536 Mr. D. Sharp and Mr. F. Muir on the Comparative 
tulatus L., England. Anthocomus sanguinolentus Fabr., 
England. Balanophorus masterst Macl., Australia. Dan- 
acaea denticollis Baudi, Piedmont.  Melyris abdominalis 
F., Africa. Henicopus armatus? Lucas, Reynosa. Psilo- 
thriv cyaneus Ol. England. Astylus fasciatus Germ., 
Brazil. Phloeophilus edwardsi Steph., England. 
Figs. 136-146 Pls. LXIV and LXV, also Fig. 186 PI. 
LXXI relate to these forms. 
Dictyopterus awrora. 
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. The 
lateral lobes apparently exhibit great diversity in the Lycid division 
of the Malacoderms. 
Lycostomus gestrot (Pl. 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 thoracicus (or an allied species) (P!. 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 toa 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 sae 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. 
Cratomorphus diaphanus (Pl. UXIV 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 
