PSYCHE. 



ORGAN OF THE CAMBRIDGE ENTOMOLOGICAL CLUB 



EDITED BY B. PICKMAN MANN. 

 Vol. I.] Cambridge, Mass., November, 1876. [No. 31. 



Synoptical Tables for determining N. A. Insects. 

 Scorpiones. 



In the Annals and Mag. Nat. Hist., ser. 4, vol. xvii, p. 1-15 

 (Jan. 1876), Prof. T. Thorell has published an essay on the 

 classification of Scorpions [see Rec, No. 619], from which the 

 following synopsis of genera is adapted. The synopsis is pref- 

 aced by the following scheme of the orders in the class Arach- 

 noidea, indicating the relative position of each. 



Class Arachnoidea. 

 Subcl. 1. Thoracopoda Thor. 



Orel. 1. Scorpiones. Ord. 5. Solifugae. 



Orel. 2.» Pedipalpi. Ord. 3. Araneae. 



Orel. 6. Pseueloscorpiones. Orel. 4. Opiliones. 

 Orel. 7. Acari. 



Ord. 8. Linguatulina ( = fam. Pentastomoidae). 

 Subcl. 2. (Ord. 9.) Cormopoda Thor. (= fam. Artiscoidae). 



1 (18) Sternum narrowing forwards, subtriangular. [Intermediate plates 

 of the pectoral combs 1 rather few in number, most of them angular 

 and larger than the fulcra, and forming only one series. The mov- 

 able finger of the mandibles (which always forms a perfect fork) has 

 two rows of teeth; the immovable finger lias two teeth in the upper 

 margin, 2-0 in the under. Tbe fingers of the palpi are provided 

 with a number of oblique rows of fine teeth, along the middle of their 



1 Thc plates of the front row are called dorsal plates; those of the hind row, each 

 supporting a tooth of the comb, arc the fulcra; those between are the intermediate 



Jilnti 8. 



