CHIGGERS — FARRELL .JgS 



setules, usually two to eight. Dorsal seta on palpal tibia with 

 one or two rovv^s of setules; lateral seta usually nude, two out of 

 forty branched ; ventral seta with few setules in two rows. Palpal 

 claw strong with three prongs, median prong longest and strong- 

 est. Galeal seta usually with two setules (table 12). Base of 

 chelicera heavy; blade smooth and curved with distinct subapical 

 dorsal tooth and larger ventral tooth. Palpal coxa and base of 

 chelicera punctate. 

 Anomaly: One specimen with four prongs on one palpal claw. 



Table 12, — Distribution of setules on the galeal setae of 18 specimens of 



E. marmotae 



(Question mark indicates undetermined number of setules) 



Legs: Leg I with two slender genualae and a microgenuala, 

 two tibialae and a microtibiala, a rather small spur with distal 

 microspur, a subterminala, a parasubterminala, and a pretarsala. 

 Leg II with a slender genuala, two slender tibialae, a rather small 

 spur with proximal microspur, and a pretarsala. Leg III with a 

 slender genuala. Nonspecialized leg setae v/ith relatively few, 

 straight setules. Punctae on coxae; fine punctae on distal seg- 

 ments not always visible. Claws and empodium long and strong. 



Scutum: Large. Anterior margin slightly convex between 

 anteromedian seta and posterolaterals. Lateral margins slightly 

 convex, diverging posteriorly. Posterior margin somewhat paral- 

 leling anterior margin, convex posterior to pseudostigmata and 

 concave between them. Posterolateral corners pointed, bearing 

 posterolateral setae. Setae large and strong with relatively few 

 setules, set close to margin. Pseudostig-mata slightly behind a 

 line drawn between the posterolaterals. Sensillae long, clavate, 

 widest in distal third, free end rounded or with a heavy pointed 

 setule; anterior surface well clothed vvath setules; setules few on 

 posterior surface; pedicel distinct. A long, slight ridge anterior 

 to each pseudostigma, beginning just anteromedial to the pseudo- 

 stigma and running laterally and anteriorly, curving posteriorly 

 near lateral margin; sometimes indistinct or absent. Punctae 

 scattered. Usually two small pits between each posterolateral seta 

 and the pseudostigma. 



Standard data of the type specimen from Jefferson County, Pa. : 



AW PW AP SB ASB PSB AL AM PL S 

 72 102 27 33 28 10 61 44 82 47 x 13 



