Sy Naty TSF p i re ee ee 
= EN Breas oe 
Maw pare yt, ee 
1884, ] 
mandibles, and the two setz, only with difficulty separable, to the 
maxilla of biting insects. He next considers the structure which 
Savigny regarded as the lingula, but to which most authors 
have applied Burmeister’s name of “ Wanzen-platte;” he himself 
proposes to speak of it as the pharynx, and describes it as being 
endowed with great elasticity, and as acting as a pump, which is 
set in action by the contraction of muscles attached to the body- 
wall, whereby the space in the walls in which they are inserted is 
eal „and a vacuum thereby formed. The structure and re- 
lations of these parts are entered into in great detail, but, says the 
Journal of the Royal Microscopical Society, a full abstract of the 
Paper would be impossible without a republication of the figures 
Entomology. 537 
+ 
to which constant reference is made. The essay should receive 
the careful study of students of the anatomy of insects. 
aa pb study,” and M. Macchiati promises a fuller inves- 
on ot this interesting discovery.—/ournal of the Royal Mi- 
mites’ DEVELOPMENT OF CECANTHUS NIVEUS AND ITS PARASITE, 
ELEAS.—This is an extended, thorough, and well illustrated me- 
ny hail embryology of the tree cricket, and its egg parasite, 
7, in whose memoirs it appears, under date of 
monde, , 1884, forming a brochure of 56 pages, with eight plates and 
low; cuts n the text. Mr. Ayers endeavors to establish the fol- 
pes in the embryology of CEcanthus: 
Ovarian port the ovum in a germarium rather than from an 
- The. ; : : 
of secretion SS of yolk formation by cell-degeneration instead 
: beire ne Occurrence of a primitive segmentation of the embryo 
i The “Ppearance of the permanent segments. : 
| pene of a pair of appendages (some of them rudi- 
body “!duous]) on each of the seventeen segments of the 
Sages origin of the dorsal vessel as a pairéd organ, the lateral 
Which fuse and give rise to a median tube in the same 
