TYKOGLYPHUS LINTNERI OSBORN. 15 



entire body, behind toward tip are six pairs of bristles, most of them 

 fully as long as entire body; all these bristles of bod}^ are seen to be 

 hairy (PI. V. fig. 4:4): the cephalic bristles show these hairs more dis- 

 tinctly toward tip. The basal joints of the legs are of the usual 

 length, but the tarsi are extremely slender; tarsus 1 (PI. V, tig. -W) 

 is about as long as the three preceding joints together, while tarsus IV 

 (PI. V, lig. 4-i) is about as long as the rest of the leg; the bristles on 

 legs are about as usual, tine and slender, but that at the tip of the 

 penultimate joint of leg IV is scarcely half as long as the tarsus ; the 

 hair near tip of tarsus is rather short on all legs. 



Length, O.ttO to 0.60 mm. 



This species is readily known by the hairy bristles of body and by 

 its extremely long tarsi. It has been received only a few times, but 

 usualh' in great abundance and usually attended with some predaceous 

 mites — Cheijletus or Gamasus. Specimens have been examined from 

 grain in mill at Milwaukee, Wis.; fromWinheld, Ontario, Canada, in 

 house and barn in great numbers, and Doctor Oudemans writes me 

 that he has seen it from California. 

 Tyroglyphus lintneri Osborn. (PI. Ill, fig. 29.) 



Cephalothorax with four long, subequal bristles in a slightl}" curved 

 transverse row; a pair on front margin, longer than the mandibles; 

 two long humeral bristles and a short one close by; two pairs of sub- 

 median bristles on the dorsum of aV)domen, the anterior pair about 

 one-half the length of the abdomen, the posterior pair as long as abdo- 

 men; and six each side near tip, all very long except the inner one, 

 which is scarcely as long as abdomen, and a short pair on venter near 

 the anus. The legs have the usual bristles, the long one at end of 

 penultimate joint is plainly longer than the tarsi in all the legs; the 

 hind tarsi (PI. Ill, fig. 24) are full}- as long as the two preceding- 

 joints together; there is a curved plumose bristle above on the third 

 joint of legs I and II. (Male genitalia, see PL III, fig. 25.) 



Length, 0.30 to 0.38 mm. 



This mite is very similar in all respects to the T. americanu^, but 

 the bristles of abdomen are longer and somewhat differentl}" arranged. 

 In the male the tubercle-like suckers on hind tarsi (PI. Ill, fig. 24) are 

 farther apart than in T. americmius; in the female the vulva (PI. Ill, 

 fig. 23) shows a broader emargination behind than in that species. 

 These differences, associated with the different habitat, demand some 

 recognition in nomenclature; therefore I consider the mushroom mite 

 as a distinct species. It differs at once from T. longior in the simple 

 bristles of the body. 



This species has been received from Freehold, N. J.; Hazelton and 

 West Chester, Pa. ; and from York Corner, Me. It does enormous 

 damage to mushrooms, but appears to be a native species. Lintner 

 records it from Jamesport, Suffolk Countv, N. Y. 

 8040—06 3 



