SEVENTEENTH ANNUAL REPORT. 



408 



trally, the entire margin being more or less sharp; outUne oval; uniform deep reddish 

 brown, legs of lighter color. Tegu- 

 ment rough (shagreened), bearing 

 short, minute, barely visible hairs; 

 on both dorsal and ventral surface 

 there is a marginal row of quadran- 

 gular structures, each of which is 

 provided, more or less centrally, with 

 a very short, bristly hair, with a 

 broad base. Numerous glistening 

 pits, both dorsal and ventral, ar- 

 ranged more or less symmetrically 

 and usually in rows radiating from 

 the center. The most prominent are: 

 A semicircle each side of median line, 

 concavity median, on dorso-anterior 

 portion, the entire circle inclosing 

 a slight prominence dorsal of the 

 mouth, the two posterior pits being 

 rather large and oval ; postero-lateral 

 of this circle a more or less parallel 

 dorsal crescentic row; then two dor- 

 sal somewhat crescentic rows, con- 



FiG. 71. — Skin of Argas miniatus, showing ar- 

 rangement of the pits. Slightly symmetri- 

 cal because of pressure. Greatly enlarged. 

 Original. 



cavity posterior; a prominent dorso- 

 median and ventro-median row ex- 

 tending from the region of the anus 

 to posterior margin; on each side of 

 median line, both dorsally and ven- 

 trally, five or six alternately longer 

 and shorter rows radiating from 

 about the transverse anal plane to 

 the margins; two to three more or 

 less complete marginal rows, dorsally 

 and ventrally. Other smaller pits 

 distributed irregularly. The arrange- 

 ment of these pits is not absolutely 

 constant. Anus about in middle of 

 body, bordered with six to eight 

 short bristly hairs on each side. 

 Stigmatar lateral of coxae IV, cres- 

 centic, concavity posterior and 

 slightly median. Mouth, legs, and 

 genital pore on anterior half of body. 

 Four symmetrically arranged ventral 

 two of them near the base of palpi. 



Fig. 72.— Ventral view of same. 



hairs directed forward on base of capitulum, 

 Coxse contiguous, trochanters slightly broader than long; femur long, truncated 



