316 British Tenthrcdos. 



only each alternate tree that had been struck, one being 

 broken and one left. The road had, as you say, been blocked 

 up with them, so that the diligences for the day could not 

 get on. 



One of these thunder storms occurred at Rotterdam a few 

 days previous, and presented in its progress some interesting 

 and beautiful phsenomena. The day (26th Aug.) had been exces- 

 sively hot and sultry, with the wind at SSE.; at 4 p. m. clouds 

 began to approach from the N W. and some thunder was heard 

 in that quarter. At 5 it came nearer, and the lightning from 

 the north was frequent. Clouds then suddenly began to drive 

 from the east, carrying Avith them along the ground a vapour 

 like blue smoke, which rose upwards and soon became tinged 

 of a deep dusky red. The lightning was now continual, the 

 air seemed on fire, and the thunder rolled in one vuibroken 

 and unceasing peal. It grew very dark, and the rain poured 

 down in torrents. The storm passed directly over head, but 

 at a great height, and the lightning did not strike the earth. 

 The air shortly after became clear to the NW., the thunder 

 cloud slowly retiring in a SE. direction, when it seemed to 

 become fixed at the distance of six or eight miles, and at the 

 height of about 25°, and there the storm was seen exerting its 

 fury in the highest splendour. The cloud was one blaze of 

 fire, and the flashes of lightning darted from one quarter of it 

 to another in the most fantastic coruscations ; sometimes 

 zigzag, at others in streams of fire or running out in circular 

 lines of blue flame, or darting from it like the forked light- 

 ning which painters put into the hands of Jupiter. This fine 

 display of fireworks continued more than an hour; the moon 

 in the mean tune rose behind the cloud in great majesty, and 

 began to move along the sky, which was calm and serene in 

 every other quarter. There was no thunder heard, and the 

 streets and walks of Rotterdam were filled with admirers of 

 this interesting spectacle. Yours, &c. 



W. W. Jameson. 



BRITISH TENTHREDOS. 



A young Entomologist who makes inquiry in the Philosophical 

 Magazine for August, p. 1 55, concerning the British Tenthredos, 

 and requests their specific names and characters, is probably 

 not aware of the number of British species. — An entomologist 

 of the first eminence informs us that his cabinet contains about 

 150; and adds that there may probably be double that num- 

 ber, were all known. We believe that the collections of 

 Mr. Haworth and Mr, Stephens are equally extensive. We 

 know not, however, whether the inquii-y relates to the genus 



Tentliredo 



