8 
Psyche 
[March 
in Patrobus longicornis and foveocollis, but without the subapical left 
side tooth of longicornis and, compared with foveocollis, symmetric. 
The shape of the apex, however, generally has little generic value in 
carabid beetles. 
The internal sac of the penis is less complicated than in most 
Patrobus. The “apical plate” (Darlington; “Manschette”, Kiihnelt, 
1941), forming the bottom (anterior part) of the eversible sac when 
in repose, is slightly spiral, but not at all to the extent of the sibiricus 
group of Diplous (Kiihnelt). It is not prolonged into a spine, as in 
the North American Diplous (contrasted with the Siberian repre- 
Fig„ 1. Platypatrobus lacustris Dari. Penis (c) and parameres (a, right; 
b, left). The dark parts of the internal sac are not isolated sclerites but 
thickened margins of lamellae. 
sentatives of the genus). It lacks accessory spine(s), in contrast to 
Patrobus. Presence of spines was used as a generic character of 
Patrobus by Darlington, but there is no spine in the Palaearctic P. 
assimilis Chd. 
The most characteristic feature in the internal sac of Platypatrobus 
is the dorso-basal part of the “apical plate”, which protrudes into 
