536 Mr. D. Sharp and Mr. F. Muir on tlic Gomparative 



tulatus L., England. Anthocomus sanguinolentus Fabr., 

 England. Balanophorus mastersi Macl., Australia. Dan- 

 acaea denticollis Baudi, Piedmont. Melyris dbdomiyialis 

 F., Africa. Henicopus drmatus ? Lucas. Reynosa. Fsilo- 

 thrix cyaneus 01., England. Astylus fasciatus Germ., 

 Brazil. Phloeophilus edicardsi Steph., England. 



Figs. 186-146 Pis. LXIV and LXV, also Fig. 186 PI. 

 LXXI relate to these forms. 



Didyoptcrus aurora. 



Median lobe thin, flattened laterally and curved slightly up- 

 wards, there is a small spine on the dorsal face near the base. 

 Lateral lobes broad, nearly as long as the median lobe, consolidated 

 together for their basal three-fourths on dorsal face. Basal-piece 

 shorter than the lateral lobes, chitinous on the ventral aspect 

 only ; and there with a large emargination so that it articulates with 

 the lateral lobes by two slender projections. Internal sac undiffer- 

 entiated. This is a trilobe type with the lateral lobes consolidated 

 and forming a cover on the dorsal aspect of the median lobe. Tlie 

 lateral lobes apparently exhibit great diversity in the Lycid division 

 of the Malacoderms. 



Lycostomus gcstroi (PI. LXIV fig. 136). 



Median lobe long, thin, tubular, slightly dilated before tip ; 

 median orifice at tip, the dorsal edge prolonged as a curved spine. 

 Lateral lobes very small, firmly attached to base of median lobe. 

 Basal-piece comparatively small. Internal sac undifferentiated. 



Metriorrhynchus tlioracicus (or an allied species) (PI. LXXI 

 fig. 186). 

 Median lobe long and slender, consisting of a narrow chitinous 

 sclerite on the dorsal face, widened slightly on the distal half 

 and coming to a blunt point, the sides slightly curved downward; 

 membranous on the ventral face. Median orifice on the ventral aspect 

 near apex. Internal sac large and complex, stiffened by a narrow 

 chitinous sclerite (a) along one side and bearing several large spines ; 

 this sac is only partly invaginated in repose, the greater part being 

 folded under and held flat against the ventral face of the median lobe. 

 Lateral lobes forming two large globular and membranous pads with 

 a comparatively small basal-piece. 



Cratomoiphus diaplianus (PI. LXIV fig. 137). 



Median lobe large, complex ; chitinous on the dorsal aspect and 

 along the distal half, developed into a flange (a) on each side ; the 



