. The Cambridge natural history. Zoology. 7 Fig. 67.—Pheidologeton labo- riosus, large and small workers. East India. worl-ers of flic genera Eciton and Aeiiictus of the suh-family Dori/lides have, like the Myrniicides, two nodes in the jJedicel.) This sub-family consists of about 1000 species, and includes a great variety of forms, but, as they are most of them of small size, they are less known than the Camponotides, and much less attention has been paid to their habits and intelligence. Forel, until re- cently, adopted four groups: Myrmicini, Attini, Pseudomyrmini and Cryptocerini; but he i
. The Cambridge natural history. Zoology. 7 Fig. 67.—Pheidologeton labo- riosus, large and small workers. East India. worl-ers of flic genera Eciton and Aeiiictus of the suh-family Dori/lides have, like the Myrniicides, two nodes in the jJedicel.) This sub-family consists of about 1000 species, and includes a great variety of forms, but, as they are most of them of small size, they are less known than the Camponotides, and much less attention has been paid to their habits and intelligence. Forel, until re- cently, adopted four groups: Myrmicini, Attini, Pseudomyrmini and Cryptocerini; but he is now disposed to increase this number to eight.^ They are distinguished by differences in the clypeus, and in the form of the head; but it must be noted that the characters by which the groups are defined are not in all cases fully applicable to the males. The Crypto- cerini are in external structure the most highly modified of Hymenoptera, if not of all the tribes of Insecta. i. The Myrmicini proper are defined by Eorel as having the antennae inserted near the middle, a little behind the front, of the head, wdiich has carinae on the inner sides, but none on the outer sides, of the insertions of the antennae; the clypeus ex- tends between the antennae. Certain genera of small European ants of the group Myrmicini display some most anomalous phenomena. This is especially the case in Formicoxenus, Anergates and Tomognathus. The facts known have, how- ever, been most of them only recently dis- covered, and some obscurity still exists as to many of even the more important points in these extraordinary life-histories. It has long been known that the little Formicoxenus nitidulus lives as a guest in the nests of Formica rufa, the wood-ant; and another similar ant, Stenamma westivoodi, which shares the same life,. Fig. 68.—Formicoxenus nitiduhis, male. (After Adlerz.) ^ Ann. Sue. ent. Belgique, xxxvii. 1893, p. Please note that these images are extracted from scanned page im
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