54 
Psyche 
[March 
parapsis and the scutellum. The small metanotum of the male 
is apparently free throughout the greater part of its length. It 
lies in a deep suture which extends entirely across the thorax. 
The last portion of the thorax appears to be intermediate in 
structure between the metathorax of the worker and the epino- 
tum of the male. Its color would indicate worker tissue but its 
structure is not that of the typical worker metathorax. Both 
wings are present on the left side of the insect and both are 
fully developed. The petiole is cleanly divided along the mid- 
line of the body. The right half is higher and broader than the 
left and has an acute upper edge. The upper edge of the left 
half is obtuse and the coloration is a blackish brown. 
The differences in the shape of the opposite halves of the 
abdominal segments cause a pronounced asymetry of the gaster. 
Since the gastric segments of the normal male are of nearly uni- 
form length throughout, while those of the worker successively 
decrease in length after the second segment, their combination 
has resulted in a strong bending of the tip of the gaster towards 
the right. This bending has affected the male genital armature. 
All the elements in the left half of the male genetalia are present 
and individually quite normal 2 . Their relative positions, how- 
ever, have been somewhat altered. In the normal male the 
stipites are outermost in position. Just within and closely ap- 
pressed to each of these is a bifurcate organ composed of an 
outer, hooked volcella and an inner, foliate lacinia. Innermost 
of all and somewhat above the rest are the paired inner para- 
mera. In addition there are present two small lobed structures, 
the cerci. Ordinarily these lie just above the median lobes and 
are partially covered by the sixth gastric segment. They are 
apparently not a part of the genetalia and are mentioned here 
only because a single aberrant cercus occurs in the gynandro- 
morph. Fig. 3. shows the position of the male genital armature 
in the mosaic. The stipes (s) has been turned inward toward the 
center so that it occupies a position above the volcella (v) and 
2 Emery’s nomenclature is here used. For a discussion of the names ap- 
plied to the structures of the Formicid genetalia see Emery, Die Gattung 
Dorylus. Mol. Jahrb Band 8 1895. 
