ARANEAE 



427 



6. Mangora Hentz. Thorax elevated beliind and with a deep 

 median furrow; second row of eyes straij^ht or curved backwards: 3 

 American species. 



M. gibberosa (Hentz). Body 5 mm. long and light yellow or gray 

 in color, the abdomen with 2 parallel black lines 

 on the hinder half, and a number of small black 

 spots: web with about 60 radial spokes and the 

 cross spirals very close together. 



7. Tetragnatha Latreille. Slender, light- 

 colored spiders living in their webs in the long 

 grass in meadows and near water; mandibles 

 large, extending forward and divergent: about 

 4 American species. 



T. extensa (L.). Length 6 mm., with abdo- 

 men twice as long as the cephalothorax; color 

 yellowish-brown or gray. 



8. Leucauge White. Elongated spiders with 

 the lateral eyes near together and nearly equal in 

 size; 3 claws on the feet: 2 American species. 



L. hortorum (Hentz) (Fig. 671). Body 6 mm. long; cephalothorax 

 and legs bright green; abdomen silvery white above, with a dark line 

 tlirough the middle with red and yellow spots: web large, with a zigzag 

 band of silk across the center. 



- Leucauge 

 hortorum (Emerton). A, 

 ventral view of female ; 

 B, dorsal view. 



Family 10. THOMISIDAE.* 



The crab spiders. Short, flat spiders, usually widened behind, with 

 a sidewise gait and a crab-like appearance; the first and second pairs of 

 legs much longer than the others and extended at right angles to the 

 body; 2 claws on each foot; eyes in two curved rows: about 114 Ameri- 

 can species, which are found on walls, flowers, and similar places; they 

 do not make a web. 



Key to the genera of Thomisidae here described: 



a^ Body and legs crab-like. 

 &i Lateral eyes on tubercles. 

 Cj Two eye tubercles on each side. 



di Hinder eye tubercle the larger 1. Tmarus 



d^ Front eye tubercle the larger 8. Xysticus 



Co A single eye tubercle on each side 2. Misumena 



&2 No eye tubercle present. 



Ci Labium much longer than wide 4. Philodkomus 



Ca Labium not longer than wide 5, Ebo 



02 Body long and slender, not crab-like - 6. Tibellus 



* See "New England Spiders of the Family Thomisidae," by J. H. Emerton, 

 Trans. Conn. Acad., Vol. 8, p. 359, 1892. 



