256 [November, 



the antennae and legs is in most cases more than proportionate to that 

 of the body, and takes place in the same distributional order. This 

 seems to indicate some causal connection between the dimensions of 

 the insect and its topographical distribution, as though local races are 

 in process of formation. 



A similarly wide range exists in the 5 of T. antennatus, which 

 runs from 4 mm. to 6f mm. ; the smallest examples I have seen are 

 from Lymington, Hants, where I toolc them amongst Scirpus iniaritvrmis. 

 The size of the ^ in this species is much more uniform, lying between 

 3| mm. and 4 mm. 



It may be noted here that there is much variation also in the colour 

 of these insects, especially in T. avtennaivs, and there seems to be a 

 great tendency for green to pass into red and vice versa. The lightest 

 specimens of T. antennatus are hardly to be distinguished from typical 

 T. savvdersi in coloration, but T. antennatus may always be recognised 

 by the almost glabrous condition of the basal antennal joint, the hairs 

 being extremely minute and difficult to see. T. saundersi has very 

 distinct hairs on this joint ; in T. viridis, which also has hairs, this 

 joint is considerably shorter than in T. saundersi, and the insect also 

 is smaller. T. antennatus ? almost always has a central black line 

 running through the head, pronotum, and scutellum, -but occasionally 

 this is reduced to a short line on the vertex or is altogether missing. 

 Usually, also, even if the broad fuscous markings near the elytral 

 suture have disappeared, the actual inner margin of the clavus is 

 inf uscated ; but again, this feature occasionally disappears as well as 

 the central line on the fore parts, and the insect assumes the coloration 

 of T. saundersi, which is always immaculate. The 1^ of T. saundersi 

 has similarly a central black line, which sometimes expands into a 

 black triangle at the apex of the scutellum, and sometimes ceases at 

 the end of the pronotum, leaving the scutellum immaculate. T. viridis 

 (^has more black about the fore parts, but is best distinguished by the 

 shorter basal joint of the antennae ; it must be admitted, however, 

 that this species is not very well defined. From the above it will be 

 seen that, on the whole, the most reliable criterion for specific deter- 

 mination is to be found in the nature of the basal joint of the antennae. 



The genital armature of the ^ of T. saundersi is of an extra- 

 ordinary form, which, however, is of generic, and not of specific, 

 significance. The left clasper consists of a long and stout appendage, 

 which, starting on the left side, passes across the end of the abdomen 

 beneath to the right side, and then makes a sudden and rather wide 



