PROCEEDINGS OF THE NATIONAL, MUSEUM. 



VOL. 63. 



PROTOGYROPUS NORMALIS, new species. 



Plate 1, fig. 1, and text figs. 2 and 3. 



A medium-sized, rather poorly chitinized species. Head moderate, 

 subtriangular ; temporal lobes not projecting; antennal fossae fully 

 one-half as long as head. Antennae rather short. Palpi (fig. 2) 

 almost half as long as antennae; first segment ringlike and much 

 broader than long, second segment equal to first in length but not 

 so broad, distal segment slightly longer than two but only two-thirds 

 as broad. Dorsally the head is sparsely clothed with setae including 

 a posterior, transverse row of six long ones and two long setae on 

 each temporal angle. Prothorax about three-fourths as broad as head 

 and broadest near its anterior margin. Mesothorax more or less fused 

 with metothorax, broader than prothorax and about twice as broad 

 as long. Metathorax 'the broadest and largest thoracic segment, 



clothed above l)y a few 

 setae which are mostly 

 a continuation of the 

 four lon^tudinal rows 

 of the abdomen. Ab- 

 domen oval, broadest at 

 the region of the fourth 

 segment. Dorsally the 

 abdomen bears four lon- 

 gitudinal rows of mod- 

 erate setae, usually there 

 being in each row three 

 setae to a segment, these 

 three setae increasing in 

 length from before backward. The last two abdominal segments each 

 bear a pair of large lateral setae. Legs moderate and similar, the 

 first pair being smaller than the other two pairs. Tarsus I similar 

 to the others, first segment rather indistinctly divided from the 

 second which is longer and narrower than the first, claw slightly 

 longer than segment two. 

 Length, 1.02 mm.; width, 0.52 mm. 



Type host and type locality. — Host Cavia., species (U.S.N.M. 

 236337: Biol. Surv. Collection) from Gen. Roca, Rio Negro, Ar- 

 gentina. 



Type slide.— Cat No. 23747, U.S.N.M. 



Described from the following material: Three females from a 

 skin of a female Oavia, species, (Cat. No. 236337 U.S.N.M.: Biol. 

 Surv. Collection) taken November 23, 1920, at Gen. Roca, Rio Negro, 

 Argentina, bj'^ A. Wetmore ; two females from skin of female Cavia, 

 species (Cat. No. 23640, U.S.N.M.: Biol. Surv. Collection) taken 



Fig. 2. — To left, palpus of Protogyropus normalis ; 



TO RIGHT, PALPDS OF HETEROGYROPUS HETERONY- 

 CIIUS. 



