570 Mr. D. Sharp and Mr. F. Muir on the Comparative 
tube (a) into which the two ducts lead. In the absence 
of knowledge as to the development it is not advisable to 
attempt an explanation of this form, but it appears to be 
not improbable that it may represent the stenazygos. 
The student will in looking at this figure recollect that 
the part of the sac that is the more anteriorly placed is 
really the apical part; the sac in Cerambycidae being 
completely inverted, the junction of the ducts with the 
sac 1s really the apical, or distal, portion of the genital 
tube. 
Family ANTHRIBIDAE. 
Form examined: Phloeobius alternans Wied., India. 
Figs. 225 and 225a Pl. LX XVI. 
Phlocobius alternans (Pl. LX XVI figs. 225, 2252). 
Median lobe forming a short, flattened tube ; the ventral and dorsal 
edges of median orifice pointed, the ventral projecting beyond the 
dorsal, the orifice thus forms a slit extending back along the sides ; at 
the base the median lobe is prolonged into a pair of long, thin-struts 
(ms). Tegmen forming aring with dorsal cap-piece and a ventral 
strut, the cap-piece having a ridge across where it becomes more 
strongly chitinised, and at the tip bearing long hairs. Internal sac 
large, having a large diverticulum, and at its apex a membranous 
flagellum-like organ, 
The few other Anthribidae that we have examined are 
all on the same type although the details differ, 
Family CURCULIONIDAE. 
Forms examined: Hupholus chevrolatt Guér., New 
Guinea. LPolycleis plumbeus Gueér., S. Africa. Lrachycerus 
apterus L., S. Africa. Belus bidentatus Macl., Australia. 
Mecocorynus loripes Chevr. E. Africa. Sphenophorus 
obscurus Boisd., Hawalia. 
Figs, 222, 223 and 224 Pl. LXXVI. 
Eupholus chevrolati (Pl. LX XVI figs. 222, 222c). 
Median lobe a short flattened tube, with ventral edge of median 
orifice projecting beyond dorsal edge, and pointed ; from each side of 
base projects a long median strut (ms). Tegmen forming a ring-piece 
with a pair of delicate, but quite distinct prolongations on the dorsal 
aspect, and central strut on the ventral aspect. Internal sac long, 
