Anatomy of the Male Genital Tube in Coleoptera. 547 
Family BUPRESTIDAE. 
Forms examined: Huchroma goliath Lap., Panama. 
Chrysodema aurofoveata Guér,, New Guinea. Cyphogastra 
spp. ? New Guinea. Polybothris quadricollis, Madagascar. 
Acmacodera flavofasciata P. and M., Pyrenees. Stigmo- 
dera macularia Don., Australia. Belionota walkeri Wat., 
New Guinea. 
Figs. 160, 161 and 161a Pl. LXVII. 
Chrysodema aurofoveata (Pl. LX VII fig. 160). 
The median lobe consists of a strong chitinous dorsal plate, flat, 
almost parallel-sided, and pointed at apex, with a deep groove (a) 
running down each side of the ventral aspect ; this ventral face is 
membranous, with the median opening some distance from the apex, 
and the base prolonged into two short median struts. 'Tegmen strong, 
highly chitinised and flattened horizontally, with the lateral lobes and 
basal-piece consolidated into one piece. Lateral lobes consolidated 
for a short distance from their base on dorsal aspect, and for some 
distance on the ventral aspect; long, nearly parallel-sided, their 
rather slender tips rounded, and bearing short spines and a couple 
of hairs. Along the inner sides of the lateral lobes runs a chitinous 
projection which fits into the groove (a) on the median lobe and acts 
as a guide when this moves in and out of the tegmen. Internal sac 
undifferentiated. 
In fig. 160 the free apices of the lateral lobes are made to appear 
too short and blunt, and this defect is exaggerated by the exsertion 
of the median lobe. 
Polybothris quadricollis (Pl. LX VII figs. 161 and 161a). 
This is the same type as the last. Median lobe consisting of a flat 
dorsal plate, widest at the base and graduating to a point at apex, 
with a pair of median struts at base ; median orifice on ventral aspect 
near tip. A little behind the median orifice there is a slender chitin 
rod attached to the ventral membrane, and projecting into the lumen 
of the median lobe, to which muscles are attached. Lateral lobes 
flattened, curving up to a point on the inner side of the apex, with 
basal-piece consolidated to lateral lobes. The coadaptation between 
lateral and median lobes is not so complete as in Chrysodema. 
Internal sac undifferentiated. 
The Buprestidae differ from the Elateridae by the con- 
solidation of the basal-piece to the lateral lobes and by the 
beautiful coadaptation between the lateral and median 
