141 
FAyloliris mandibularis \Villiams. 
ee : 
Length 9.5-13 mm; black, wings with costa largely dark; male 
with very long mandibles; head large. 
I was fortunate in locating in a fallen tree trunk, in the lower 
part of the Makiling forest, a small colony of these remarkable 
wasps (Fig. 70). On August 17, 1917, two specimens were 
seen to enter a hole in the decayed wood and a third to 
alight nearby. This gave the settlement a strongly communal 
aspect, which was further accentuated by the fact that the wasps 

Fig. 70. Hyloliris mandibularis, 9, 3. 
had the strange habit in both sexes of keeping the wings in a 
semi-erect position* and then of moving them up and down a little 
and walking about at the same time, much as do the vespid 
wasps, Polistes, Icaria, etc. This habit is unique among the 
Larrinae, as perhaps also that of nesting in decayed wood. 
Later I saw a Hyloliris fly into one of the holes, with her com- 
paratively large immature orthopterous prey, Calypototrypus 
Sauss. (Fig. 71), beneath her. Several days later I dug up the 
colony, in which there appeared to be three actively-working fe- 
males and some freshly-emerged wasps, three cells containing 
crickets and cells with cocoons, both hatched and unhatched. The 
burrows, which were betrayed by sawdust, were very irregular. 
Two of them seemed to have a common entrance. Their courses 
in the soft decayed wood, though more or less parallel with the 
grain, were quite without order; old cells appeared scattered 

* A spider-wasp Pseudagenia gilberti Turn. which I observed in North Queensland, 
Australia, is colored much like a Polistes, which it resembles the more because of 
the habit of holding the wings semi-erect. I did not notice other Pseudageniae do 
this. 
