ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
595 
finally the males and females. It is also noted that Lasius flavus Fab. 
sometimes takes the eggs in charge, and that the Aphis contains a 
Nematode parasite. 
Mouth-parts of Collembola.* * * § — Mr. J. W. Folsom has brought to a 
successful conclusion a difficult and much-needed piece of work, — an 
analysis of the mouth-parts of the Collembolan Orcliesella Jlavopicta 
Pack., synonymous with 0. cincta L. of Europe. He describes mouth, 
pharynx, oesophagus, tentorium, labrum, mandibles, maxillm, palpi, 
glossa and paraglossa, labium, aud cephalic glands. The musculature 
of the parts is carefully discussed. Mr. Folsom then traces the history 
of the food until the stomach is reached, giving an account — necessarily 
inferential — of the physiology of the mouth-parts, to which scarcely any 
attention has hitherto been paid. 
Regeneration in Orthoptera.f — M. Edmond Bordage continues to 
substantiate the adaptive character of regeneration. In saltatorial 
Orthoptera, it is not possible to provoke autotomy of the first two pairs 
of legs. By force they may be broken across the trochanter-coxa 
articulation, or more rarely across the femur-trochanter articulation. It 
is strange, however, that if regeneration takes place at all, it is most 
frequent and most complete when the breakage was across the femur- 
trochanter joint, i.e. where it most rarely occurs. 
The explanation offered is that in natural exuvial autotomy the 
rupture is most frequent and least dangerous across the femur-trochanter 
joint. 
He further notes that any appendage may suffer loss in moulting ; 
that the tarsus is most readily injured and most readily regenerated ; that 
in Phylloptera laurifolia and Conocephalus differ ens the regenerated tar- 
sus is tetrameral (normal in Locustidae), that in Gryllus campestris the 
regenerated tarsus has three joints ; and that the regenerated anterior 
limbs of Locustidae aud Gryllidae have no tympanic apparatus. 
Corpora allata of Bacillus.f — Dr. R. Heymons has studied two 
peculiar vesicles which are seen if one opens the head of Bacillus rossii F. 
(a European stick-insect) from the dorsal side and examines the poste- 
rior half close to the gullet. They may be recognised by their milk- 
white colour ; and even with a lens it may be seen that they are closely 
connected with the pharyngeal ganglion. They arise from ectodermic 
ingrowths, at first apparently solid, and they are neither ganglionic nor 
glandular. Similar bodies, which the author calls by the indifferent 
name “ corpora allata,” occur in other Orthoptera, in Dermaptera, 
Hymenoptera, Rhynchota, and Lepidoptera ; but what distinguishes 
those of Bacillus is the presence in a vesicular cavity of a central 
chitinous sphere surrounded by successive lamellae of chitin. Their 
function remains quite obscure, but it is possible that they have some- 
thing to do with the visceral nervous system. 
Eumasticides.§ — Mr. M. Burr uses this new name for a tribe of 
Acridiodea — of which he gives a systematic account. There is particu- 
* Bull. Mus. Comp. Zool., xxxv. (1899) pp. 7-39 (4 pis.), 
t Comptes Rendus, cxxix. (1899) pp. 169-71. 
j SB. K. Prenss. Akad. Wiss., 189.*, pp. 563-75 (2 figs.). 
§ Ann. and Mag. Nat. Hist., viii. (1899) pp. 75-112 (plates to follow).’ 
