400 
the second, although hardly shorter on its outer margin, the fourth joint 
cylindrical and tapering in apical half, about as long as the first two 
joints combined; labial palpi very short, the middle joint transverse, the 
apical joint somewhat the longest, conical, and hardly more than twice as 
long as thick. 

Fig. 2. Synaspidia pretiosa. A. Antenna of female. B and C. Mandi- 
ble in dorsal and frontal views. 

Fig. 3. Synaspidia pretiosa. Antenna of male. 
Thorax moderately convex above, distinctly wider than the depth dorso- 
ventrally; the axillae and seutellum very strongly depressed and lying in 
one plane, the apex of the seutellum very briefly elevated, yet abruptly 
declivous at the margin, the latter very finely acutely rimmed, just inside 
of which is a delicate submarginal furrow. Propodeum short and very 
transverse, considerably longer at the sides and there declivous, the basal 
margin finely carinate; on both sides of the middle this basal carina 
branches, the branch on each side curving backward and outward towards 
but not reaching the posterior margin halfway between the foramen of 
the petiole and the lateral corner; just inside of the spiracles on each side 
