260 QUARTERLY JOURNAL. 



galls, and enter the ground, ere they assume the pupa form. Tke 

 larvae of a few, which infest grains and grasses, do not produce 

 galls, but lie concealed between the natural clefts of certain parti 

 of those plants. 



It is a singular and interesting fact, that these minute creatures 

 all so nearly alike in their colors and appearance that the nake( 

 eye can scarcely detect any difference between them, will go fortl 

 and each select for itself a particular part of a particular plant, ii 

 which to deposit its eggs ; one choosing a leaf-bud, another ; 

 flower-bud, another the tender bark of the young twigs, am 

 another it may be, the bark of the roots, or the petiole, or th 

 nerves of the expanded leaf. Equally singular is it, that the eggs 

 all minute as grains of sand, and often precisely alike in forir 

 color) and substance, will from one species, produce an exert 

 scence always of a globular form, like a grape or bullet ; anotht 

 ovate, or shaped like a bird's egg ; a third oval ; a fourth knobbe 

 and warty ; here with a smooth surface, there prickly j now so 

 and succulent, again hard and stony ; being thus so exactly marl 

 ed in every instance, as to enable the naturalist to tell with ce 

 tainty the particular species that will proceed from any particul; 

 gall that presents itself to him. Jehovah, quam ampla et m 

 randuj sunt tua opera ! 



FOREIGN SPECIES. 



Twenty-six different species of cecidomyia are enumerated \ 

 Mr. Stephens as occurring in Great Britain. Most of these, ar 

 others in addition to them, are found upon the continent. A sho 

 account of the habits of some of these cannot but be interesting 

 the general reader, and will be particularly valuable to the agi 

 culturist, as giving him a more enlarged acquaintance with a grou 

 some of which yearly inflict upon him such severe disasters, ar 

 all of which rank among those insects which are injurious toveg 

 tation. 



One of these species (C Jwiiperina,) infests the common juD 

 per of Europe, forming its galls at the tips of the twigs. The 

 galls are composed of six leaves, the three outer ones being large 

 and enveloping the three inner ones. Baron De Geer has studit 

 out and described the mode in which the galls come to be thusco 

 structed. He observes that the natural leaves of the juniper a 

 always placed in rows around the stem, each row being compos* 



