. British insects : a familiar description of the form, structure, habits, and transformations of insects. Outline of Formica. ivays when at rest (whence the name AnrXoio, diploo, todouble; TTTepov, a tuing). The other two divisions areless easy to distinguish from each other, but the fol-lowing rules may be sufficient. Heterogyna consists ofthe Social Ants and of the Solitary Ants. The SocialAnts may be distinguished from the Sandwasps by theform of the footstalk by which the abdomen is attached tothe thorax^ and which forms, in some, one scale-likeprojection (fig. 53), or a knot-like lump; i
. British insects : a familiar description of the form, structure, habits, and transformations of insects. Outline of Formica. ivays when at rest (whence the name AnrXoio, diploo, todouble; TTTepov, a tuing). The other two divisions areless easy to distinguish from each other, but the fol-lowing rules may be sufficient. Heterogyna consists ofthe Social Ants and of the Solitary Ants. The SocialAnts may be distinguished from the Sandwasps by theform of the footstalk by which the abdomen is attached tothe thorax^ and which forms, in some, one scale-likeprojection (fig. 53), or a knot-like lump; in others(fig. 54), two such lumps or nodes. The Solitary Ants may be distinguished from theSandwasps by the female of the former being alwayswingless, while the male is generally toothed or spired atthe apex of the abdomen. When, therefore, an insect has been shown by the legsto belong to the subsection Pr^dones, and by its non- HYMENOPTERA.—ACULEATA. 189 folding wings to belong to one of the two first divisionsin that subsection, its place will be further ascertained Fig. Profile of Myrmica. thus. It belongs to the first division, Heterogyna, if,whether wingless or winged, the abdomen be furnishedwith the scales or nodes (social ants); also if it be wing-less ( 9 of social ants sometimes, of solitary always) ; alsoif it be winged and spicate at the tip of the abdomen ( $of solitary ants only). Otherwise the insect belongs tothe Sandwasps or Fossores. Division I. — Heterogyna. — The Ants.—Very dif-ferent opinions are entertained as to this division Hetero-gyna. The word, signifying inpog, heteros, different;rvvi7, gyne, a woman, is by some considered to excludethe mutillidcE or solitary ants, in which the sexes consistonly of the perfect male and female. The female here,however, differs from most perfect insects in beingakvays wingless, in this approaching the neuters of thesocial ants. In adopting the present arrangement, thewriter follows Mr. F. Smith, of the Bri
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Keywords: ., bookauthorme, bookcentury1800, bookdecade1870, booksubjectinsects
