518 Mr. D. Sharp and Mr. F. Muir on the Comparative 



be an affinity with BMzophagiis. 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. Hectarthnim cylindricitm Sm., Queensland. 

 Cucujus mniszechi Grouv., Japan. BrooitojJO'iscus plcuralis 

 and B. sinuatus Sharp, New Zealand. Brontes luciusVa&c, 

 Queensland. Biagrypiiodes wakejieldi Wat., New Zealand. 

 Chaetosoma scaritidcs Westw. (?), New Zealand. Bhizo- 

 phagus depressus Fabr., England. 



Figs. 9G-101 PI. 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 (k), 

 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 (/) 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 llacrellum. 



