. Economic entomology . Tetranychus? (Leptus) Americanus Copied from Mr. Riley s fiLfure. Tetranychus? AMERICANUS, young (Lep- tus americanus, Riley, Sixth Ann. Rep. Missouri, 52).—21. Magnified sketch of ditto, copied from Mr. Riley's woodcut. Mr. Riley states that this species is found along with Leptus irritans in North America, and that both are there called Jiggers, or harvest mites. They are red like their congeners. Our information regarding both is insufficient to enable us to fix their place. No, 22. Tetranychus? irritans, young (Leptus irritans, Riley, loc. cit. supra).— 23. Magnifie
. Economic entomology . Tetranychus? (Leptus) Americanus Copied from Mr. Riley s fiLfure. Tetranychus? AMERICANUS, young (Lep- tus americanus, Riley, Sixth Ann. Rep. Missouri, 52).—21. Magnified sketch of ditto, copied from Mr. Riley's woodcut. Mr. Riley states that this species is found along with Leptus irritans in North America, and that both are there called Jiggers, or harvest mites. They are red like their congeners. Our information regarding both is insufficient to enable us to fix their place. No, 22. Tetranychus? irritans, young (Leptus irritans, Riley, loc. cit. supra).— 23. Magnified sketch of ditto, copied from Mr. Riley's woodcut. This is the Jigger of the Mis- sissippi valleys, where it is ex- ceedingly irritating—whence its name. It acts as one of the representatives in that country of our Tetranychus (Leptus) au- tumnalis; but until the perfect insect is known its place must Trombidium (Leptus), irritans. Copied from Mr. Kp^ /^nr»iAofiircil Riley's figure. ^^
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