March, 1904.] BaNKS : NeW SpECIES OF INJURIOUS MiTES. 55 



much as the " rust-mite." I have not seen the mites alive, so can- 

 not say whether they live in colonies or not. The genus differs from 

 other Tetranychidse in the slender palpi, the furrows across base of 

 abdomen and the short, thick legs. The species is described as follows : 



Tenuipalpus calif ornicus, new species. (Plate II, Fig. 2.) 



Body broad ; broadest in front across cephalothorax, tapering behind, but broadly 

 rounded at tip. The side-margins of the cephalothorax, and the base of abdomen 

 is deeply crenulate. The abdomen shows several transverse furrows on the basal 

 part. There is a hair on the outer side of the cephalothorax, and three each side 

 near the tip of the abdomen. The legs are short, and their margins more or less 

 crenulate. They have but few hairs, and these on the basal joints. The venter of 

 the female shows two smooth areas in the posterior part surrounded by furrows ; the 

 first is one and one half times as broad as long, the other just behind it is semicircu- 

 lar. The male is much more slender, although but little longer than the female. 

 The latter with eggs is rather longer and with a more tapering abdomen ; the eggs 

 are elongate and red in color. 



Length 0.2 mm. 



On orange peel, Redlands, Cal. (Pease). In one of the lots sent 

 were several Gamasid mites, evidently predaceous upon the Tenuipalpus. 



Genus TARSONEMUS Can., 1876. 



In the greenhouses of the U. S. Department of Agriculture there 

 have been a number of small mango plants. Some of these stopped 

 growing when about 12 to 18 inches high. The tip of the shoot was 

 thickened and partly discolored. Investigation showed that they were 

 infested with a new species of Tarsonemus. The mites occur on the 

 surface of the swelling in considerable numbers, and their feeding 

 seems to cause a stoppage of growth, and enlargement of the affected 

 part — a gall, although without cavity. 



Tarsonemus latus, new species. (Plate II, Fig. 3.) 



Body ( 9 1 broadly elliptical ; beak short and broad. Legs I and II subequal, 

 scarce half the length of body, with a few hairs toward tips ; leg III longer than II, 

 and more slender; leg IV still more slender and ending in two hairs, one much 

 longer than the other. Body of male very broad, broader than long; beak conical. 

 Leg I small; II larger; III longer than II, but more slender, IV very large and 

 thick, the femur swollen on outside, a spinous process near tip of tibia on inner side, 

 and a long hair from outside of tarsus near tip. Between the hind legs the abdomen 

 ends in a broad, emarginate lobe, with a long bristle from each outer corner. 

 Length 0.5 mm. 



On young shoots of mango (in greenhouses) Washington, D. C. 



