450 BUREAU OF ANIMAL INDUSTRY. 



the hypostome disposed in only three rows each side. Palpi extending beyond 

 hypostome by scarcely a third of the length of the third article; first article longer, 

 second and third shorter than in the female; dorsal retrograde point of second article 

 may be quite pronounced, especially on large specimens. Coxae increase in size from 

 I to IV, their median border parallel to median line of body ; coxae of right and left 

 sides are very close; coxae IV very large, at first twice afterwards (in the adult) three 

 times the size of the III pair, their median half greatly prolonged posteriorly, may 

 extend to the plane of the posterior extremity of the peritremes; prominences same 

 as in female. Two spines each on tarsi II to III; three spines on coxae IV; ventral 

 border of IV femur, tibia, and protarsus trispinate. 



Young female. — Body depressed, with oval contour, broader posteriorly than ante- 

 riorly, 5 mm. long by 2.5 mm. broad; color, reddish brown, except the dorsal shield; 

 capitulum, legs, and margin of superior surface somewhat lighter; scutum very large, 

 extending posteriorly to the niveau of the insertion of the III pair of legs, with 

 elliptical outline, slightly sinuous, with an anterior emargination limited by two 



blunt projecting angles; cervical grooves 

 concave laterally, transformed into deep 

 fossettes at their posterior extremity; two 

 kinds of punctations; some large, numerous 

 especially on the sides, the others very fine, 

 numerous on entire surface; color, milk 

 white, or in some live specimens silver 

 white, with iridescent rose to green, cover- 

 ing occasionally entire shield except the 

 grooves, the punctations and a median, 

 poorly limited, longitudinal spot, even ex- 

 tending over a part of the dorsal base of 

 the capitulum and the palpi; at other times 

 accentuated more on the borders, becom- 

 ing weaker as it elongates, and allowing 

 the deep brown red to appear. Eyes pale 

 brown, situated a little anterior of the mid- 

 dle of the lateral margin. Dorsal surface of 

 the abdomen with a marginal groove com- 

 mencing back of the eyes, and three lon- 

 FiG.177.-Stigmenof another specimen of Der- gitudinal grooves extending caudad to the 

 macentor reticulatus; female from Tennessee. marginal groove, the two laterals com- 

 Greatly enlarged, showing structure. Origi- niencing near the posterior border of the 

 nai. B. A. 1. Coll. 3206. scutum, the median some distance farther; 



some irregular wrinkles. Posterior margin, beginning at the stigmata, is divided into 

 eleven festoons; lateral festoons larger than the median. Punctations scattered in 

 irregular longitudinal series on the entire surface. These punctations are numerous, 

 of unequal size, and the largest bear short hairs; ventral surface also provided with 

 fine hairs; genital pore at height of coxae II; sexual grooves very close together in 

 their anterior portion, then diverging very sharply back of coxae IV and terminating 

 between the second and third anterior festoons of the posterior margin. Ano-mar- 

 ginal groove relatively short. Anus with very short hairs on its anterior border. Stig- 

 mal plate comma-shape, short, with truncated point, rounded. Capitulum 720 long 

 (from its posterior dorsal border to the extremity of the hypostome), each posterior 

 lateral angle prolonged into a short point; porose areas circular; mandibles 1.1 mm. 

 long, the digit measuring 150 ju- Internal apophysis of digit with large base and 

 strong posterior tooth; external apophysis with three successive teeth, one terminal, 

 a little subcentral, the second larger, the third still larger. Hypostome spatulate; 

 anterior denticles numerous and very small; proximal denticles very strong, on each 



