Spiders and Their Near Relatives 



CC. Body reddish or yellowish brown. 



D. Fingers paler than the .hand, yellowish, otherwise 

 dark red-brown, spine under the sting often small 

 and blunt. Occurs in Florida. 



Centrums margaritatus 

 DD. Fingers usually darker than the hand. 



E. Colour yellowish brown, combs with rarely more 

 than twenty-four teeth, spine under the sting 

 not very prominent. Occurs in southern Florida. 



Centrums testaceus 

 EE. Colour reddish brown, combs with usually more 

 than twenty-five teeth, spine under sting well- 

 developed, usually much larger than the preceding. 

 Occurs in Florida. Centrurus gracilis 



Family SCORPIONIDiE (Scor-pi-on'i-dae) 



In this family there is only one spur at the base of the last 

 tarsal segment of the last pair of legs and this is on the outside. 

 The lateral margins of the sternum are nearly parallel. There 

 are no spurs at the end of the first tarsal segment of the third 

 and fourth legs. There are three lateral eyes on each side. The 

 hand is usually flattened, seldom rounded, and there is rarely a 

 spine under the sting. Two genera occur in our fauna. 



A. With a hump under the sting (Fig. 32). Diplocentrus 

 AA. Without a hump under the sting. Opisthacanthus 



Genus DIPLOCENTRUS (Dip-lo-cen'trus) 



Two species belonging to this genus are found within the 

 limits of the United States. 



Diplocentrus whitei (D. whi'te-i). — This is a Mexican species 

 which is found in Texas and California. It can be distinguished 

 from the following by the presence of from twelve to eighteen 



teeth in the comb. The full-grown male 



measures nearly or quite two inches in length. 



Diplocentrus lesueurii (D. le-su-eu'ri-i). — 



This species was described from Florida. It 



Fig. 32. sting of differs from the preceding in having only 



DIPLOCENTRUS r . . . . . , i 



whitei from six to eight teeth in the comb. 



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