AUTHOR’S ABSTRACT OF THIS PAPER ISSUED 
BY THE BIBLIOGRAPHIC SERVICE, APRIL 5 
THE MEIOTIC PHENOMENA IN THE SPERMATOGEN- 
ESIS OF BLAPS, WITH SPECIAL REFERENCE 
TO THE X-COMPLEX 
JOSE F. NONIDEZ 
Department of Zoology, Columbia University 
EIGHTY-SIX FIGURES 
CONTENTS 
[MRM GROG ELOMets mle yctre tees ci sresc cers ote ne ae lcie lo cds ens ielavs ic ee Meee DE 69 
II. Material and methods. i) 
Mimebhespernnatoconial mitoses: 5vesnces o-chins «ecsce ti caite en Goleta a aidets ce Ps 
VERE sperma LOeyilEs| Ricwererysiainc Petia O oeeialaloe'ciecsits «aloe wn eure eee ce TO 
1. The maturation maieones Be: Fete nicl stc deal te Ree chcstcte tala Rash Aver ol owe ah henge tostowe 76 
A. First maturation mitosis. sk 76 
B. The secondary Apeniaicerion cael ie! Bpeonde niseaga hon 
AUMUGOSIS oeo0s ene mntel tec ai eran See MRIS alts sceloele tok co eee WS 
Pelee (ere wich PerlOdwe thks. Soi teams NOs heel diese ek ne on ee 84 
AL Presynaptic stages and synapsis: 2.00.30... J..52s-.0eeece 8D 
DS OStSYNAD biG SCARES c.f ais Becicis) savejemveiaeresie's sine See Geleleealeasans 88 
C. The X- ie a during ‘the growth period .../02.5.06...0.00 89 
V. Discussion.. SO. cG-HiciGeMac uatcics Enla Slate rite maWanicere Aten sine sas 
1. The gr aman: per eae stay Sr A erat ote ist ler NekePay are sranetale SEKI aR tous Re 93 
Dam Nee N=COTMMPlExottg on! 5m aide ae atrctrepe eel ciceatae ec ties te eieaics Wiebe mvt OG 
NAD © ra WTS VOTES 5,5 See eis ar So, rer eR aL oma d eNO R eece idlcsane diel aSomom elke tens eee 
I. INTRODUCTION 
The formation of the male germ cells of Blaps lusitanica, a 
large beetle belonging to the family 'Tenebrionidae, has engaged 
my attention for more than three years, in an attempt to trace 
the history of the chromosomes throughout the spermatogenesis. 
In a first paper (14) I described in detail the spermatogenesis 
and the behavior of a peculiar complex—the X-complex, made 
up of three large chromosomes—throughout the postsynaptic 
stages and first maturation mitosis. Further progress was made 
later (15) and the results obtained in this form confirmed in Blaps 
waltli Seidl., a closely related species which possesses a similar 
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