. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. Fig. 224.—Pigmeopfiorus amcricanus, from below. (Author's illustration.) Fig. 225.—Scutacarus amcricanus, from below, and claw. (Author's illustration.) and Grassi has but three pairs of legs; the female on hatching is similar to the male figured (fig. 222), but has a long bristle at the tip of the body. After pairing she molts, becomes tumid, and loses her legs, but retains a pair of clawlike processes in front by which she holds to the host insect. They occur under the elytra of tenebrionid beetles in
. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. Fig. 224.—Pigmeopfiorus amcricanus, from below. (Author's illustration.) Fig. 225.—Scutacarus amcricanus, from below, and claw. (Author's illustration.) and Grassi has but three pairs of legs; the female on hatching is similar to the male figured (fig. 222), but has a long bristle at the tip of the body. After pairing she molts, becomes tumid, and loses her legs, but retains a pair of clawlike processes in front by which she holds to the host insect. They occur under the elytra of tenebrionid beetles in South Europe and Africa. Tragardh redescribed the genus under the name of Pimelohia. In the Tarsoneminae there are also two very distinct genera: 1. Body broad, nearly circular, hiding the mouth parts and greater part of legs Scutacarus. Body elongate, mouth parts terminal; hind legs in male thickened, in female with two terminal hairs Tarsonemus. The species of Tarsonemus (fig. 221) affect various plants, sometimes producing galls upon them. They live in colonies upon the leaf or stem at the base of flowers, or in the culms of grasses. One species, T. oryzx Canestrini, in- fests rice in Italy; another, T. culmicola Reuter, produces ?'silver top'' in certain grasses of Finland; a similar form produces the same appearance in some gi'asses of Xew Mex- ico. One grass stem may contain several million mites. Another species ( T. pellucens Green) does considerable dam- age to tea in Ceylon. Tryon has described a species, T. anasae Trj^on, as injuring pineapples in Australia. I have described one, T. latus Banks (figs. 219, 220), which causes galls on the main shoots of mango plants. Another species, T. pallidus Banks (fig. 218), has been found on various green- house plants in this country and sometimes causes great damage to the flowers. Michael has recorded a species, T. bancrofti Michael, as the cause of serious damage to sugar cane in Queensland. T. canestrinii ^Marchal prod
Size: 1422px × 1757px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashi, bookyear1915
