32 COLEOPTERA. 



Haviug somewhat the gelatinous appearance of T. teucrii 

 (common to most apterous species), this insect is allied to 

 atriciUa, from which it differs in its averao-e rather larojer 

 size, lighter and non-metallic head and thorax, and less 

 regularly oval outline (the greatest width being nearer the 

 apex), the more perceptible shoulders and less obtuse apical 

 angles of its elytra, of which the punctuation is rather 

 stronger and evidently disposed in stride, especially towards 

 the base, its longer posterior tarsi, the longer and stronger 

 spurs of its hind tibias, and its stouter antennae. 



It also exhibits in some characters a slight superficial 

 resemblance to T. suturalis, from which its much lighter- 

 coloured head and thorax, larger size and heavier build, less 

 evident shoulders, longer antennas, &c., readily distinguish 

 it. The well-defined dark sutural stripe of that species, 

 moreover, reaches from the base to the apex of its elytra ; 

 whereas in the most marked individual that I have seen of 

 T. distinguenda (taken since the publication of my descrip- 

 tion), the usual narrow rufescent sutural edging is only 

 slightly dilated and becomes somewhat darker for the lower 

 two-thirds, contracting again just before the apex. In this 

 example, also, the hind tibiog are more or less pitchy. 



I have in my description alluded to variation in the 

 degree of punctuation of the thorax exhibited by different 

 individuals in this (and, of course, in other) species. To 

 this observation I may add, that among a considerable num- 

 ber of normal specimens taken by Mr. Champion (all toge- 

 ther), is one which he has kindly presented to me, and 

 which, though undoubtedly belonging to T. distinguenda^ 

 departs considerably from the others in having its antennse 

 of more feeble development, its build broader and shoulders 

 more evident, — being, in fact, more Aphthoniform. 



