16 A REVISION OF THE TYROGLYPHID^. 



Tyroglyphus americanus ii. ^p. (PI. Ill, tig. 20). 



Cephalothorax with four long, line, equal bristles in a slightly 

 curved transverse row, a pair of shorter bristles on front margin; 

 two long humeral bristles, longer than width of body, a pair of sub- 

 median bristles each side on the dorsum, the anterior rather short, the 

 posterior very long, as long as abdomen; on posterior margin and 

 near the tip are six bristles each side, five of them about as long as 

 abdomen, the other much shorter and near the median line. Legs of 

 moderate length, like figures of T. siro, but the tarsi (PI. Ill, fig. 22) 

 are more elongate and slender then in Michael's figure of that species; 

 the usual bristles are present, none spine-like; that at tip of penulti- 

 mate joints is very long; there is a curved plumose bristle above on 

 the third joint of legs I and II; the hair at tip of tarsus is not one- 

 half the length of the joint; in the male the sucker-like tubercles on 

 tarsus IV are but little more than their diameter apart. (Genitalia, 

 PI. Ill, fig. 21.) 



Length 0.27 to 0.30 mm. 



This species is close to Michael's identification of T. siro^ but has 

 much longer bristles and longer tarsi; indeed the hind tarsi are as long- 

 as the two preceding joints together; however, it can not be T. longior^ 

 since the bristles are not serrate. It may be that some European 

 writers have mixt this species with T. longioi\ but I regard Michael's 

 identification of T. longior as correct, that is, a mite with long serrate 

 bristles, and the same as the form I regard as T. longior in this paper. 



There are many specimens of this species in the collection of the 

 Department of Agriculture, as follows: Washington, D. C, on rotten 

 plums; Paola, Kans., in flaxseed; Minneapolis, Minn., in wheat; 

 Savannah, Ga. , in rice; College Station, Tex., in cotton seed; Racine, 

 Wis., in flax mill, and on decaj'ing orange at Washington, D. C. 



Many of the references to T. siro and T. longior in our economic 

 literature doubtless refer to this species. 



Tyroglyphus cocciphilus n. sp. 



Cephalothorax with four long bristles in a transverse row, the mid- 

 dle pair plainly longer than the outer pair, yet the latter is as long as 

 width of body; a short pair on the front margin, longer than the mandi- 

 bles; two pairs on dorsum, the basal pair about one-half the length of 

 body, the posterior pair about as long as entire body; two long humeral 

 bristles each side and a short one near by; behind and near tip are 12 

 bristles, 3 on each posterior side and 3 each side near tip in a vertical 

 or longitudinal line, all about as long as abdomen or a little longer; a 

 short pair below near anus. Legs of moderate length, with the usual 

 bristles, none spine-like; the tarsus (PI. IV, fig. 35) about as long as 

 two preceding joints together in all the legs, the bristle at tip of 



