojyhthahnino', 



* As we refer the Pantopoda, Tordigrada, aud Linguatulina to the 

 Psciidarachnea, we have as the first section of tlie AutaraclinoH tlie Acarina, 

 as the second the Araneina, and the third section is then formed by the 

 Arthrogastra. 



