33 THE ENTOMOLOGIST. 



time, changing entirely both as to colour and markings ; it also 

 appeared to have decreased in size. The colour was a darker 

 brownish yellow (figs. 6 and 7). In the place of the former little 

 triangle on the vertex of the head were now to be seen two fine 

 black lines of equal width ; the markings on the back were 

 distinctly brown, more sharply defined, and less curved than 

 before ; they also extended further, and there was now a black line 

 on the last segment (fig. 7). 



The larvffi, for the other had shortly afterwards undergone the 

 same moulting, now ceased eating, and crept into the ground, or 

 rather into the mould which I had placed in their glass, where 

 they made a double cocoon, one of which is represented at fig. 8. 

 I failed, however, to obtain anything from these cocoons, so that 

 my trouble in the matter was thrown away. 



On the 21st of the following September, 1873, I found 

 a considerable number of the larv?e of this species on Circcea 

 liitetiana in the wood at the Hague, where the plant in question is 

 very common. I could observe no difference between these and 

 the larvffi taken on the fuchsia. I endeavoured to rear a good 

 number, but to my astonishment, in the following spring, with the 

 same result ; not a single imago made its appearance. In the 

 mean time I had discovered, from the above-mentioned work of 

 Kaltenbach, that my larvae were the second state of Tenthredo 

 Colon, Klug. I consequently determined to search the plants of 

 CirccBa lutetiana in the wood in May and June to see if I could 

 find the imago. It was not, however, until the 24th of July, when 

 I had almost thought of giving it up, that I saw a pair of sawflies 

 flying about the plant ; this was about one o'clock in the afternoon, 

 and the day was sunny ; they seemed to be chasing each other. I 

 captured them, and recognised T. Colon. I saw some more the 

 same day, but I was not able to take any of them. On the 

 following day, the sun only coming out now and then, I saw 

 in these intervals of sunshine several imagos evidently about to 

 pair. I captured several pairs, and on taking them home I found 

 they were all the same species. On the following day, however, 

 which was rainy, I could find no more ; the weather continued 

 to be wet for some time after, and I never met with the species 

 again. 



Compared with the number of larvae to be found in the wood 

 in the autumn, the number of imagos on the wing was certainly 



