328 REVISION OP THE CICINDELID^E OF AUSTRALIA, 



observations go, constant in each species, except that often it 

 differs in the sexes, such sexual differences being constant. In 

 the genus Cicindela, sensu lato, as represented in Australia, 

 there are two quite different forms of the labrum. (1) The 

 Distypsidera-like form, which, though showing considerable 

 variation, is always large, convex, 7-dentate, the posterior tooth 

 being a lateral one (in C. iosceles Hope, the two teeth behind the 

 one at the extreme apex are bidenticulate, so that the labrum 

 appears 11-dentate). In the Distypsidera-like form the setse are 

 marginal, a seta being found in every notch between the teeth. 

 (2) The true Cicindela-form, which is shorter (and never of the 

 7-dentate form with lateral outer teeth) has the setae placed a 

 little behind the anterior margin (submarginal). 



Mentum. — This varies greatly. In the typical species of the 

 genus Cicindela the median tooth is very long, while in Distyp- 

 sidera and Nickerlea it is reduced to a mere obtuse prominence at 

 the bottom of the sinus (figs. 13, 14). In the genus Cicindela, as 

 used in this paper, it varies greatly, for in C. semicincta Brulle, 

 and all allied species, the median tooth is longer and more acute 

 than in C. ypsilon Dej.; while in C. doddi SI., (tooth small, but 

 sharp and triangular), C. iosceles Hope (tooth similar to that of 

 C. doddi, but a little less developed), and C. leai SI., (a little more 

 reduced, but still distinct and triangular), it is very much 

 smaller than in C. ypsilon. 



Labial palpi. — All those species which have the median tooth 

 of the mentum greatly reduced in size have the basal piece and 

 two basal joints of the labial palpi stout, and the apical joint 

 small; the true Cicindela-form is to have the penultimate joint of 

 the palpi long and slender. 



Colour. — Dr. W. Horn has informed me that, in the Cicinde- 

 lidaa, the dark portion of the elytra must be taken to be the 

 ground-colour, the whitish marks so frequently found on the elytra 

 being the secondary part of the pattern; a proper appreciation 

 of this fact is important. Leng in his " Revision " has the 

 following: — "In the maculate species the punctures cease, or 

 nearly cease, within the maculation, which is visible on the 



