168 [Jiiiy. 



o (4) Secoml ventral segment at most gently inclined from the base ; hind 



tibiae not spinose. 

 (7) Head viewed from in front witli the vertex behind the posterior ocelli 



generall}' distinctly punctured, sometimes subrugose, but the 



individual punctures for the most part clearly distinguishable; 



basal pubescent * bands of the f.agellimi of antennae very strongly 



dilated at one end. 



(Basal abdominal segment conspicuously punctured, the larger 



punctures not very fine and generallj' deep, the smaller ones between 



these excessively minute uuder a strong lens, so that the contrast 



between the two kinds is very great) 



.... gibbns L. 



7 (6) Head immediately behind the ocelli generally rugose, with few or no 



distinct punctures; basal pubescent bands of flagellum not thus 

 strongly dilated. 



(Punctures of basal abdominal segment finer and less conspicuous, 

 the larger ones usually less distinct, and the contrast between those 

 of different size less striking.) 



8 (9) When the insect is viewed from beneath and from the front, the hair- 



fringe of the hind trochanters is less conspicuous than that on the 

 adjoining part of the femora, the hair being evidently shorter on the 

 former; head when the vertex is viewed from above wider and 

 thinner, the sides behind the eyes being much more rounded away 

 to the occipital angles (the head of gihbus is of much the same form 

 and this common species can be used for comparison) 

 .... reticHlatu!< Th. 



9 (8) Hind trochanters, viewed as above, with the white hair-fringe similar 



to tliat on the femora at the part where the fringes adjoin one 

 another; head with the vertex comparatively subquadrate, not 

 nearly so much i-ounded away at the sides (and in this respect 

 distinct from either (jibhus or reticulatus) 



.... monilicornis K. {subqiiadratus Sm.). 



10 (I) Hind surface of the antennae with evident sculpture under a strong 



lens, often appearing reticulated or with very close, hue punctures 

 (due really to reticulation), the antennae themselves in most species 

 much shorter than in any of the preceding, and uo area of dense 

 short pubescence is found on either the hind trochanters or femora 

 beneath. 



11 (12) A large species, robust, with strongly, closely punctured mesothorax 



and scutellum, the basal abdominal segment with irregular and 

 remote, but conspicuous puncturation, the second with a very 

 conspicuous band of close and not very fine punctures, occupying at 

 least the basal third riifiventris Panz. {riihicundus v. Hag.). 



12 (11) The large species have tlie basal abdominal segment with at most 



very feeble and few punctures. 



13 (28) Hair-band of 10th antennal joint not covering nearly the whole of 



the joint, at most occupying about half the face of this. 



* For the sake of uniformity the 10th antennal joint is used in comparing the bands, these 

 becoming less developed on the more basal joints. 



