- 3 8- 



Postmarginal longer than stigmal; neck of metathorax short; abdomen oval- 

 rotund; vertex broad Subgenus Diglochis Thomson. 



Postmarginal shorter than stigmal or equal to it. 

 Abdomen oblong. 



Vertex rounded in the middle, 9 abdomen ovate, convex below ; 9 wings 

 often marked with large smoky discs; club of 9 antennae small, 



shorter than pedicel Subgenus Arthrolytus Thomson. 



Vertex acute in the middle Subgenus Dibrachys Thomson 



Abdomen rotund; cheeks compressed, acute; wings hyaline, postmarginal 

 shorter than stigmal Subgenus Ccelopisthus Thomson. 



Genus METOPON. 



antennae strongly incrassate, sub-clavate; $ antennae verticillate-pilose 



Subgenus Metopon Walker. 

 C antenna 1 with the flagellum of equal width throughout, $ antenna' pubescent or 



densely clothed with short hairs; 9 abdomen rotund 



Subgenus Dirhicnus Thon 

 (To be continued.) 



Notes on Thelyphonus Latr. 

 By Geo. Marx, m.d. 



There is a group among the Arthrogastra, to which Latreille has 

 given the name Pedipalpi. This term can be interpreted in two ways, 

 either, the palpi are like legs, or the legs are like palpi. "Palpi brachia 

 cemulantes", says Latr., "the palpi resemble arms". If he had intended 

 to introduce this idea into the name, he should have called the group 

 Brachiopalpi. But he was correct in naming it Pedipalpi, for the anterior 

 pair of legs are here functionally no motor organs; but their strucrure 

 and insertion prove that they are the, here retained, 2nd maxillary or 

 labial palpi of the insects, which are transformed in all other Arachnida 

 into leg-like structures with motor functions, giving thus the whole class 

 the characteristic 8 legs, and which are here exceptionally preserved in 

 their original form. 



While the insertion of the 8 legs in all Arachnides is on one plane, 

 either in close apposition or radiating from the sternum, we find in 

 the Pedipalpi ?A their sternal surface only 6 coxae surrounding the sternal 

 plate and the insertion of the first pair is at the pleural side and in the 

 upper outer border of the maxilla;. 



The difference in the structure between the anterior and the other 6 

 legs is remarkable. The former are not half as thick, but at least twice 

 as lung as the latter. The tibia represents in the other .six legs one joint 

 (in Phrynus sometimes two and three) while it has in the front pair — at 



m some — 27 to 37 joints, and the tarsus 8, 65, or even as man) as 

 85, when it has in the other 3 pair only 3 joints. 



