WERNER MARCHAND 135 



favorable to the destruction of the eggs in the case of very dangerous 

 species which should be brought under control. The egg masses are 

 in fact very conspicuous and may be collected easily and quickly. 

 All egg masses observed were placed about 30 to 50 cm. above the 

 ground. 



The latest date on which oviposition was observed was June 14; 

 however, it may be that it takes place even later, as Lecaillon found 

 eggs containing larvs as late as July 22 (1907). The period of re- 

 production extends in this species, at least in certain years, from the 

 end of May to the end of June. The period given in Lecaillon's 

 note in 1906, of two to three weeks, was evidently too short. 



A detailed description of the egg mass is given (Plate 2, Figs. 33 

 to 38). The egg mass presents the aspect of a roughly subconical 

 body which under natural conditions is placed with the base below and 

 the vertex above. The axis of the cone is arranged about parallel to 

 the branch or stem which serves as support, and is placed in such a 

 way as to cut lengthwise through the conical surface and to be partly 

 enveloped by it. However, it would not be accurate to speak of the 

 egg mass as subconical, as certain authors (Brauer and Hart) have 

 done. The body of the mass is distinctly bilaterally symmetrical, 

 as shown in the accompanying figures. The plane of bilateral sym- 

 metry is determined by the stem which serves as a support and by a 

 crested longitudinal line placed on the side opposite the egg mass 

 (Plate 2, Figs. 34 and 35). On the other hand, it is possible, with 

 regard to the mass, to distinguish a vertical direction or orien- 

 tation, a horizontal anteroposterior one, following the plane of sym- 

 metry, and a horizontal lateral one, placed at right angles to this 

 plane. In the anteroposterior direction the base of the mass has its 

 greatest dimension (5 mm. in a specimen examined). In the two 

 other directions the dimensions are about the same and somewhat 

 smaller than in the preceding one. Posteriorly, the surface adhering 

 to the support is much larger than the opposite surface anteriorly. 

 Finally, in the specimens examined, the base of the mass was not 

 flat but perceptibly and progressively excavated from the periphery 

 towards the center. 



The egg mass is composed of eggs which are placed quite regularly 

 on top of each other, if observed vertically, or placed in successive 



