. Ants; their structure, development and behavior. tydids), and because theirstructure would seem tobe adapted to respond-ing like the chords of amusical instrument todelicate vibrations. Tnants the development ofthese sense-organs isgreatly inferior to thatof the Orthoptera justmentioned, but they arenevertheless very easilyseen when one knowsexactly where to lookfor them. They werefirst detected by Lub-bock (1877) in theproximal portion of thefore tibia? of Lasiusflavus, Mynnica ingi-nodis and Pheidolc me-gacephala. He pointedout their resemblance tothe subgenual chordo-tonal organs of Ortho
. Ants; their structure, development and behavior. tydids), and because theirstructure would seem tobe adapted to respond-ing like the chords of amusical instrument todelicate vibrations. Tnants the development ofthese sense-organs isgreatly inferior to thatof the Orthoptera justmentioned, but they arenevertheless very easilyseen when one knowsexactly where to lookfor them. They werefirst detected by Lub-bock (1877) in theproximal portion of thefore tibia? of Lasiusflavus, Mynnica ingi-nodis and Pheidolc me-gacephala. He pointedout their resemblance tothe subgenual chordo-tonal organs of Orthop-tera, discovered by vonSiebold in 1844, but al-though he fancied he could discern some of their minute structure,his account and figure are very primitive. The matter was re-investi-gated by Graber (1882), who found the organs in Solenopsis, Myrme-cina and Tetramorium, and showed that they occur not only in thefore but also in the middle and hind tibiae, that they contain scolopalbodies and are also in other respects typical chordotonal FIG. 33. Chordotonal organs in tibiae of Myrmicarubra worker. (Janet.) A, Longitudinal section offore tibia ; B, cross-section of same ; C, cross-sectionof middle tibia ; D, cross-section of hind tibia; organ ; b, internal fossa; c, small; trachea ; e, nerve ; /. muscle; g. septum ; h,scolopal bodies ; i, ganglion cells ; k, distal nuclei. 64 . ixrs. Janet ( 1904) has recently studied their structure with great care,and has not only added many details to those seen bv his pre-dece»»>rs, but has al> discovered a number of less conspicuouschordotonal organs in other parts of the ants body. He finds apair in the head at the base of the antennae (Fig. 27, achot, onein the prosternum. just under the prothoracic ganglion (clw). withwhich it is connected by short nerves, a similar pair in the metasternnmand two pairs, one in the petiole and another in the postpetiole, whichlie near the tracheal stigmata and are
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectants, bookyear1910
