ON CHEESE AND BACON-HOPPERS. 501 



beyond the middle. The number of transverse nervures uniting 

 these two longitudinal ones is various ; but in Isogenus and 

 Perla it varies between twelve and eighteen ; in Chloroperla 

 between three and six. From Nemoura the genus Chloroperla 

 sufficiently differs, in its possessing the two caudal setas. Of 

 this genus there are several species inhabiting this country, of 

 which the most abundant are the C. viridis of Fabricius, and 

 the C. lutea of Latreille. There is also a minute species, 

 which abounds in Herefordshire, frequenting the alders by the 

 sides of the trout streams : a — it is a most transparent, delicate 

 little creature. 



Chlo. apicalis. Tola hdeo-viridis, oculis antennarum apici- 

 busque nigerrimis. (Long. 3 lin.) 



Entirely of a pale delicate green, with the eyes and extreme portions 

 of the antennae intensely black. 



Art. XLVIII. — Notes on the Cheese and Bacon-Hoppers 

 and the Cheese-Mite. 



TO THE EDITOR OF THE ENTOMOLOGICAL MAGAZINE. 



Sir, — I hope that you will excuse the liberty that I have 

 taken in addressing this letter to you ; but if you think the 

 following observations upon those pests (as they sometimes 

 are) of the larder and the dairy, the cheese and bacon hoppers, 

 and the cheese-mite, worthy a corner in your interesting mis- 

 cellany, they are at your service. 



I am very much delighted with natural history in general, 

 especially with that branch of it treating upon insects, their 

 habits and dispositions, and I have observed with pleasure the 

 great interest taken in it by all classes of persons ; a certain 

 proof of this is the increase of works treating upon natural 

 productions, especially of those written in a popular manner, 

 and adapted for general readers. It should be a rule with 

 the authors or editors of such works to be the more guarded 

 in their expressions and descriptions in proportion as they 

 depart from scientific detail, as an error is more easily impressed 



a Common in like situations near Nantes in France. — Ed. 



