1968] 
Evans and Matthews — Microstigmus 
133 
Microstigmus comes Krombein, mature larva. Fig. 1. Lateral view. 
Fig. 2. Head, anterior view. Fig. 3. Mandible. 
evenly arcuate; labrum apparently completely without setae or sen- 
soria, but epipharynx bearing numerous weak but fairly large spinules 
visible under high magnification. Mandibles without setae, rather 
broad basally, each tapering to a tridentate apex, the inner margin 
also with an unpigmented process which terminates in several (usually 
four) slender papillae. Maxillae large, apparently completely smooth 
and without setae or spinules ; galeae absent ; palpi concial, about 20/jl 
long. Labium broad, smooth, and rather blunt; palpi widely sep- 
arated 5 slightly shorter and blunter than maxillary palpi ; spinnerets 
apparently lacking. 
