64 



INSECUTOR INSCITI^ MENSTRUUS 



of a Spiny cushion. The eggs are attached to the leaf with 

 their bases very closely crowded together and apparently held 

 in place by a cement secreted by the female. Owing to their 

 tapering shape, the eggs radiate outward in all directions, the 

 central ones being upright, the outermost ones pressed against 

 the leaf -surf ace. The number of eggs in a cluster exceeds 

 150. 



The second type of egg, only recently established as belong- 

 ing to a distinct species described in the following as Mansonia 

 humeralis, is also deposited in a round cushion-like mass, as 



1. Mansonia titillans, small group of eggs. 



2. Mansonia humeralis, two eggs ; 2a, top view of terminal spines. 



just described for M. titillans. The number of eggs appears 

 to be about the same, but the individual eggs are very differ- 

 ent and give the mass a very peculiar appearance. 



The length of the single egg is about 1.2 mm. ; its greatest 

 width is nearer the apex, at about 0.9 mm." from base ; beyond 

 this it tapers to a short neck from the upper edge of which 

 project four pairs of horns upon very short stalks ; these horns 

 appear to be solid chitin and taper to a sharp point. The dis- 

 tance from tip to tip of opposite horns is from 0.3 to 0.35 mm. 

 The color of the egg is the same as in titillans, but the neck is 

 much darker in color and the horns are black ; the egg-surface 



