Characters of the genus Cleonymus. 19 



external characters, which, be it remembered, point out pecuUarities in 

 internal organization, become, or are to be deemed, secondary ones: 

 indeed Mr. Curtis himself, in his observations upon Cleonymus, has 

 shewn that he did not always consider external organs in the light of 

 *' mere outline, or suchlike secondary characters." Upon the general 

 relative value of characters drawn from the trophi, antennae, and other 

 individual external parts, I hope at a future time to enlarge, referring the 

 student in the mean time to Mr. MacLeay's introduction to the Horse 

 Entomologicse, Vol. I. 



The following jire detailed generic characters of 



Cleonymus, Latr. 



The Head is transverse above, with the anterior rather broader than the 

 posterior margin ; nearly orbicular in front, rather convex, with two slight 

 impressions somewhat beneath the centre of the face for the reception of 

 the basal joint of the antennae, (A), ^yes rather large, lateral. Ocelli 

 three in a triangle on the crown. Antennce inserted somewhat beneath 

 the centre of the face, near each other, (A.) short, not much longer than 

 the head, geniculated, gradually thickened to the tips, 11 -jointed, first 

 joint the longest, second as long as the fourth, third the shortest, fourth 

 and five following of nearly equal length, tenth joint of similar size, but 

 produced on the outside, forming a sort of bed on that side for the recep- 

 tion o.f a portion of the terminal joint, which is conical. (B. represents 

 the antennae seen from the outside ; C. represents the three terminal 

 joints viewed from above; and D. represents the same viewed from the 

 inside, or from the situation of the tip of the other antenna.) I query 

 whether this singular formation be not a sexual character. 



Collar nearly square above, narrower than the head, rounded in front, 

 a little broader behind; the remainder of the Thorax as broad as the head, 

 having the scutellum rounded, and the narrow postscutel ? longitudinally 

 divided. The manitrunk, including its upper surface or true prothorax, 

 is completely hidden from view above (so that the Neck is not apparent) 

 by the collar or anterior portion of the mesothorax. 



Fig. E. represents the under view of the manitrunk with the head of the 

 insect removed; 6, b, represent the sides of the collar dilated beneath; 



B 2 



