252 



ARACHNOIDEA. 



CASE mentary character being confined to the last pair of legs, is suffi- 

 cient to make a sub-genus for their reception necessary. We 

 give figures of the two that have been described : nothing is 

 known of their development as yet. 



Trichodactylus osmi^ {r>iif.). 



Tricliodactylus osmiae. Copied from 

 original figure by Dufour. 



Trichodactylus osmiK. Copied from figfure by Donnadie;]. 



Found on a species of Osmia. It will be seen that it has the 

 mouth-piece of Hypopus with its two projecting bristles. 



No. 5. Trichodactylus xylocop^.— 6. Magnified sketch of ditto, copied from 

 figure. 



Found on Xylocopa violacea. There is some appearance of 

 transverse lines on the surface of this and the preceding species, 

 but we have had no means of ascertaining how far they are of 

 the same character as those on the Sarcoptidse. The hair ter- 

 mination of the last pair of legs undoubtedly has some affinity to 

 that group, and it is obvious that we are approaching its terri- 



