Superfamily Argiopoidea 



argiopids by 

 reproductive 

 of the female 

 being merely 

 418) are more 



the simplicity of the structure of their external 

 organs. The opening of the reproductive organs 

 is furnished with neither an atriolum nor a scape, 

 a transverse slit; and the palpi of the males (Fig. 

 simple than in the other divisions of the Argiopidae; 



being of the intermediate type. 



(See page 1 10 for description.) 



emb. 



-p. c. 



cym.-— 



Fig. 418. GENITAL BULB OF 

 PACHYGNATHA, EXTENDED 



Fig. 419. VENTRAL ASPECT OF 

 TETRAGNATHA LABORIOSA 



The Tetragnathinas agree with the Metinas in the absence of 

 transverse furrows on the epigastric plates; but can be distin- 

 guished from them by the fact that the epigastric furrow between 

 the spiracles is procurved (Fig. 419), by the absence of a lateral 

 condyle on the chelicerae, and by the fact that the furrow of the 

 chelicerae is armed with numerous teeth. 



Four genera of the Tetragnathinae are represented in our 

 fauna; these can be separated by the following table: 



TABLE OF GENERA OF THE TETRAGNATHIN/E 



Fndites more or less convergent and not dilated at the distal 

 end; lateral eyes on each side near together; tarsi with- 

 out accessory claws. 



406 



