AEANEAE 



429 



Fig. 675 



Tibellus 



oblongus 



(Emerton). 



E. latithorax Keys. Length 3 mm.; color gray and white, with 

 black spots; body very wide; head narrow in front. 



6. TIBELLTJS Simon. Body long and slender, the legs 

 projecting ahead and behind and not sideways; both 

 rows of eyes curved: 2 American species. 



T. oblongus (Walckenaer) (T. duttonii Emerton) (Fig. 

 675). Length 12 mm.; width 2 mm.; color gray or yellow, 

 with dark longitudinal bands and a pair of black spots 

 on the hinder part of the abdomen: very common on 

 bushes and grass. 



FAMILY 11. CLUBIONIDAE. 



Light-colored spiders usually without color markings; 

 upper row of eyes longer and the eyes usually larger 

 than the under row; mandibles of females swollen at 

 the base : the animals live in flat tubular webs in rolled-up 

 leaves or on plants and under bark and stones; about 95 

 American species. 



Key to the genera of Clubionidae here described: 



a^ Posterior spinnerets with a very distinct, conical terminal segment. 

 &! Labiuni much longer than wide and extending beyond the middle of the 



maxillae 1. CLUBIONA 



5 a Labium about as long as wide or less so, and not extending beyond the 

 middle of the maxillae ; sternum extending between the hind legs. 



2. PHEUBOLITHUS 



a a Posterior spinnerets with a very short and fre- 

 quently indistinct terminal segment. 

 &! Cervical groove present. 



c x Legs spiny 3. CASTIANEIBA 



c 2 Legs not spiny 5. TKACHELAS 



6 2 Cervical groove absent 4. MICARIA 



1. CLUBIONA Latreille. Hinder legs longer 

 than forward; spinnerets distinctly segmented; 

 labium longer than wide ; mandible long ; eyes very 

 near the front margin of head : about 20 American 

 species. 



C. obesa Hentz (C. crassipalpis Keyserling) 

 (Fig. 676). Length 6 mm.; pale in color, without 

 markings; mandibles and ends of male pedipalps 

 dark; eyes in each row equidistant, the hinder 

 row being the longer: common. 

 2. PHRUROLITHUS Koch. Each terminal claw with 6 to 10 spatu- 

 late hairs; sternum broad and extending between the hind legs: 8 

 American species. 



Fig. 676 CluUona 

 obesa (Emerton). 



