12 PECKHAM. [Vol. ?,. 



10. Spiders about 10.7 mm. long ; abdomen witli ground- 



color black, and a large spot of bright red hairs on 

 middle of anterior part, behind which is a trans- 

 verse band of wliite liairs ; in front of spinnerets 

 two white spots, .... D^'namius opimus. 

 Spiders about 8 mm. long ; aljdomen red with white 

 markings edged with black, and encircled b}^ a 

 black band, Cytaja concinna. 



11. Legs, 4132 or 4123, ...... 12 



Legs, 4312, 13 



12. Spiders very large, 17 mm. long ; abdomen reddish- 



brown with gray and yellowish hairs ; no distinct 

 pattern, . . . Phidippus georgii (page 34 



Spiders about 14.5 mm. long ; abdomen dull red 

 (yellow in alcohol), with central black band on pos- 

 terior half, which has, at its anterior end, two white 

 spots, .... Phidippus carneus (page 33 



13. Abdomen with basal white band and at least one other 



transverse white band, ..... 14 



Abdomen with or without white basal band, marked 

 with spots, ........ 17 



14. Spiders 9 to 10 mm. long ; abdomen with two trans- 



verse white bands, besides the one at anterior end, 



Pardessus mimicus (page 36 



Abdomen with one transverse white band besides the 

 one at anterior end, ...... 15 



15. Spiders with herring-bone stripe on abdomen, . 16 

 Spiders without herring-bone stripe, .... 



Pachomius flavescens (page 82 



16. Abdomen with a wide transverse white band across 



middle, .... Cyrene delecta (page 68 

 Transverse white band across middle of abdomen 

 broken and irregular, . . Cyrene aprica (page 66 



