NO. 1382. 



THE A CARINA OR MITES— BAXKS. 



65 



Fig. 121. — PllTlUR.i CARL'S 

 SP., CLOSED VP; VENTP..\I, 

 VIEW. 



are arranged in a somewhat radiate manner, and the hind pairs are never 

 remote from the anterior pairs. Each leg- is composed of six joints, 

 namely, coxa, trochanter, femur, patella, tibia, and tarsus. Sometimes 

 there is a plate-like expansion near ])ase of coxw, known as a tcctopedium. 

 The coxa? are usually entirely united to the ventral surface of the body 

 to form a sternal, or, more properly, a coxal plate, each coxa usually 

 being- margined by a short furrow. In JVot/m/s, 

 however, the coxa? may ])e seen to be quite dis- 

 tinct from the body. On the first two pairs of 

 legs the trochanter is extremeh' small and usu- 

 ally indistinct, while this joint is often very large 

 on the hind pairs. So it follows that the hind 

 legs have, apparently, one more joint than the 



front })airs. The tar- 

 sus is terminated by 



one or three claws, 



but without a sucker 



or pul villus. The 



legs 1)ear a few hairs, 



l^ut never many; one 



at the tip of the tibia is often nmch longer 



than the others. The tarsus is commonly 



more hairy than the other joints. 



On the dorsum of the cephalothorax 



there are often narrow ridges or lamella?; 



the position, shape and development of 



these being 



-GALr.MN.\ SP., FRO.M EEL<iW. . . ,, 



characteristic ot 

 each species. Generally there is an erect 

 lamella each side, extending in a point (some- 

 times bitid) in front of the cephalothorax. 

 Frequently there is a trans-lamella < onnect- 

 ing the lateral lamella?. There are also on 

 the cephalothorax usually two pairs of bris- 

 tles, the pair near and l)etween the pseudo- 

 stigmata are the superior l)ristles; the pair 

 toward the tip and often at ends of the 

 lamelhe are the inferior bristles. There is 

 also a pair of smaller l)ristles at the apex of ^'"- 1'^-^'"'''" o^ -^ gai.,mna. 

 the cephalothorax. Around the sides of the abdomen there is a line 

 separating the dorsum from the venter. In the Iloplodermida' this 

 line is often far down on the under side of the l)ody. The dorsum 

 of the al)domen is often devoid of hairs, but sometimes there are a 

 few, usually arranged in rows. On the venter are two openings, the 

 basal the genital one as usual. These openings are circular, elliptical, 

 or rhomboidal, and are closed by folding doors opening outward, 

 Proc. N. M. vol. xxviii— 04— 5 



Fig. 122 



