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. Bcrosus departs from it furthest 

 in B. signaticollis. 



Family STAPHYLINIDAE. 



Forms examined : G^ropliaena pulchella Heer, England. 

 Ilomalota lonclmcnsis Sh. ; H.eloiigatukcQr., and K.pavens 

 Er., Brockenhurst. Tachinus subterraneus L., Brocken- 

 hurst. Tachinoderus grossulus Lee. (? North America, no 

 locality ticket). Ocypus cupreus Rossi, Brockenhurst. 

 Staphylinus cacsareus L., Brockenhurst. Philonthus and 

 Gabrius, numerous species. Creophilus erythrocejjhalus 

 Fabr., Australia. QuecUus centralis Ar., Brockenhurst. 

 Pinojjhilus rectus Sh., and P. viimus Sh., Amazons. Platy- 

 jjrosopus sp., India. Othius fidvipenn is Fahv., and O.melan- 

 occphalus Grav., Brockenhurst. Xantliolinus glahratus 

 Grav., Brockenhurst, and X. 2)lwcnicoptcrus Er., Australia. 

 X. {Enlissns) chalyheus Mann, Brazil. Pacclerics riparius L., 

 Brockenhurst. Zathrohium hrunnipcs Fabr,, L. fulvipennc 

 Grav., and L\ lo^-ealc Hochh., Brockenhurst. Stenus 

 speculator Lac, Brockenhurst. Osoi'ius sp. near ater Party, 

 Trinidad. Nodynus leucofasciatus Lew., Japan. Olophrum 

 piceum Gyll., Brockenhurst. Leptochirus cdao:. ? loc. dub. 

 Ziropliorus hicornis 01., Amazons. Micropeplus fidvus 

 Er., England. 



Figs. 61-74 of Plates LII, LIII and LIV are devoted 

 to Staphylinidae. 



Gyrophaena p)idchella (PI. 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 {im). Internal sac medium size with a long flagellum {fg) 

 arising from apex of sac and passing through median orifice. 



