63 
hatch was on December 9, 1916, or in about nine and a half 
months. Other Tiphia lucida showed a cocoon stage of eleven, 
twelve and thirteen and a half months. The emergences from 
a shipment were very irregular and often extended over several 
months. 

Pig. 27. Mutilla sp., which parasitizes the cocoons 
of Tiphia, X 14. 
The cocoons of this Tiphia were the ones most frequently dug 
up in the fields by Filipino grub-diggers. Their parasitism did 
not appear great, one or two yielding a rhipiphorid beetle, but 
numbers show ed small perforations indicz ating that ants hz id de- 
stroyed the contents. 
The country about Los Banos abounded in “velvet ants” or 
Mutillidae—many of small size. As these insects are known to 
parasitize the cocoons of various solitary bees and wasps, I was 
able to rear a small, two-spotted species (Fig. 27) from a bred 
cocoon of Tiphia lucida. On August 30, 1916, I buried seven 
cocoons, containing the quiescent pale yellowish 7iphia larva, in 
soil in a tumbler and introduced a small Mutilla with two white 
spots on her abdomen. (Fig. 27.) On September 3, I cut open 
these cocoons and ceana that two of the quiescent 7iphia larvae 
had been parasitized by Mutilla. In the one case the Tiphia larva 
Or 
