CHIGGERS — FARRELL 233 



Explanation of plates 9-21 

 Details of appendages of species of Eiischongastia 



Plate 9. — E. laccrta and E. bigenuala 



Left: Euschongastia lacerta. Segments of palp and legs are indicated by number. 

 Setae of each segment are shown. A figure within parentheses indicates the number of 

 feathered setae on the segment. A seta not in parentheses occurs alone on the segment. 

 Striated setae follow feathered setae in the illustrations. Striated setae of the legs are 

 sketched on the segments. The segments of the palp are: 1, coxa; 2, femur; 3, genu; 4, 

 tibia; and 5, tarsus. Illustrations of the tibia show the dorsal seta, lateral seta, ventral 

 seta, and the palpal claw, in that order. The pairs of legs are numbered, anterior to 

 posterior, I, II, and III. The segments of the legs are: I, coxa; 2, trochanter; 3, basi- 

 femur; 4, telofemur; 5, genu; 6, tibia; and 7, tarsus. The coxa of leg III is shown with 

 seta attached. Claws and empodium of leg III are illustrated. Cheliceral blade is shown 

 in dorsolateral view, dorsal tooth exposed. All legs illustrated are from the right side 

 of the specimen. 



Right: Euschongastia bigenuala. Leg I from left side of specimen; legs II and III 

 from right side. Segments 6 and 7 of leg II sketched dorsal surface down, as they ap- 

 peared on the specimen. See above for explanation of general organization of drawings. 



Plate 10. — E. trigenuala and E. nunezi 



Left: Euschongastia trigenuala. Cheliceral blade partly covered by cheliceral base. 

 Drawings of two palpal claws, showing variation. Legs I and III from the right side of 

 the body. Leg II from the left side. Several specimens from the type series were used 

 for the drawings. 



Right: Euschongastia nunezi. On palp 5 in this species is an extra, pointed seta. 

 Blade missing from chelicera. Segment 7 of leg III with a mastitarsala. All legs from 

 the right side of the body. 



Refer to explanation of plate 9 for general organization of drawings. 



Plate 11. — E. oregonensis and E. pipistrelli 



Left: Euschongastia oregonensis. Cheliceral blade partly covered by cheliceral base. 

 All legs from right side of body. Drawings from a cotype. 



Right: Euschongastia pipistrelli. Medial view of blade of chelicera, teeth concealed. 

 All legs from right side of body. 



Refer to explanation of plate 9 for general organization of drawings. 



Plate 12. — E. cordiremus and E. peromysci 



Left: Euschongastia cordiremus. Lateral view of blade of chelicera, teeth exposed. 

 All legs from the right side of the body. Drawings from a paratype. 



Right: Euschongastia peromysci. Base of chelicera badly crushed on the specimen 

 and omitted from the drawing. All legs from the right side of the specimen. Drawings 

 from holotype. 



Refer to explanation of plate 9 for general organization of drawings. 



