Superfamily Argiopoidea 



Genus PLECTREURYS (Plec-treu'rys) 



These spiders differ from all other scytodids in having eight 

 eyes; they are of medium or large size; the cephalothorax and legs 

 are black or brown, while the abdomen is brownish gray, clothed 

 with isolated hairs. The two following species are all that are 

 known. Nothing is known of their habits. 



Pledreurys trisiis. — This species was described from speci- 

 mens taken in Arizona. The male is less than one third inch in 

 length; the female, is more than one half inch. 



Pledreurys castanea (P. cas-ta'ne-a). — Described from south- 

 ern California. The female measures one third inch in length; 

 the male has not been described. 



Genus DIGUETIA (Dig-u-e'ti-a) 



The members of this genus differ from the other six-eyed 

 scytodids in having the anterior eyes in a nearly straight line. A 

 single species has been found in California, others occur in Mexico. 



Diguetia canities (D. ca-nit'i-es). — -"The spider is about 

 three eighths inch long; the cephalothorax brown, the abdomen 

 brownish yellow covered thickly with white hairs, which also 

 strongly mark the cephalothorax, suggesting its specific name. 

 The legs are yellow, with brown rings at the joints, and a similar 

 ring in the middle of the tibia." (McCook.) 



The species was described from specimens taken at San 

 Bernardino, Cal. Doctor McCook ('Sg-'g^, 11, 135) gives 

 an account of its remarkable cocooning habits. The mother 

 spins a series of flattened disks, which are overlaid one upon 

 another like the tiles upon a roof, and are bound by silken threads 

 somewhat after the fashion of Metepeira labyrinthea. This 

 series of cocoons is sometimes three inches or more in length 

 and is covered with leaves from the plant upon which the string 

 is suspended. Along the entire length of one side of the string 

 of cocoons the mother spins a silken tube within which she dwells. 

 The whole is suspended within a maze of threads and is attached 

 above to a strong thread. 



Genus LOXOSCELES (Lox-os'ce-les) 



These are spiders of medium size, of a yellowish or brownish 

 colour and without conspicuous markings; the anterior row of 



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