662 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.59. 



importance, as is indicated in the following key to three forms of 

 Bryobia: 



a. 1 Mandibular plate emarginate in front; cephalothoracic plate much broader than 

 long. 



b. 1 Inner tubercles of cephalothoracic plate, as seen in egg-bearing females, united 

 for about half their length, and bearing squamous setae almost as large as 



those of the outer tubercles B. praetiosa Koch. 



b. 2 Inner tubercles, as seen in adult females, united for at least three-fourths their 

 length, and tipped with squamous setae much smaller than those of the 

 outer tubercles, cephalothoracic plate less than one-third as long as cephalo- 



thorax B. brevicornis, new species. 



a. 2 Mandibular plate not emarginate in front; cephalothoracic plate, as seen in egg- 

 bearing females, about as long from base to tips of inner tubercles as it is broad, 

 and fully equal in length to one-half the length of cephalothorax 



B. longicornis, new species, 



Descriptions of these two new Bryobias are here given: 



BRYOBIA BREVICORNIS, new species. 



Plate 125, fig. 3. 



Adults brownish red and similar in markings to B. praetiosa. 

 Body about three-fourths as broad as long. Cephalothorax over twice 

 as broad as long; two eyes on each side above second pair of legs, both 

 with cornea; anterior eye about three-fourths the diameter of posterior 

 one. Cephalothoracic plate showing much variation, but always, 

 in the case of egg-bearing females, much broader than long; inner 

 tubercles projecting much in front of lateral ones, united from three- 

 fourths to their entire length, and bearing scales decidedly smaller 

 than those on outer tubercles. Mandibular plate about twice as long 

 as broad and conspicuously notched. Abdomen widest somewhat 

 behind the shoulder region and evenly rounded behind. Front legs 

 equal to the body in length; tarsi provided with two claws (onychial 

 claws) , each bearing a pair of tenent hairs, which arise from near the 

 base; and a few hair-like elements, which spring from below the bases 

 of claws. Tarsi of the other legs without tenent hairs and with the 

 hair-like elements below the claws developed into a comb. Length 

 of adult females, 0.69 mm.; width, 0.52 mm. 



Type locality. — Tempe, Arizona. 



Type slide.— Cat. No. 23756, U.S.N.M. 



Described from egg-bearing females on type slide. Three other 

 slides are also in the Museum collection. The specimens were col- 

 lected by Wildermuth from alfalfa. 



BRYOBIA LONGICORNIS, new species. 



Plate 125, fig. 4. 



In general appearance similar to praestiosa and brevicornis, but 

 somewhat larger. Cephalothorax over twice as broad as long; two 

 eyes on each side, the larger posterior pair either without cornea, or 



