96 



THE EEPOKT OF THE 



No. 36 



Eliyncliolophus parvus, Banks. Under leaves in woods. T. D. J., Guelph. 

 RhzjnchoJophus sp. Feeding on San Jose Scale. T. D. J., Guelph. 

 Rhyncholophus sp. Feeding on New York Plum scale. T. D. J., Guelph. 



Family Teombidiidae. 



Although only three species have been studied, one of them, Microtromhidum 

 locustarum, is of great importance, as it is parasitic upon the eggs and adults 

 of locusts. The "Harvest mites," as they are popularly called, are recognized by 



Fig. 24. Trombidium locustarum. — (a) mature larva, when about to leave the wing of a locust ; 



(b) pupa ; ((•) male adult fresh from the pupa ; {d) female — the natural sizes are indicated 



by the short lines on the right ; (e) palpal claw and thumb ; (/) pedal claws ; (g) a 



barbed hair ; (A) the striations on larval skin (after Riley). 



Fig. 25. Trombidium locustarum. — (a) female with her batch 

 of eggs ; (6) newly-hatched larva — natural size shown by I ^ 

 the dot in a circle.on the right ; (c) egg ; (d, e) emptVj 

 egg-shells (after Riley). 



,FlG. 26. Dermanysus 

 avium. 



the body being divided into two parts, the anterior the smaller and the posterior 

 the larger. (Fig. 23). They are always red in colour and most of them quite 

 large. The body is covered with a coijipact mass of bristles or branched hairs 

 which gives tliem a velvet-like appearance. 



Trombidium scrioeuni. Say. On decayed log; cedar moss. T. D. J., Guelph. 



Microtromhidium locustarum, Say. (Figs. 24 and 25). Parasitic on several 

 species of locust in all parts of Ontario. T. D. J., Guelph. 



Tromhidium sp. On eggs of Forest Tent Caterpillar. 



