Peckham — Spiders of the Family Attidae. 337 



markings change to a pale golden color, and are seen to be 

 formed of scales, while between them the surface of the abdo- 

 men is covered with hairs of a rusty red hue. 



The anterior eyes, which form a curved row, are not strik- 

 ingly large, as in valida. The cephalic plate is more strongly 

 inclined in the male than in the female. 



We have two males and two females from Xew Grenada. 



Dynamius Simon. 1887. 

 PL XXY, figs. 6-6b. 



Ann. de la Soc. Ent. de France, Arachn. de V Amerique Cen- 

 irale et des Antilles, p. 204. 



Type, Joins opimus Peckham, Proc. Xat. Hist. Soc. of Wis- 

 consin, 1885, p. 71. The drawing shows the spider as it ap- 

 pears under alcohol, the pattern not coming out distinctly. 



This genus is found in Central and South America and the 

 West Indies. The spiders are usually of medium size or a 

 little smaller, with long, rather heavy legs which are not very 

 unequal in length, the most common leg formula being 34rl2. 

 It is verv close to Escambia. 



The cephalothorax is high, convex, massive, and long. The 

 sides, which slant outward from the upper surface, are nearly 

 parallel until just in front of the posterior border in the type, 

 and are alwavs Avidest behind the dorsal eves. The males have 

 a cheek-like swelling in front. The cephalic part is strongly in- 

 clined. The thoracic never falls directly from the dorsal eyes, 

 some species having a short rounded thoracic plate, while others 

 are flat for a considerable distance. 



The quadrangle of the eyes is only about one-fourth wider 

 than long, is equally wide in front and behind or a little wider 

 in front, and occupies barely two-fifths of the cephalothorax. 

 The eves of the first row are larsre and form a curved line. In 

 opimus they are all well separated but in the other species they 

 are near together. The middle eyes are plainly less than twice 

 as large as the lateral. The second row is variable in position. 

 The third row is narrower than the cephalothorax at that place. 

 Of this genus we have in our collection opimus, the type, from 

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