Superfamily Argiopoidea 



and then down and forward, so that the tip rests in the apex 

 of the alveolus, near the tip of the tarsus. 



Genus GAYENNA (Ga-y-en'na) 



The spiders of this genus are closely allied to Anyphccna, 

 from which our species differ in having the anterior middle eyes 

 smaller than the anterior lateral eyes and in having the furrow 

 of the posterior spiracle behind the middle of the venter (Fig. 



631, 6). 



Nine species are listed from our fauna, of which the three 

 following are the more widely distributed : 



These three species resemble each other quite closely in size 

 and markings. The body is from one eighth to one fifth inch 

 in length. The colour is pale yellow or white, with two broken 

 gray stripes on the cephalothorax, and two longitudinal rows of 

 gray spots on the abdomen; there are also similar spots on the 

 sides of the abdomen. The only practicable way of separating 

 these species is by the characteristics of the secondary sexual 

 organs, the epigyna and the palpi of the males. The following 

 table will aid in recognizing the distinctive features of these: 



TABLE OF OUR COMMON SPECIES OF GAYENNA 



A. Males. 



B. Tibia of palpus about three times as long as the patella; 



apophysis of tibia apparently arising before the middle 



of its length. G. saltabunda 



BB. Tibia of palpus not greatly elongate; principal apophyses 



terminal. 



C. Terminal apophyses of tibia short; the coxae of the third 



and fourth legs with small apophyses on the lower 



side. G. pectorosa 



CC. Terminal apophyses of tibia long; the coxae of the third 



and fourth legs without apophyses below. G. celer 



AA. Females. 



B. Epigynum longer than wide. G. celer 



BB. Epigynum wider than long. 



C. Posterior edge of the epigastrium prolonged behind 

 over the epigastric furrow into a plate, which is 

 lobed on each side, and which extends to the lung- 



562 



