. Economic entomology. Beneficial insects; Insect pests; Thysanura. ii8 ARACHNOIDEA. CASE VIII. Nos. «3. 24. Bryobia speciosa {Koch)^ Ubers., 61. Genus Petrobia {Murr., ). Characters the same as those of Bry- obia, but with three eyes in the posterior angles of each side of the cephalothorax, and abdomen without triangular margi- nal papilla. Duges hesitated whether to place the species from which we have named this genus among the Tetranychi or Raphignathi. It appears to us to come so near Bryobia that it would not be well to place it apart from it, and yet too different to be put in the
. Economic entomology. Beneficial insects; Insect pests; Thysanura. ii8 ARACHNOIDEA. CASE VIII. Nos. «3. 24. Bryobia speciosa {Koch)^ Ubers., 61. Genus Petrobia {Murr., ). Characters the same as those of Bry- obia, but with three eyes in the posterior angles of each side of the cephalothorax, and abdomen without triangular margi- nal papilla. Duges hesitated whether to place the species from which we have named this genus among the Tetranychi or Raphignathi. It appears to us to come so near Bryobia that it would not be well to place it apart from it, and yet too different to be put in the same genus. We have therefore thought it better to make a separate genus for it. Petrobia lapidum {Koch). Trombidium lapidum {Rcrm., Apt. pi. vii.); Tetranychus cristatus {Diiges, Ann. Sc. Nat. 1834).—23. Magnified figure of larva. 24. Magnified figure of perfect yobia speciosa. Copied from figure in Kocli's Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Murray, Andrew, 1812-1878. [London] Chapman and Hall
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