28 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxviii. 



In Tenu'ipalpm the pulpi are very small and slender, and end in two 

 or four short bristles. The species are smaller than Tetrani/cJiKs, and 

 red in color. I have seen one species from our country, namely. 



Ten Hi pal pan e(d!foru!c(i>i. It appears 

 to be very numerous on the oranges in 

 California, and dou])tless causes some 

 injury. Inasmuch as it is very small, 

 and does not breed very fast, it will 

 pro])ably never be a pest of prime im- 

 portance. It may be destroyed l)y the 

 treatment used against "red-spider." 



Tdnoiijcho'tdts is based upon one 

 species, T. califoTiilea^ which occurs 

 in small colonies on the leaves of orange. 

 Each colony is usually in a slight de- 

 pression, and is evident to the naked 

 eye as a snow-white patch, this appear- 

 ance being due to the fact that the 

 molted skins are retained attached to 

 the leaf. The mites, which are almost 

 colorless, and their Q^^>:^^ are located 

 among these molted skins. They do 

 not appear as yet to be numerous 



Fig. 38.— Neophyllobii's a.mericAiNUs. , • i i i 



enough to do any appreciable damage. 



Three other genera have been recorded in Europe, Eapalopsk^ 

 CryptognathuH^ and Tt'tranyelupHh^ each with but one or two species. 



Red-spider damage is conmion in nearl}- all foreign countries, Init 

 the generic positions of the mites that cause it are not easil}' discerni- 

 ble from the meager descriptions. In India and Ceylon one species, 

 called Tttraiiychus Jjiocuhd(i6\ is a verv serious pest to the tea plant. 



Eamily RHYNCHOLOPHID^E. 



.These common mites are similar in many ways to the harvest-mites 

 (Trombidiidiv) and by many authors have been united to them. They 

 are much like Tivmhhllum in appearance, but nearlv all are of more 

 slender proportions and more rapid in motion. The body is usually 

 divided, although not so plainly as in the Trombidiidie, into two parts. 

 The cephalothorax is quite large and on the same plane as the abdo- 

 men. Along the middle of the cephalothorax is a line or furrow, 

 known as the dorsal groove or crista. It is usually enlarged at the 

 posterior end, sometimes in the middle, and also at the anterior end, 

 where it often includes a frontal tubercle. There are one or two 

 simple eyes on each side of the cephalothorax; they are always sessile. 

 In one genus [Sinari^) there are also two eyes close together near the 

 middle of the; anterior margin. The palpi are prominent,, five-jointed, 

 the last forming a ''thumb" to the preceding, which ends in a claw. 



