different form of the antennae. Mons. Macquart has separated 

 Trigonometopus from Tetanocera in consequence of consider- 

 able difference in the relative proportions of the joints of the 

 antennae, the 2nd joint being equal to, or greater in length 

 than the 3rd in the latter genus, and shorter than the 3rd in 

 the former. 



There is still so great a variety of character in the genus Te- 

 tanocera, that most probably Desvoidy's groups will be event- 

 ually adopted. Some species have the 2nd joint of the antennae 

 much shorter than others, sometimes the seta is plumose, at 

 others naked, and the transverse nervure is straight or waved 

 in different species : such characters might certainly be well 

 employed in the formation of sections, which are of great 

 value in the study of Natural History, as they lead to a close 

 examination and philosophical inquiry into the structure and 

 affinities of allied species ; but all the advantages thus obtained 

 are too frequently more than counterbalanced by the anxiety 

 to give names to trifling groups, which were never destined 

 by Nature to hold the rank of Genera. 



The interesting insect before us was not known to be a na- 

 tive of this country until Mr. Dale met with three specimens 

 in the neighbourhood of Glanville's Wootton; they were 

 taken off some rushes growing in a gravel pit the end of May, 

 and from them he has liberally supplied my cabinet. 



The Plant is Aira (Deschampsia Beauv.) caspitosa, Turfy 

 Hair-grass. 



