30 IXODOIDEA, OR TICKS, OF THE UNITED STATES. 



lar, posterior angles acute, the porose areas long, triangular, nearly 

 as long as broad; palpi with the second joint plainly a little longer 

 than the last, the latter about one and one-half times as long as broad. 

 Shield (PI. IV, fig. 2) elongate, fully one and one-half times as long 

 as broad, broadest near middle, broadly rounded behind, lateral carinse 

 distinct, but running out before the posterior third, surface minutely 

 punctate. Abdomen (engorged) very elongate, with very short 

 hairs, the anal grooves slightly approximating behind ; stigmal plate 

 (PL IV, fig. 2) transversely elliptical, its surface minutely granulate. 

 Legs short, tarsus I suddenly narrowing before tip, other tarsi taper- 

 ing to tip, tarsus I but little longer than metatarsus; coxse I with a 

 rather short, stout spine at base behind, and a tooth near apex, a 

 similar tooth on coxae II and III, coxse IV unarmed (see PL IV, 

 fig. 2). 



Length of female shield, 1 mm. 



Male. — The only one seen is very small ; elliptical ; the capitulum 

 subtriangular, the palpi extremely short, barely longer than width 

 of capitulum; the shield elliptical, about one and three-fourths times 

 as long as broad, and but little broader in middle. 



Length of male, 1.5 mm. 



The type is a female taken from Neotoma occidentalis at Shoshone 

 Falls, Idaho, collected by Dr. Cooper Curtice, and now in the col- 

 lection of the Bureau of Animal Industry, this Department. Other 

 specimens come from various rodents of the Northwest; Glacier 

 Bay, Alaska ; Portland, Oregon ; Massett, British Columbia ; Walker 

 Pass and Siskiyou County, California. In the Fourth Memoire of 

 his Revision Neumann gives a second description based on two speci- 

 mens from Argentina, of what he thinks is this species; it differs in 

 several points of structure, and evidently is not the same species, 

 since the many specimens of /. angustus examined by me agree closely 

 with the type. 



Ixodes sculptus Neumann. 



Female. — Shield yellow-brown; legs and palpi paler; abdomen 

 yellow-brown. Capitulum (PL IV, fig. 7) elongate-triangular, pos- 

 terior angles scarcely prominent ; porose areas large, much longer 

 than broad, and only about one-half their breadth apart, this space 

 containing an elongate depression or scar. Last joint of palpus one 

 and one-half times as long as broad, second joint plainly a little 

 longer. Shield (PL IV. fig. 7) one and one-fourth times as long as 

 broad, broadly rounded behind, lateral carintr strong, somewhat in- 

 curved, almost reaching the margin, the surface densely and very 

 minutely punctate. Abdomen punctate and with many longitudinal 

 rows of short yellowish hairs ; anal furrows subparallel ; stigmal plate 



