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 Cucujoidea 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 
MONOTOMIDAE 
MYCETAE!DAE EROTYLIDAE 
HELOTIDAE 
& LANGURIA NITIDULIDAE 
TROCHOIDEUS | \  CRYPTOPHAGIDAE anita 
OMYCHIDAE 
Ener lt OTHNIIDAE 
COCCINELLIDAE LATHRIDIUS 
HETEROCERIDAE 
RHIPIPHORIDAE i CANTHARIDAE 
MORDELLIDAE mehes tac ( PYIKIDAE 
CIOIDAE EFF i ArGIAUTIDAE 
OEDEMERIDAE\. \. DIAGRYPNODES 
AETOSOMA 
PYROCHROIDAE Pecatbon ON Ty _-— ~MELANDRYIDAE 
TRICTENOTOMA TROGOSITIDAE—{ CVF FINE —CYATHOCERIDAE 
DERETAPHRUS 
BOSTRICHIDAE 
LYCTIDAE 
COLYDIIDAE 
(AULONIUM ) 
AFFINITIES OF THE CUCUJOID FAMILIES 
without having come into possession of lateral lobes, we 
might assign Zhymalus 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. 
