434 



ARACHNIDA 



Fig. 683 Fir at a, 

 piratica (Emerton). 

 A, dorsal aspect ; B, 

 front view, showing 

 the eyes. 



4. PIEATA Sundevall. Labium longer than broad; first row of eyes 

 as broad as the second: beneath stones and in the grass near the water 

 over the surface of which they may freely run; 16 American species. 

 P. piratica (Clerck) (P. marxi Stone) (Fig. 683). Length 6 mm.; 

 color pale yellow with gray or black markings; 

 eyes of the second row about half their diameter 

 apart. 



FAMILY 15. ATTIDAE.* 



Jumping spiders. Eyes in 3 rows, the front 

 row usually curved and composed of 4 large eyes, 

 the second row of 2 very small eyes, the third row 

 far back on the head and composed of 2 large eyes 

 which are usually turned a little backward; cepha- 

 lothorax large and wide in front; legs strong and 

 short and with 2 terminal claws on each; body cov- 

 ered with hairs or scales: no web made, but some 

 species make silk bag-like retreats on plants and 



under stones; the spiders run and jump sidewards and backwards as well 



as forwards; about 213 American species. 



Key to the genera of Attidae here described : 



! Body not shaped like an ant. 

 &! Abdomen not longer than the hind legs. 

 Cj Body not noticeably flattened. 

 di Front row of eyes not touching one another. 



i Eye area broader than long, body short and wide 1. ATTUS 



e 2 Eye area not broader than long. 



/! Eye area somewhat wider behind than in front 2. PHIDIPPUS 



/ 2 Eye area quadrangular 3. DENDRYPHANTES 



d 2 Eyes of front row touch one another 4. S ALTICUS 



c 2 Body noticeably flattened 5. MABPISSA 



& 2 Abdomen longer than hind legs 6. HYCTIA 



o 3 Body like an ant in shape 7. SYNEMOSYNA 



1. ATTTTS Walckenaer. Eye area broader than long; 

 first leg with 2 rows of spines on distal half; third leg 

 shorter than the fourth: about 6 American species. 



A. palustris Peckham (Fig. 684). Length 6 mm.; 

 color brown or gray, with a median white line on the 

 cephalothorax; abdomen with white spots and markings: 

 on plants, with nests among the leaves. 



2. PHIDIPPUS Koch. Cephalothorax high; eye area wider behind 

 than in front ; first leg thick and long ; third leg shorter than the fourth : 

 about 50 American species. 



* See "Attidae of North America," by G. W. and E. G. Peckham, Trans. Wis. 

 Acad. Sci., Vol. 7, 1888. "New England Spiders of the Family Attidae," by J. H. 

 Emerton, Trans. Conn, Acad., Vol. 6, p. 220, 1891. 



Fig. 684 At- 



tus palustris 



(Emerton). 



