Anatomy of the Male Genital Tube in Coleoptera. 487 
and, when invaginated, coiled up, with a long, slender flagellum 
arising from apex with external opening of duct at tip (not shown 
in figure). 
Therates labiatus (Pl. XLVII fig. 29). 
Median lobe tubular, curved, thick, smaller and slightly flattened 
perpendicularly at base, median orifice at distal end, median foramen 
at basal end. Tegmen consisting of a pair of thin symmetrical 
lateral lobes, reaching to near tip of median lobe, and a wide 
V-shape basal-piece. Internal sac large with chitinous plates and 
two chitinous spines on sac, one curved and thin, the other short, 
thick and straight ; the duct enters at apex but not through spine 
(i, e. the spine is not of the nature of a flagellum). 
Tricondyla aptera. 
Median lobe curved, and tubular as in Manticora. The tegmen 
consisting of slender lateral arms and V-shaped basal-piece, as in 
C. tortwosa. Internal sac median size with large diverticula near 
apex and a large, strong bent spine on sac which is not traversed 
by the duct, the duct opening on apex of a small membranous 
tongue at the tip of the sac. 
Obs.—The Cicindelid aedeagus is similar to that of Cara- 
bidae in structure ; but is distinguished from all the Carabid 
types we are acquainted with by the presence of a basal- 
piece in the form of a sclerite on the ventral side of the 
median lobe. In this respect they resemble other Coleoptera 
more than the Carabidae do; but in the development of 
the internal sac with spines and a long flagellum they are 
more highly specialised. A great number of the Carabids 
are asymmetrical, whilst the Cicindelids are generally sym- 
metrical or nearly so. The diagnostic of the family is the 
same as that of the other families of the Caraboid series, 
except as regards the basal sclerite, which appears to be 
various in the series, 
Family CARABIDAE. 
Forms examined: Carabus violaceus L., Brockenhurst. 
Cychrus ventricosus (teste Leconte), California. Metrvus 
contractus Esch., California. Blethisa multipunctata L., 
England. Nebria brevicollis Fabr., Brockenhurst. Mor- 
molyce phyllodes Hag., loc.? Pheropsophus agnatus Chd., 
China. Clivina fossor L., Brockenhurst. Anthia sexgut- 
