90 Zoologica: N. Y. Zoological Society [HI; 3 



ior direction. There can be little doubt that the dentation of 

 the sides of the thorax is a very ancient character not only in 

 the Silvanids but also in the Cucujids (as restricted by Boving) , 

 since vestiges of the teeth can also be clearly seen in the imagines 

 of certain genera of the latter family {Cucujus, Brontes). 



I have already alluded to the fact that Eimausibius colonies 

 are much rarer at Kartabo than those of Coccidotrophus though 

 both species may occur in the same localities and even in differ- 

 ent petioles of the same young Tachigalia. And not only are 

 all the instars of Eimausibius smaller than those of Coccidotro- 

 phus but the colonies are also much less populous. The largest 

 I have seen consisted of less than a dozen beetles and not more 

 than two dozen larvas. The habits, so far as I have been able 

 to observe them, are much like those of Coccidotrophus. The 

 Eunausibiiis also feed on the nutritive parenchyma in the walls 

 of the petiole but they do not dig long grooves in the tissue but 

 only narrow elongate pits, nor do they build up their frass in 

 parallel or vermiculate ridges but plaster it in a thin layer over 

 the walls of the petiole, so that the latter are smooth and even. 

 The elongate entrance to the petiole seems not to be provided 

 with a wall of frass. In one petiole I found that the pair of 

 parental beetles had entered through a large hole about 2.5 mm. 

 in diameter which had evidently been made by some larger insect. 

 The beetles had plugged the opening with frass, leaving a small 

 elliptical opening in the center just large enough to fit the head 

 of the beetle when acting as a sentinel. Coccids are found in 

 the elongated pits in the nutritive tissue but are few in number 

 and of small size, though the Eunausibiiis solicit and drink their 

 saccharine excretions in the same manner as Coccidotrojihus. The 

 cocoons of Eimausibius, apart from their smaller size and some- 

 what more delicate walls, are very much like those of Coccido- 

 trophus and are, in all probability, constructed in the same man- 

 ner. 



I have seen so few colonies of Eimausibius that I can give 

 no account of its enemies nor of those of its coccids. In all prob- 

 ability it is even less able than the more vigorous and more proli- 

 fic Coccidotrophus to withstand the insidious attacks of Solen- 

 opsis altinodis. The whole appearance of the beetle and its colon- 



