518 Mr. D. Sharp and Mr. F. Muir on the Comparative 
be an affinity with Rhizophagus. It is very different from 
the trilobe form. 
Cerylon is extremely difficult. If the ring at the base 
of the long tubular median lobe be really the tegmen as 
we have assumed, the genus might be said to be a trilobe 
form with tegmen greatly reduced, with concomitant 
great development of the median lobe in the tubular form. 
This in fact would then be a form of development in some 
respects parallel with what we find in Chrysomelidae.’ 
A thorough study of the forms at present associated in 
Colydiidae would probably lead to the dismemberment of 
the family, and would in addition throw a considerable 
light on Coleopterous taxonomy. 
Family CUCUJIDAE. 
Forms examined: Passandra fasciata Gray, Central 
America.  Hectarthrum cylindricwum Sm., Queensland. 
Cucujus mniszecht Grouv., Japan. Brontopriscus pleuralis 
and B. sinwatus Sharp, New Zealand. Brontes luctus Pase., 
Queensland. Diagrypnodes wakefieldi Wat., New Zealand. 
Chaetosoma scaritides Westw. (?), New Zealand. Lhizo- 
phagus depressus Fabr., England. 
Figs. 96-101 Pl. LVIII relate to these forms. 
Passandra fasciata (Pl. LVIII figs. 96, 96a). 
Median lobe short and fairly broad, with the median orifice at tip, on 
dorsal aspect ; the basal dorsal edge is continued as a broad strut («), 
which suddenly narrows and continues as a long fine strut (b). The 
tegmen forms a ring, the dorsal side is formed by a pair of long 
lateral lobes, wide at their base, where they are consolidated together 
into a plate, and narrow for the distal three-fourths where they are 
free ; the ventral portion of the ring is formed by a broad plate 
attached to the outer basal corners of the lateral lobes. Internal sac 
very long and narrow, except at its base where it is complex ; the 
basal complex part of the sac evaginates easily and then forms a 
cross-shape body (fig. 96); the distal portion (c) has the opening at 
its apex and forms a semi-chitinous trough ; the lateral portions (d) 
are semi-chitinous ; two small diverticula (e) turn basally, and basad 
of these are two more that bear hairs. The rest of the long internal 
sac is narrow. At the apex of the sac there is a semi-chitinous 
tongue (f) through which the ejaculatory duct passes. The enlarged 
part of the ejaculatory duct forms a chitinous tube. It is possible 
that this part of the duct passes through to apex of the sac and forms 
a flagellum. 
