1905 



ENTOMOLOGICAL SOCIETY. 



127 



PHLOX MITE— TETEANYCHUS BIMACULATUS. 



By T. D. Jarvis, Ontario Agricultural College, Guelph. 



This species of mite, for several years past, lias caused injury to tlie cul- 

 tivated perennial Phlox on the College Campus. It answers to the de- 

 scription of the "Red Spider". The leaves become spotted above and the 

 under surface is coated with a fine loose web containing many minute par- 

 ticles. The small red oval mites may be seen with the naked eye and they 

 vary from a few to as many as fifty or more on the under surface of a single 

 leaf. (Fig. 68.) 



Length of mite .433 m.m. ; width .241 m.m. 



Length of front legs, .241 m.m. ; length of mandibles, .016. 



Length of cephalo-thorax, .040 m.m. ; length of hairs on legs, .100 

 m.m. 



The legs of the mites are slightly orange or yellowish in color and six 

 jointed. 



The mites hibernate on the lower leaves of the plant. Up to the 20th 

 of May the mite may be found feeding on the basal leaves of the plant. 



Fig. 68. "Red Spider," 

 greatly magnified. 



Fig. 69. Spruce Saw fly— greatly magnified. 



BLUE-SPRUCE SAW FLY— LYDA SP. 

 By T. D. Jarvis, Ontario Agricultural College, Guelph. 



Colorado Blue Spruce, Picea 

 It has not been found on any 



This Sawfly has caused injury to the 

 pungens, on the College Campus at Guelph. 

 other species of spruce on the Campus. 



The excrement of the larvae lies in masses on the leaves and branches, 

 and in some cases the tree becomes very unsightly. The larvse are found 

 in small colonies of from three to ten feeding beneath the masses of ex- 

 crement. They cut off the leaves and carry them to their retreat under the 

 excrement. 



The larvae (Fig. 70) are green and when full grown are 26 m.m. long 

 and the antennae 1^ m.m. long. The head and prothroax are black. The 



