88 Mr. J. O. Westwood on the Ckalcididce 



and is here very much depressed above, instead of being slightly 

 convex, as in the female of Colax dispar. (Fig. 3, Q. represents a sec- 

 tion of the abdomen of the latter insect at the fourth dorsal segment.) 

 The female antennae of both genera are very similar in formation.* 



The distinction between the females of the present genus and of Cleo- 

 nymus are far more striking, and may easily be discovered on reference 

 to the characters of each respective genus. 



As to the number of species belonging to this genus, there appear to be 

 several females in my cabinet agreeing with the female C. quadrum, but 

 which I have not yet had sufficient leisure thoroughly to investigate. I 

 have not, however, yet met with any male at all agreeing with the male 

 Quadrum. 



With regard to the insect which Mr. Curtis has considered as the female 

 of Cleonymus, he has observed " that the abdomen is longer, more 

 " depressed, and less compressed and angulated beneath than in the genus 

 " Colax, and that the female antennae (at least in the specimens before us) 

 " are thickened gradually to the apex ; they have not the ring-shaped third 

 " joint which that genus has, nor do the three last joints form a distinct 

 " mass.** The figure, indeed, which he has given of the antennae of a 

 female presumed by him to be that of Cleonymus depressus, although 

 much more nearly resembling the antennae of that species than the female 

 antennae of Cheiropachus, differs from the former not only in the forma- 

 tion of the terminal joints, but also in having a joint more than in Cleo- 

 nymus ; hence it is evident that it is referrible to some other (perhaps a 

 new) genus; but whether the seven species contained in Mr. Curtis's 

 cabinet, all of which he says are females, be or be not congenerous with 

 that from which his figure of the female antennae was drawn, I am not 

 able to state; at all events we may be led to suppose that such is the case, 

 or Mr. Curtis would doubtless have noticed the differences in their 

 antennae. 



It only remains for me to notice the formation of the thorax. And one 

 of the most conspicuous and valuable organs in the family is the collar, 



* That part of the antennae which in Colax dispar $ Mr. Curtis regards as 

 the third joint, is, in fact, formed of two minute ring-shaped joints, more 

 closely soldered together than in Cheiropachus. (See Fig. 3, P. a.) 



