PARKER: NEW EXCLAXD SARroi'II AMIDAE. 15 
extremity of the preceding segment. Distally ;it Itoth sides, each of 
the four proximal sejiments I)ears a short, hut stout, conspicuous spine, 
l)ut on the first and second segments of the metathoracic tarsus the 
posterior spine is weakly developed and sometimes almast concealed 
beneath a prominent mat of reflecting hairs that \ary in color with 
each change of hght. A similar hut less prominent mat occurs in the 
first segment of the prothoracic tarsus hut is more anterior than 
posterior in position. Excepting these three surfaces just mentioned, 
the anterior and posterior edges or surfaces of each of the first f<jur 
segments hear a row of short bristles that extend proximally from the 
distal spine. Ventrally on each of these segments (i. c, the first four) 
a narrow hand down the center is marked off by two rows of short 
bristles. Usually on segments 2, 3, and 4 of the anterior and middle 
tarsi, and on 2 and 3 of the posterior tarsus this hand is covered with 
dense yellowish or orange-yellow hairs, the color changing somewhat 
with the direction of the light. The.se I call reflecting bands (PI. 2, 
fig. 17, rh.). On segments proximal to those on which the l)and is 
completely covered with hairs, the latter usually are present at the 
distal end only. The fifth or terminal segment bears at its ex- 
tremity the claws (PI. 4, fig. 2S), pulvilli (pi\), and empodium (cm.). 
The hair-like empodium is borne on a small, suhciuadrate plate, and 
is equal in length to the flap-like pulvilli. Each outer corner of the 
subquadrate plate bears a process which articulates with the l)aso of 
the corresponding pulvillus. The tarsi throughout and their appended 
structures except the empodium are covered with microscopic hairs. 
Abdomen. 
The somewhat conical abdomen consists of two distinct parts, an 
anterior and a posterior. These are sharply differentiated by color 
and structure. The posterior part is made up of several .segments 
highly specialized for purposes of reproduction, and will be considered 
imder a separate heading as the genital segments. 
The anterior portion, or abdomen proper, consists of five segments. 
The first of these is vestigial and can be seen from below only. The 
remaining four are normally developed, each possessing a notum and 
a sternum, and are visible both dorsally and ventrally. For accuracy 
in the anatomical description the abdomen is treated as consisting of 
five segments (a.s.i, as.i, etc.). In the systematic work, however, it 
will be considered to consist of onlv the four which are normallv 
