No. 2.] HABITS OF PONERA AND STIGMA TO MM. 1. 45 



the head is finer, that of the thorax and node much denser and 

 more distinct. Emery also mentions some differences in the 

 neuration of the wings of the male : " in den Fliigeln verbindet 

 sich aber die Costa rccurrcns etwas weiter von der Gabelung 

 mit clem hintern Ast der Costa cnbitalis, ungefahr wie bei der 

 europaischen P. piinctatissima." 



Figs, i, 2, and 3, from camera drawings, represent the out- 

 lines of the male, female, and worker of the American coarctata. 

 The eyes of the worker are minute and vestigial, those of the 

 female considerably and those of the male very much larger. 

 The worker has no ocelli ; those of the female are small, while 

 in the male they are very prominent. The node in the male 

 and female is more slender than that of the worker, and of a 

 somewhat different shape. The antennae of the male are of 

 nearly uniform thickness throughout and 13-jointed, whereas 

 the geniculate antennae of the female and worker are 12- 

 jointed, with a long basal joint, or scape, and a club-shaped 

 funicular portion, with much shortened middle joints. The 

 worker and female are provided with a long sting ; while the 

 pygidium of the male ends in an acute point. 



The coloration of the female and worker is highly variable. 

 Typical specimens have the head, thorax, node, and base of 

 the abdomen black, the mandibles, clypeus, frontal carinae, 

 antennae, legs, posterior third of the first abdominal segment, 

 and the tip of the abdomen from the base of the fourth seg- 

 ment, red or yellow. Very often the ventral portions of the 

 trunk are more or less suffused with red or yellow, especially 

 when the specimens are immersed in alcohol. Some specimens, 

 probably more or less immature, are red or yellow throughout. 

 The body is covered in all cases with short pale pubescence, 

 which on the head forms two lines, one on either side running 

 parallel with the straight lateral edges. These lines are appar- 

 ent only in dry specimens seen in a certain light. The male 

 is black, with the palpi, trochanters, knees, tips of tibiae, and 

 the tarsi light yellow. The genitalia and the incisures of the 

 segments of the slender abdomen are also more or less yellow 

 or piceous, as are also the stigma and veins of the colorless 

 wings, both in this sex and in the female. 



