7^^ 



Nachdruck verboten. 

 Uebersetzungsrecht vorbehalten. 



Tlie Spermatogenesis in Pentatoma up to the Formation 

 of the Spermatid. 



By 

 Thos. H. Montgomery Jr., Ph. D. 



With Plate 1—5 and 1 Textfigure. 



Contents. 



Introduction. 

 I. Reviews of papers on the spermatogenesis of Insects. 

 II. Observations. 



A. The spermatogonia and their mitoses. 



B. The 1st spermatocytes from the anaphases to the rest stage. 



a) Anaphase. 



b) Telophase. 



c) The large generation of spermatocytes. 



d) Rest stage. 



C. The spermatocytic mitoses. 



a) Prophases. 



b) The 1st spermatocytic monaster. 



c) The 1st spermatocytic metakinesis and dyaster. 



d) The 2nd spermatocytic division. 



D. Summary of observations. 



III. General considerations. 



IV. Literature list. 



V. Explanation of plates. 



Introduction. 



The object which formed the basis of these studies was a genus 

 of the family Pentatomidae (Hemiptera heteroptera). In using, 

 as an aid in the identification of the genus, Leunis' "Synopsis der 

 Thierkunde", it was found to come most closely to the genus Penta- 

 toma ; but since this genus has subsequently become considerably sub- 

 divided by the systematists, I am unable to state with certainty that 



Zool. Jahrb. XII. Abth. f. Morph. 1 



