NO. 2167. SEVEN NEW SPECIES OF RED SPIDERS— MCGREGOR. 589 



EXPLANATION OF PLATES. 



[Drawings by the author.[ 



Plate 101. 



Tetranydius peruvianus. 

 Fig. 1. Female, dorsal view. 



2. Male, dorsal view (bristles not shown). 



3. Left eye, seen from above. 



4. Mandibular plate, showing normal extrusion from cephalothorax. 



5. Left foreleg, seen from above. 



6. Extremity of left palpus (viewed from outside), showing "thiunb," "fingers," 



claw, and other appendages. 



7. Tarsal appendages (lateral view), showing onychimn, claw, and tenent hairs. 



Figures 3, 4, 6, and 7 were drawn with oil-immersion lens and camera lucida. In 

 figures 1 and 2 the legs are shown foreshortened through lack of uncontracted specimena, 



Plate 102. 

 Tetranydius rusti. 



Fig. 1. Male, dorsal view, bristles not drawn. 



2. Mandibular plate, showing also stylets and spina. 



3. Profile view of typical dorsal appendage. 



4. Tarsal appendages (lateral view), showing onychium, terminal protruber- 



ances, and tenent hairs. 



5. Extremity of left palpus (viewed from inside), showing "thumb," "fingers," 



claw, and other appendages. 



6. Female, dorsal view. 



Figm-es 2, 3, 4, and 5 were drawn with oil-immersion lens and camera lucida. 



Plate 103. 



Tetranychus monticolus. 

 Fig. 1. Pern's, lateral view. 



2. Collar trachea, from right side. 



3. Tarsal appendages of leg II of female (lateral view), showing onychium, claw, 



and tenent hairs. 



4. Tarsal appendages of male (lateral view). 



5. End of right palpus (viewed from outside), showing "thvmib," "fingers," 



claw, and other appendages. 



6. Frontal and subfrontal bristles and eye of right side (viewed dorsally). 



Figiu-es 1, 2, 3, 4, and 5 were drawn with oil-immersion lens and camera lucida. 

 Plate 104. 

 Tetranychus oregonensis. 



Fig. 1. Collar trachea, from right side. 



2. Right leg I, from outside. 



3. Profile view of adult female. 



4. Extremity of right palpus (viewed from outside), showing "thumb," "fin- 



gers," claw, and hairs. 



5. Tarsal appendages (lateral view) showing onychium, claw, and tenent hairs. 



Figures 1, 4, and 5 were drawn with oil-immersion lens and camera lucida. 



