188 PROCEEDINGS OP THE NATIONAL MUSEUM vOL. 106 



species of Marmota. The nature of these correlations is yet to be 

 determined. 



18. Euschiingastia hamiltoni Brennan 



Figure 7,a; Plates 6, 17 



Euschongastia hamiltoni Brennan, 1947, pp. 251-252, fig. 4A-D. — Fuller, 1952, 

 pp. 182, 184. 



Description: Size: Engorged length, 560 to 740; width, 350 

 to 390. 



Shape : Long oval. 



Color: Pale yellow (Brennan, 1947). 



Gnathosoma: Seta on palpal femur long, curved, with long 

 setules set well apart in about three alternate rows on the outer 

 curvature. Seta on genu shorter, with long setules spaced in about 

 two alternate rows. Dorsal seta on palpal tibia arched anteriorly 

 with a few long setules on the convex curvature; lateral seta 

 usually nude, one on one specimen with three small setules ; ven- 

 tral seta rather short with setules spaced usually in two alternate 

 rows. Palpal claw long, curved; with five prongs, median prong 

 longest and heaviest, tvv'o somewhat shorter, and two smaller on 

 the convex curvature. Galeal seta with one to four setules. 

 Cheliceral base heavy, angulate posterolaterally ; blade smooth 

 with tiny subapical dorsal tooth and larger ventral tooth. Scat- 

 tered punctae on palpal coxa and cheliceral base. 



Legs : Leg I with two long, slender genualae and a rather long 

 microgenuala, two typical tibialae and a microtibiala, a long spur 

 with a microspur set almost the length of the spur distally, a 

 subterminala, a parasubterminala, and a pretarsala. Leg II with 

 a long, slender genuala, two tibialae, a rather slender spur with 

 microspur just proximal to it, and a pretarsala. Leg III with a 

 long, slender genuala. Nonspecialized setae with relatively few 

 setules, some straight, others curving to form an open frill. 

 Scattered punctae on all coxae, also on all other leg segments of 

 some specimens. 



Scutum: Somewhat rectangular in general outline. Anterior 

 margin generally concave with a slight convexity at the anterior 

 median seta. Lateral margins slightly concave, diverge posteri- 

 orly. Posterior margin generally parallels the anterior margin, 

 slightly convex posterolateral to the pseudostigmata and slightly 

 concave between them. The anterolateral and the posterolateral 

 setae are on the slightly extended corners; anteromedian set 

 close to margin. Setae with relatively few setules. Anterolateral 



