Spiders and Their Near Relatives 



Genus TITYUS (Tit'y-us) 



There are many overlapping oblique rows of teeth on the 

 of the fingers of the chelae (Fig. 30). The following is the 

 only species found in the United States. 

 Tityus Jloridanus (T. flor-i-da'nus).— 

 This is a dark, red-brown species measur- 

 ing nearly three inches in length, found 

 at Key West. The sting is long and 

 curved; the tooth beneath it is acute, but 

 short. 



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Genus CENTRURUS (Cen-tru'rus) 



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Fig. 3°- 



Fig. 31- 

 FINGER OF 

 CENTRURUS 



The oblique rows of teeth on the 

 edge of the fingers of the chelae have on 

 each side a parallel row of minute teeth 

 (Fig. 31). There is a tooth on the lower 

 margin of the fixed finger of the chelicerae, 

 fingerof and a spine under the sting may be either 



TITYUS .• 



present or wanting . 

 Banks (00) lists seven species of this genus that are found 

 in our fauna. He separates them as follows: 



A. No spine under the sting; postabdomen very long and 

 slender. Occurs in California. Centrums exilicauda 



AA. At least a small spine or tubercle under the sting; post- 

 abdomen less slender. 

 B. Body striped with black and yellow. 

 C. A small pale median spot on the anterior border of the 

 cephalothorax, legs pale yellow, postabdomen pale. 

 Occurs in the Southern States. Centrums caroliniauus 

 No such median spot on the anterior margin of the 

 cephalothorax, legs marbled with brown, postabdomen 

 brown, dark stripes on the cephalothorax, broader 

 than the preceding species. Occurs in Florida. 



Centrums hent{i 

 Body nearly uniform reddish brown or blackish. 



Body a dark greenish black, cephalothorax very rough, 

 postabdomen strongly granulate. Occurs in Texas. 



Centrums nigrescem 



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CC. 



BB. 



