. Ants; their structure, development and behavior. aleor female larvae or pupae of the Tetrainorhini may be quickly passedover and attention concentrated on the nests in which these are absent.\Yasmann has shown that testaceus is more resistant to unfavorableconditions than its host. This suggests the feasibility of introducingit into America, where T. cespitum has become thoroughly acclimatedand rather abundant, especially in some parts of the Atlantic States. II. Harpagoxenus (Tonwgnatluts).—The two known species ofthis genus are rare and very local ants, allied to , the genusto
. Ants; their structure, development and behavior. aleor female larvae or pupae of the Tetrainorhini may be quickly passedover and attention concentrated on the nests in which these are absent.\Yasmann has shown that testaceus is more resistant to unfavorableconditions than its host. This suggests the feasibility of introducingit into America, where T. cespitum has become thoroughly acclimatedand rather abundant, especially in some parts of the Atlantic States. II. Harpagoxenus (Tonwgnatluts).—The two known species ofthis genus are rare and very local ants, allied to , the genusto which their hosts belong. The workers are small, dark-brown, withshort legs and hairy bodies and are easily recognizable by their broad,toothless mandibles and their peculiarly elongated frontal carinae, whichextend back to the vertex and there bend outward, forming scrobe-likedepressions for the short antennae. i. Harpagoxenus sublevis (Fig. 274).—The habits of this ant have-been studied by Adlerz (1886, 1896) and Yiehmeyer ( 1906, 1908). It. FIG. 274. sublcris. (Adlerz.) a. Male; b, ergatoid female. was formerly supposed to be confined to boreal Europe, having beendiscovered in Finland by Nylander (1848) and taken in Denmark byMeinert (1860), and in Sweden by Stolpe (1882) and Adlerz (1886,1887. 1896), but Viehmeyer has recently shown that it also inhabitsthe heaths near Dresden. In the locality last mentioned it is alwaysfound in the nests of Leptothorax acerzornm, and although this is itscommon host in northern Europe, Alderz has observed it also in the THE DEGENERATE SLATE-MAKERS. 493 nests of L. musconiin and L. tuberuin. The mixed colonies may con-tain males and females as well as workers of both the host and parasitic-species. The males of sublevis are so much like those of Leptothoraxthat Adlerz failed to distinguish them till he published his final paper(1896). All the females which he found were wingless and ergatoid,with a thorax like that of th
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectants, bookyear1910
