228 HAROLD R. HAG.\N 



ently a bulging of this area, and the sweUings thus produced 

 develop later into the antennae. Soon the labrum can be dis- 

 tinctly recognized as a conical evagination a little anterior to 

 the proximal edges of the bases of the antennal rudiments. It 

 is distinctly an unpaired organ, but a line of bifurcation is visible, 

 even after the revolution of the embryo, indicating its primitive 

 paired condition. This is also the view held by Viallanes ('90) 

 for M. religiosa. The protuberances produced on the buccal 

 and succeeding areas arise in a manner ciuite similar to those of 

 the antennae. The development of the swellings in the thoracic 

 region proceeds much more rapidly and they are at all times more 

 conspicuous than those of the buccal or abdominal areas. My 

 preparations show that the antennal rudiments appear first, 

 followed by the rudiments of the thoracic appendages, then 

 appear practically simultaneously the rudiments of the labrum 

 and the maxillary appendages. This is not entirely in conformity 

 with the views taken by Vaillanes ('90) and Giardina ('99) in 

 their studies of Mantis religiosa. 



As posterior growth of the embryo progresses, the definitive 

 segments of the abdomen become more clearly recognized in 

 antero-posterior sequence. By the time that the first five 

 abdominal segments are recognizable, the terminal enlargement 

 undergoes a change, developing into the telson, and appears 

 ventrally flexed by the time two more segments are visible, 

 (fig. 3). The abdominal appendages arise as evaginations in a 

 manner analogous to the others. They consist of a pair of finger- 

 like pleuropodia on the first abdominal segment and of merely 

 prominent swellings on the remaining segments. The telson, 

 however, has prominent projections which undergo marked 

 changes during development. In Stagmomantis they are all, 

 except the pleuropodia, much more developed, resulting in a 

 series of bladder-like organs. The first abdominal pair consists 

 of conical finger-like processes which are quite alike in both 

 Paratenodera and Stagmomantis. The development of the 

 structure of the telson I hope to make the subject of a future 

 paper. 



