50 
Psyche 
[March 
position. The metapleuron is fused completely with the 
propodeum. In the dorsal aspect of the thorax (fig. 1), it 
will be noted that the right side appears to be large and 
swollen. This is probably due to the presence of wing 
muscles. A vestige of a scutellum distorted toward the 
Fig. 2. Right (female) side of thorax; EP, episternum; P, paras- 
cutal ridge; PL, upper plate of metapleuron; PN, pronotum; 
PRO, propodeum; S2, spiracular plate; T, transcutal suture; 
VW, vestigial wing; W, wing insertion. 
Fig. 3. Left (worker) side of thorax; MSN, mesonotum. 
right side may be seen in the specimen as well as a portion 
of a distinct metanotum. 
In the abdominal region the node presents an asym- 
metrical appearance. The right side is longer and its cor- 
ners more angular than the left side, so that each side is 
typical of its respective caste. 
