Anatomy of the 3fah Genital Tube in Coleojotera. 487 



and, when invaginated, coiled up, with a long, slender fla^'ellum 

 arising from apex with external opening of duct at tip (not Bhown 

 in figure). 



Therates lahiatus (PI. XL VII 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. tortuosa. 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- 

 hidae 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 Carabid ae 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 : Carahus violaceus L., Brockenhurst. 

 Cychrus ventricosus (teste Leconte), California. Metrius 

 contractus Esch., California. Blethisa multipunctata L., 

 England. Nehria brevicollis Fabr., Brockenhurst, J/br- 

 molyce phyllodes Hag,, loc. ? Fheropsophios agnatus Chd., 

 China. Clivina fossor L., Brockenhurst. Anthia sexgut- 



