1911] Ewing — Predaceoiis and Parasitic Acarina 41 



From Chionaspis sp. on poplar. Specimens collected by the 

 writer at Ames, la., while engaged in studying the oyster shell 

 scale. 



Gen. Histiostoma Kramer. (Tyroglyphidae.) 

 Histiostoma phytopHaga sp. nov. 



Body granulate, greyish; legs flesh color. Cephalothorax as broad as long. 

 Mandibles sharp, tapering; teeth sharp and uniform. Palpi moderate; 

 anterior, lateral, hyaline projection tapering like a broad bristle, almost as 

 long as tarsus of leg I; posterior, lateral projection strongly recurved and not 

 more than half as long as the anterior. 



Abdomen two-thirds as broad as long, evenly rounded behind and with a 

 few, small, curved, simple bristles. 



Anterior legs extending beyond the tips of the palpi by about one-thii:d 

 their length; tarsus very much narrowed near its base and ending in a stout 

 claw, and a long seta which is equal to the segment itself in length. Near the 

 tip of tarsus I on its outer margin is a stout spine almost as long as the tarsal 

 claw; a very small bristle is on the lateral margin near its middle; on the inner 

 margin near the tip are two small spines, and also a small one near the middle 

 of the inner margin. Tibia of leg I as broad as long, and about one-third as 

 long as the tarsus. Posterior pair of legs slightly larger than the third pair 

 and reaching the tip of the abdomen. 



Length, 0.31 mm.; breadth, 0.20 mm. 



I found this species upon a very small plant in a little cell 

 containing earth where I was rearing one of the common "Red 

 Spiders." Described from two specimens. 



Gen. Alloptes Canestrini. (Analgesidse.) 

 AUoptes longipes sp. nov. (PI. 7, fig. 3). 



Integument well chitinized; posterior group of legs in the case of the adult 

 males more strongly chitinized than the body. 



Adult Male. Beak small, inconspicuous, reaching to about the middle of 

 the third segment of leg I. 



Body broadest in front of the third pair of legs then becoming rapidly 

 narrowed until the tip is reached. Epimera of first pair of legs fused together 

 at the median line; those of the second and third legs united into a Y on each 

 side of the body. The bases of the two Y's thus formed are united to a medial 

 strip which joins them to the epimera of the fourth pair of legs. From the 

 posterior margin of the abdomen extends a long pair of bristles equal to the 

 entire length of the body of the mite. Each of these bristles has an enormous 

 swollen region near its middle. 



Legs of the anterior group subequal; the anterior pair a little over twice as 

 long as the beak. Legs of the posterior group very large, fourth pair exceeding 

 the third considerably and reaching beyond the tip of the abdomen by about 



