lained, since the incrassated posterior thighs of one sex and 

 the arcuated of the other, are characters that are wanting in 

 the species under investigation. We have placed it with Zo- 

 niiis, as it agrees tolerably well with Latreille's definition in his 

 Considerations Gefierales, page 215, where he has given Z.pr(S- 

 usta Fab. as his type, and separated those species with length- 

 ened maxillae, which he there calls Nemognatha. When the 

 oral organs of the whole genus have been carefully examined, 

 it will probably be found expedient to form 2 divisions. The 

 antennae of our species are composed of 10 joints only, I be- 

 heve, in both sexes ; the remarkable form of the labial palpi 

 appears to be not uncommon amongst this and neighbouring 

 genera, but whether the singular form of the mandibles be 

 general I am not able to say for want of other species for dis- 

 section. 



Although Mr. Stephens detected a solitary specimen of %o- 

 nitis testacea in the cabinet of the late Mr. Marsham, it has 

 never before been recorded as a British insect, and its name 

 and economy were equally unknown. 



During a visit to Dorsetshire in the autumn of 1820, I found 

 a larva in the decayed stump of a tree, which I gave to my 

 friend Mr. Dale, who discovered the beginning of the follow- 

 ing March, that it had changed to our insect ; — a valuable fadt, 

 which proves its affinity in economy to the CEdemeridce of La- 

 treille: we have since been favoured with specimens from 

 Mr. Bennet and Mr. Stone ; and last year it occurred in some 

 abundance upon the oaks and white-thorns in the New Forest 

 the end of June and beginning of July. 



In the British Museum there is a single unlabelled speci- 

 men of another species, of which we know neither the name 

 nor the history. 



Vinca minor (the Less Periwinkle) is introduced in the 

 plate. 



