1919] Chamberlin: Western Spiders 243 



Dictyna vincens sp. nov. 



Female — Carapace and sternum fuscous. Legs yellow to ]jalc 

 brown. Abdomen above at base with a black mark having caudal end 

 excised in an obtuse re-entrant angle and on each side the usual dark 

 lines radiating from its angles and edges ; behind the middle first a pair 

 of widely separated dark spots and then typically two exceptionally 

 thick chevrons, which sometimes give the caudal end the appearance 

 of being almost solid black; sides often darkened; venter either uniform 

 or with a dusky or blackish band over its length, or with a black area 

 only in front of spinnerets. Anterior median eyes essentially equaling 

 the laterals, their diameter apart, closer to the laterals. Posterior 

 eyes equidistant. Area of median eyes as wide in front as behind. 

 Epigynum, Plate XV, Fig. 1. 



Male — In what is regarded as the male of this species the coloration 

 is similar to that of the female though the general appearance of the 

 abdomen is darker and more uniform with the markings less distinct 

 and sometimes almost obliterated. The palpus is shown in Plate XV> 

 Fig. 2. 



Length of female, 3.25 mm.; of male, 2.5 mm. 



Type— M. C. Z. 410. Washington: Olympia. 



Dictyna ol3mipiana sp. nov. 



Male — This small form has the usual general coloration ; the carapace 

 and sternum dusky brown; legs yellow; abdomen at base above with a 

 median dark line expanding into a triangular spot in front of middle, 

 this followed behind by the usual pairs of longitudinally connected 

 spots, the sides also dark. Anterior median eyes smaller than the 

 laterals and than the posterior medians. Area of median eyes clearl}^ 

 wider behind than in front. The species is readily characterized by 

 the large size of the tarsus of the palpus and the fonn of the particularly 

 large palpal organ. The process of tibia is small, erect, and bidentate, 

 the teeth being equal. See further Plate XV, Fig. 7. Chelicera rather 

 small, slightly bulging at base in front, but without a true process or 

 tooth. 



Length, 1.7 mm. 



Type— M. C. Z. 408. Washington: Olympia. 



Dictynoides gen. nov. 

 Pars cephalica broad, 1o\a-, not gibbous. Anterior row of eyes 

 straight, the eyes equal or the medians smaller. Lateral eyes on each 

 side subcontiguous. Posterior row of eyes "straight, eyes equidistant 

 or the median farther apart than from the laterals. Area of median eyes 

 quadrate or trapeziform, wider than long. Ch'pcus with height much 

 exceeding the diameter of the anterior eyes. Chelicera^ long, with lower 

 margin armed with two or three teeth. Labium broad, moderately 

 narrowed distad, extending a little beyond middle of enditcs. Endites 

 oblique, inclined. Cribellum entire. Legs without spines. 



