March, 1904.] Banks : New Species of Injurious Mites. 53 



Cyphoderris monstrosa piperi, new variety. 



Distinguished from the typical monstrosa by the average greater size, rougher 

 and more opaque surface of the pronotum and by the color of the pronotum. In 

 structure like vionstrosa but different in general appearance. Pronotum more opaque 

 and mesially more profoundly incised dorsolaterally, in the male the posterior lobe 

 rising more rapidly posteriorly and the surface much more coarsely ridged longitudi- 

 nally than in the typical monstrosa and the deep black of the anterior lobe is less 

 glistening and is continued across the lateral lobes to the posterior border and 

 thence along the hind border across the top, leaving only the center of the pronotum 

 and the lower margin of the lateral lobes without infuscation. 



Length, male, 27 mm., female, 31 mm.; pronotum, male, 8.5 mm., female, 7 

 mm.; posterior femora, male, 12 mm., female, II mm.; wings beyond pronotum, 

 male, 8.5 mm., female, I mm. 



Type. — No. 7723, U. S. National Museum. 



The collector, in whose honor this interesting variety is named, 

 furnishes the following note on the habitat of the insect : 



"These specimens were collected in Paradise Valley on the south 

 side of Mt. Rainier, Washington, at the point called ' camp of the 

 clouds,' altitude about 6,000 feet. They were collected during the 

 daytime hidden under debris in a grove of alpine fir. No memoran- 

 dum was made concerning their notes." 



Class III, ARACHNIDA, 

 Order I, ACARINA, 



FOUR NEW SPECIES OF INJURIOUS MITES. 



By Nathan Banks, 

 Washington, D. C. 



(Plate II.) 



The following four new species of mites are all of considerable 

 economic importance. They have been received by the U. S. Depart- 

 ment of Agriculture, Division of Entomology during the past year. 

 The manuscript names of some of them have already appeared in print, 

 therefore it is useful to have the technical descriptions issued at an 

 early date. 



