PEDIPALPI 



407 



pair the terminal portion very much elongated and forming a long, 

 many- jointed tactile flagellum; pedipalps thick and strong and, like the 

 mandibles, either chelate or not; 2 pairs of book lungs on the third and 

 fourth abdominal segments; 8 eyes usually present, 2 large ones in front 

 and 3 small ones on each side; genital pores paired and on the first 

 abdominal segment: predacious tropical animals, 5 species of which are 

 found along the southern border of this country; 3 families and about 

 60 species. 



Key to the families of Pedipalpi here described : 



01 Long filiform tail present 1. THELYPHONIDAE 



2 No such tail 2. TARANTULIDAE 



FAMILY 1. THELYPHONIDAE. 



Whip scorpions. Body elongate; pedipalps chelate; 'abdomen 12- 

 jointed, the last 3 segments smaller than the others and bearing a long, 

 jointed terminal filament and also often om- 

 matoids, white ocellus-like spots: 10 genera and 

 about 40 species. 



MASTIGOPROCTITS Pocock. Two ommatoids 

 present: 17 species. 



M. giganteus (Lucas). Vinegar roan (Fig. 

 642). Length (with tail) 13 cm.; color dark 

 brown; tail with reddish hairs; animal has a 

 strong odor of vinegar : Florida to Arizona, often 

 common in dry sandy places; they are nocturnal 

 Fig. Q42Ma8tigoproc- animals which are much feared, although they 



tus giganteus 



(Comstock). are not poisonous. 



FAMILY 2. TARANTTJLIDAE. 



Body broad, cephalothroax being broader than 

 the abdomen and joined with it by a slender waist; 

 pedipalp ends with a claw; abdomen 11-jointed and 

 without a terminal filament: 10 genera and about 

 18 species. 



Tarantula Fabricius. Foot with a single claw; 

 front margin of celphalothorax either with short 

 teeth or smooth: 4 species, all American. 



T. white! (Gervais) (Fig. 643). Front margin 

 of cephalothorax denticulate; inner margin of pedipalp with long 

 spines; color brown with a yellow margin; length 20 mm.: Texas to 

 California. 



Fig. 643 



Tarantula ichitei 

 (Banks). 



