538 Mr. D. Sharp and Mr. F. Muir on the Comparative 
Chauliognathus ? (Pl. LXIV fig. 139). 
The median lobe formed of a chitinous plate on the dorsal aspect 
and membranous on the ventral, slightly curved. The tegmen 
consists of two asymmetrical curved, pointed lateral lobes, and a 
small basal-piece connecting them. Internal sac a simple dilatation 
of the ejaculatory duct. 
The undifferentiated sac separates this from the other 
Telephorus forms; in this, as well as in the form of the 
aedeagus it reminds us of Lampyrid forms. There is 
nothing like this insect in the British Museum Collection. 
It is quite Zelephorus-like in shape, but has a large, ivory- 
like area on the pronotum, reminding one of the pallid 
spaces of the luminous organs of Lampyridae, etc., but we 
have no reason for supposing it to be luminous. 
Silis ruficollis (Pl. LXIV fig. 140). 
Median lobe short, wide, somewhat cone-shaped, broader at the 
distal than at the basal end. Tegmen complex, being in the form 
of a shallow cup-like piece produced on dorsal aspect as two broad, 
truncate lobes (//) which appear to represent the lateral lobes, and 
the dorsal edge prolonged as a ridge (a). Internal sac large and 
complex, with two diverticula at base on dorsal aspect studded 
with minute spines, and with long chitinous spines at apex. The 
basal part of the sac is not invaginated, only the apical portion. 
Telephorus (Rhagonycha) limbatus (Pl. LXV fig. 141, 
141a). 
Median lobe well developed, bulbous in form, with the median 
orifice at distal end and a small median foramen at base. The teg- 
men is of a complex nature and forms a complete cover for the 
median lobe. There is a well developed basal-piece (bp) with two 
large, truncate lateral lobes, meeting together on the ventral aspect 
(il) ; on the dorsal aspect is a large plate (a) projecting as a bilobed 
piece a little beyond the median lobe; this appears to be a develop- 
ment of the lateral lobes. The lateral edges of this plate are con- 
solidated to the latero-dorsal portion of the median lobe; on each side 
is a second lobe which is connected with the dorsal plate (a) at its 
base. The median lobe thus has no movement apart from the teg- 
men. Internal sac large and complex. 
Telephorus (Rhagonycha) testaceus belongs to the same type as T. 
limbatus. 
