INTRODUCTION. 
Ins. 3 
INTRODUCTION. 
The year 1901 again showed an increase in the amount of entomological 
literature. The number of titles in the Record being 1525 as contrasted 
with 1431 in the year 1900. 
Several important systematic works have appeared; among them are 
the eighth Yol. of the Romanoff series on Lepidoptera, it concludes the 
work of the late M. Ragoxot (1104) on the Phycitince and Galleriince and 
has been completed and prepared for press by Sir George Hampson. 
The 3rd Yol. of the British Museum Catalogue of moths has also ap¬ 
peared; Hampson (592). Mr Theobald’s work on mosquitoes (1358) 
almost inclines the entomologist to wish that some of the other neglected 
groups of Insects may be suspected of malarial practices, as then we 
might hope that something would be done by Society to repair the great 
indifference with which this department of Nature is treated. 
Kolbe (774) has favoured us with suggestions for a new classification 
of Coleoptera, that differs very widely from that propounded last year by 
Prof. Lameere. Peringuey has published (1014) the Lamellicorn division 
of the projected descriptive catalogue of the Coleoptera of S. Africa. 
To Darboux & Houard (324) we are indebted for a useful catalogue of 
galls. 
In morphology IaadiO (699) gives us a study of the labium in a certain 
number of forms of Coleoptera , and Leon (832) has treated of the same 
part in Hemiptera. The remarkable structures in connection with the 
respiration of Dipterous larvae have received considerable attention. 
Enderlein (412, 413) adds to his remarks on them some suggestions as 
to the physiology of respiration; his papers deal with the spiracles 
of Oestridae in which group the specialisation of these structures is carried 
to its extreme. Pantel (1002) has made some novel and interesting 
suggestions on the same subject, and it is also treated of by Muggenburg 
(952). 
Guenther’s memoir (589) treats of the finer anatomy of the wings of 
Lepidoptera. He ranks them as sense-organs much more highly than 
others have done; indeed he evidently inclines to the opinion that every 
scale may be innervated, in addition to the more specialised sense-organs 
he describes. De Meijere treats of the terminal parts of the feet (906). 
Lecaillon besides his important paper (823) on the ovary in Collembola , 
has given us a series of short papers on the ovaries. Janet’s treatise 
(686) on the sting of Myrmica is a concise and valuable account of a 
difficult piece of anatomical work. The same author’s morphological 
paper (687) on the head, is a most brilliant contribution, even though the 
hypothesis it is intended to support may prove to be untenable. Hesse’s 
papers (619, 620) on ocelli will be found very useful. Meinert’s account 
(909) of the larvae of Dytiscidee considerably extends our knowledge. 
Tannreuther (1352) has been able to give particulars of the occurrence of 
supernumerary wings in the prepupa of Pieris. Tornier (1373) has 
recorded his experiments as to the regeneration of wings and legs in 
Coleoptera. Borner’s work on Centr. European Collembola is accompanied 
by a new classification of the Order (137). 
Dickel’s papers (336-339) on the development of the bee in the egg and 
the determination of sex and caste deserve close attention. Reh’s discussion 
of the metamorphosis of Coccidce (1111) is accompanied by considerations 
as to complete and incomplete metamorphosis, and attempts to define the 
terms, larva, pupa, nymph. Zander (1504) deals with the development 
and morphology of the male structures of Trichoptera. Anglas (25) makes 
an important contribution to the great subject of metamorphosis, and 
