4 Ins. . 
INSECTA. 
[Dewitz, H.] Wie ist es den Stubenfliegen und vielen auderen Insecten 
mogiich, an senkrechten Glaswanden emporzulaufen ? SB. nat. Fr. 
1882, pp. 5-7. 
The author’s observations confirm the opinion that the power of flies 
and other Insects to walk on perpendicular glass is due to a transparent 
adhesive secretion on the hairs surrounding the pulvillae. 
. Mittheilung fiber den Kletter-apparat der Insekten. L. c. 
pp. 109-113. 
In this second paper, the structure of the glands, &c., which communi- 
cate with the hairs, is briefly described, chiefly as observed in various 
Coleoptera. There is au abstract of both papers in Ent. Nachr. viii. 
pp. 51-53 & 247-250. 
Duncan, P. M. Cassell’s Natural History, Vol. vi. London: 1882, 4to, 
woodcuts. ' 
The conclusion of vol. vi., published in 1882, contains the following 
entomological matter by W. S. Dallas : Chap. xii. Diptera and Aphani- 
ptera (conclusion), pp. 73-101 ; chap. xiii. Rhynchota , pp. 101-118; 
chap. xiv. Orihoptera , pp. 118-149. The classes Myriopoda (pp. 150-157) 
and Arachnida (pp. 158-188) are likewise discussed by the same author ; 
and Crustacea (pp- 189-220) by H. Woodward, with concluding remarks 
on Arthropoda (pp. 221-223) by Dallas & Woodward. 
Frenzel, J. Ueber Bau und Thiitigkeit des Verdauungskanals der 
Larve des Tenebrio molitor und Berficksichtigung anderer Arthro- 
poden. B. E. Z. xxvi. pp. 267-316, pi. v. and figs. [Preliminary 
abstract, Zool. Anz. v. pp. 215-217.] 
This paper treats of the microscopical examination of the intestinal 
parts in fresh specimens, and especially the structure and analysis of the 
crystalloid nucleus ; on the examination of transverse sections, and the 
general physiology of the digestive secretion, and its action ; and the 
questions of reabsorption and a gall-like secretion. The author’s results 
are summed up as follows: — (1) The first portion of the intestine in 
Tenebrio molitor (larva) serves only as a canal, and possesses no special 
secretion. (2) The middle portion has no chitinous or other cuticle, but 
the epithelial cells are fringed with fine hairs. (3) The epithelium of the 
middle intestine secretes the digestive fluid, but does not reduce osmic 
acid. (4) Every nucleus of the principal cells of the epithelium of the 
middle intestine normally contains a crystal-like quadrangular (rhom- 
boid) or hexagonal plate. (5) T. molitor (larva) possesses two distinct 
digestive fluids, a tryptic and a diastatic, and is adapted for a diet com- 
posed of albumen and carbonic hydrate. (6) Phosphorus and magnesium 
are both contained in the digestive secretion of insects. Both substances 
are probably set free by decomposition of the cells, and form with 
ammonia crystals of phosphate of ammonia and magnesia. (7) It is not 
unlikely that a reabsorption takes place in the middle intestine of insects. 
(8) The terminal intestine of insects serves as an excretory organ for 
undigested food, and has no special secretion. (9) A reabsorption in the 
