No. 1.] ATTID.E OF CENTRAL AMERICA. 7 



IS. Fang of falx with tooth near its insertion, 



Helorus mandibularis (page 29 



Fang of falx without tooth, . Helorus extensus (page 30 



19. Falces oblique, 20 



Falces vertical, 25 



20. Falces small, round, but little wider than middle eyes, 



Bagheera Kiplingii (page 88 



Falces stout, much wider than middle eyes, . . 21 



21. Spiders small, about 4 mm. long; legs with a black 



longitudinal line on the anterior side, visible from 

 below ; coxa and trochanter of first leg visible from 



above, Zygoballus rufipes. 



Unlike the above, ....... 22 



22. Spiders 4 to 6 mm. long ; falces about as wide as long, 



a little inclined (see figure), . Dendryphantes ruber. 

 Unlike the above, 23 



23. Spiders 6 to 8 mm. long ; falces long, narrowing 



toward the extremity, with a long fang, 



Dendrypbantes nitidus (page 53 

 Spiders at least 9 mm. long, ..... 24 



24. Falces long, heavy, with a large triangular apophysis 



on middle of inner side of each, fang long, curved, 



. Phidippus orichalceus. 

 Falces long, tapering toward extremity, without any 

 projection or apophysis on inner sides ; fang long, 

 curved, .... Phila^us luteus (page 40 



25. More or less red on abdomen,* 



No red on abdomen, .... 



26. Palpus with white hairs, excepting on tarsus. 

 Palpus without white hairs, . 



26 

 29 



27 

 28 



* One of our three specimens of Menemerus fannse has a strong red tinge in the mark- 

 ings, while the others would he called brown. To avoid confusion we run this species out 

 under both heads. 



