Superfamily Argiopoidea 



spider comes forth with amazing swiftness, seizes the unlucky 

 insect, and retreats with it instantly to its lair. 



About the first of July one of my specimens removed all of 

 that part of the nest that was on the face of the block, leaving 

 only the tube within the hole. She then laid about fifteen eggs. 

 These were large and were in a spherical mass but not enclosed 

 in an egg-sac. 



Family OONOPID^ (O-o-nop'i-dae) 



The Oonopids (O-o-nop'ids) 



These are six-eyed spiders which resemble the dysderids in 

 having four spiracles, a pair of lung-slits and a pair of tracheal 

 spiracles. But in this family the tracheal spiracles are incon- 

 spicuous, and the coxae of the four pairs of legs are similar and 

 nearly globose. 



Only three species belonging to this family have been found 

 in the United States; these represent two different genera, which 

 can be separated as follows: 



TABLE OF GENERA OF THE OONOPIDS 



A. Abdomen soft. Orchestina 



AA. Abdomen covered by a horny shield. Gamasomorpha 



Genus ORCHESTINA (Or-ches-ti'na) 



Two species of this genus have been found in our fauna. 



Orchestina saltitans (O. sal'ti-tans).— - This species was found 

 by Mr. Banks at Sea Cliff, N. Y. It measures less than one 



twentieth inch in length ; the 

 cephalothorax is whitish, 

 with a black marginal line 

 and a black spot around the 

 eyes; the abdomen is pur- 

 plish above, quite dark near 

 the tip; the venter is pale, 



Fig. 290. orchestina saltabunda and the s P inner ets are 



white. When disturbed 



the spider leaped backward. 



Orchestina saltabunda (O. sal-ta-bun'da). — This species was 



described by Simon from Venezuela. A single male, taken in New 



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