Anatomy of the Male Genital Tube in Coleoptera. 619 



a concomitant obliteration of the anterior part of the 

 partition separating them. If we take the view that the 

 forms placed by us at present in Cuciijoidea are derived 

 from creatures that formerly possessed definitely dis- 

 tinguished lateral lobes, we must infer a transition more 

 or less similar to the above. If on the other hand we 

 admit that some forms may have originated and developed 



'SPHINDIDAE 

 CORYLOPHIDAE 

 PHALACRIDAE 



rcr>^■r»,M,^.r „ MONOTOMIDAE 



EROTY DAE / HELOTIDAE 

 (&LANGURIA / \ NITIDULIDAE 

 CRYPTOPHAfJDAE 



MYCETAEIDAE 



TR0CH0IDEU5 



ENDOMYCHIDAE 



OOCCINElilDAE 



(RHIPIPHORIDAE 

 (MORDELLIDAE 

 CIO I DAE 

 OtDEMERIDAE 



PmOCHROIDAE 

 TRICTENOTOMA 



ANThlCUS 



OTHNIIDAE 

 LATHRIDIU5 

 HETEROCERIDAE 

 CANTHARIDAE 



(PYTHIDAE 

 (AEGIALUIDAE 

 DIAGRYPNODES 

 ^^.^MELANDRYIDAE 



TR0G05ITIDAE-( bIturIOAE -CYATHOCERIDAE 



DERETAPHRU5 



BOSTRICHIDAE- 

 LYCTIDAE- 



COLYDllDAE 

 (AULONIUM) 



AFFINITIES OF THE CUCUJOID FAMILIES 



without having come into possession of lateral lobes, we 

 might assign Tliymalus to such a series; in which case 

 the // of our fig. 90 is merely tegmen, that has to some 

 extent simulated the appearance of conjoined lateral 

 lobes by becoming a little divided and emarginate at the 

 tip. Which of the two theories is the more probable 

 can only be decided by examination of a good series of 

 Trogositidae, and by ascertaining if development throws 

 any light on the subject. 



