496 Mr. D. Sharp and Mr. F. Muir on the Comparative 
The Hydrophilidae possess an aedeagus of the trilobe 
form, with well-developed median and lateral lobes and 
basal-piece, but with undifferentiated internal sac. This 
is a generalised type. erosus departs from it furthest 
in L, signaticollis. 
Family STAPHYLINIDAE. 
Forms examined: Gyrophaena pulchella Heer, England. 
Homalota londinensis Sh.; H. elongatula Gr., and H. pavens 
Er., Brockenhurst. TZachinus subterraneus L., Brocken- 
hurst. Zachinoderus grossulus Lec. (? North America, no 
locality ticket). Ocypus cupreus Rossi, Brockenhurst. 
Staphylinus cacsareus L., Brockenhurst. Philonthus and 
Gabrius, numerous species. Creophilus erythrocephalus 
Fabr., Australia.  Quwedius ventralis Ar., Brockenhurst. 
Pinophilus rectus Sh., and P. mimus Sh., Amazons. Platy- 
prosopus sp. India. Othius fulvipennis Fabr., and O. melan- 
ocephalus Grav., Brockenhurst. Xantholinus glabratus 
Grav., Brockenhurst, and X. phoenicopterus Er., Australia. 
X. (Lulissus) chalybeus Mann, Brazil. Paederus riparius L., 
Brockenhurst. Lathrobium brunnipes Fabr., L. fulvipenne 
Grav., and JZ. boreale Hochh., Brockenhurst,  Stenus 
speculator Lac., Brockenhurst. Osorius sp. near ater Perty, 
Trinidad. MNodynus leucofasciatus Lew., Japan. Olophrum 
piceum Gyll., Brockenhurst. Leptochirus edax? loc. dub. 
Zirophorus bicornis Ol, Amazons. Micropeplus fulvus 
Er., England. 
Figs. 61-74 of Plates LII, LIII and LIV are devoted 
to Staphylinidae. 
Gyrophaena pulchella (P\. LII figs 61, 61a). 
Median lobe chitinous, tubular, flattened near tip and twisted and 
swollen slightly at base ; median orifice narrow, on ventral side near 
apex ; median foramen at base small. There are two pairs of spines on 
ventral side close behind median orifice. Lateral lobes large, broad 
and flattened; inner surface membranous, outer chitinous, and 
divided into several large sclerites; near apex there is a small 
articulated lobe bearing two stout hairs. The lateral lobes are 
attached to median lobe near base on ventral side of median 
foramen (pa). Internal sac medium size with a long flagellum (fg) 
arising from apex of sac and passing through median orifice. 
