506 Mr. D. Sharp and Mr. F. Muir on the Comparative 
Family LEPTINIDAE. 
Form examined: Leptinus testaceus Miill., Brockenhurst. 
L, testaceus (Pl. LI figs. 55, 55). 
Median lobe large, chitinous on dorsal aspect, where it is drawn 
out into a point and on the sides, semi-membranous on the ventral 
aspect ; median orifice on the ventral aspect of the distal end (mo) ; 
median foramen large at basal end, and proceeding somewhat along 
dorsal side (b). Lateral lobes thin narrow bodies lying along the 
dorso-lateral parts of the median lobe and projecting somewhat 
beyond its tip. Basal-piece well developed, forming a ring through 
the base of which the median lobe passes and projects beyond, 
basally. Point of articulation on dorsal side. This basal-piece is 
distinct but of a semi-chitinous nature. Internal sac large, project- 
ing through the median foramen; it bears a patch of hairs near its 
apex, and about the middle a long slender chitin rod (a) attached 
to the sac by a broad square base; the ejaculatory duct does not 
pass through it. This differs but little from certain Silphidae. 
Family PLATYPSYLLIDAE. 
Form examined: Platypsylla castoris Rits., N. America. 
P. castoris (Pl. LX XVII fig. 229). 
This comes near to Leptinus from which it differs only in details. 
Median lobe tubular, pointed at apex and greatly enlarged on 
basal two-fifths; median orifice on ventral face near apex; median 
foramen large at base. Tegmen consisting of a basal-piece surround- 
ing the median lobe anterior to the basal enlargement, and a pair of 
narrow lateral lobes situate on the dorsal face. Internal sac smaller 
than in Leptinws and not passing through the median foramen when 
at rest, covered with hairs and flattened pointed scales; a thin 
flagellum arises from the apex. 
We are indebted to Mr. E. A. Schwarz for the 
opportunity of examining this interesting species. 
Family SCAPHIDIIDAE. 
Form examined: Scaphidiwm quadrimaculatum Ol, 
Brockenhurst. 
S. quadrimaculatum (Pl. LIV fig. 76). 
This is a characteristic Staphylinid type. Median lobe with distal 
half forming a wide tube, basal half bulbous, with a membranous 
