80 



HARVEST-BUGS. 



occur on the abdominal viscera, in the muscles and beneath 

 the skin. 



C. HARVEST-BUGS. JIGGERS. 



{Troinhiduda'). 



These mites are soft, bright-colored, and more or less 

 hairy. They possess a conical sucker composed of two 



Fig. 45. — Tromhidiiim locustnrum; a, female laying eggs; b, young larva; c, 

 fresh egg; (/, rl, egg shells. Enlarged. After Kilej-. 



hooked or styliform chelifers hidden in a tube formed by the 

 lower lip and the joined maxillae. The palpi are usually 

 large, the second joint is longest, while the last bears a pe- 

 culiar appendage which can be used as a finger and thumb. 

 The eight legs have five orsixjoints, usually with two hooks. 

 Tw^o eyes are often present. The six-leg- 

 ged larvae lead a parasitic life, and not 

 alone upon insects and spiders, but also 

 upon warm-blooded animals, which they 

 torment, and where they can produce 

 itch-like sores. Thelarvse of some of the 

 species of Troinh/dlvm are, however, ex- 

 ceedingly beneficial; for instance the 

 young of the locust-mite check most 

 effectually the increase of the Rocky-mountain locust. An- 

 other small and red mite is frequently found upon our com- 

 mon house-fly, where it becomes the torment of our tor- 

 menter. May it prosper! In figure 45 is shown a female 

 Troinhidium laying eggs, and a young larva; in fig. 46, 



Fig. 47. — Mite from 

 house-fly. Enlarged. 

 Original. 



