TELEPHORIJX®. 
Ins. 79 
physiology ; and general observations. The paper concludes with a short 
bibliography. The author suras up his principal conclusions as follows : — 
1. The so-called ‘‘ terminal cells of the tracheae,” discovered by 
Schultze, which become black on the application of osmic acid, are not 
the actual terminations of the respiratory tubes. The latter branch in 
their interior into much finer capillaries, not provided with spiral chitin, 
which are very long, covered b 3 r peritoneal membrane, and thickly 
scattered through the luminous substance. 
2. Tlioso tracheal capillaries rarely form blind terminations in the 
luminous organs, but generally anastomose with one another, forming a 
kind of irregular net. 
3. These structures do not penetrate the cells of the parenchyma, but 
wind irregularly round their outer surface. 
4. The terminal cells of the tracheee are only the expanded peritoneal 
layer at the base of the tracheal capillaries, which issue in pencils from a 
trachea provided with chitinous spirals ; their peripheral extensions con- 
nect the latter with the capillaries. This is to be regarded as homologous 
with certain embryonic conditions of the tracheal system. 
5. The “ terminal ends of the tracheas ” are not the seat of light, or 
the point from which it proceeds. If it first appears in their neighbour- 
hood, it is only because these structures have storod up gas by their affinity 
with acid, and give it out in greater quantity at their neighbouring paren- 
chym cells. 
6. The light-producing property is inherent in the parenchym cells of 
the light-producing organs. It is produced by the slow oxidation of a 
substance formed under the influence of the nervous system. 
7. The parenchym cells, of which the two layers enveloping the ventral 
light-producing organs consist, are perfectly similar in their morphologi- 
cal peculiarities (size, form, and relationship to the tracheae and nerves). 
The difference between them consists only in the chemical properties of 
their contents. 
8. All (?) the parenchym cells are bound together by the fine branching 
terminations of nerves. 
9. The luminous organs are morphologically identical with the fatty 
bodies. 
Lampyris noctiluca. Note on habits; it is luminous in all stages; 
the emission of its light is voluntary : Laboulbene, Ann. Soc. Ent. Fr. 
(6) ii. p. 316. Spectrum of light; Conroy & Spiller, Nature, xxvi. 
pp. 319 & 343. 
Colour of the light emitted by Photuris pennsylvanica and Photinus 
pyralis ; Turner, Psyche, iii. p. 309. 
Vesta surnatrensis , sp. n., Gorham, Notes Lcyd. Mus. iv. p. 102, and 
Midden-Sumatra, Col. p. 67, Sumatra. 
Lampyris brutia, sp. n.. Costa, Atti Acc. Nap. ix. (6) p. 34, fig. 4, 
Calabria. 
Diaphanes fuscipennis , sp. n., Gorham, ll. cc. pp. 103 & 69, Sumatra. 
Luciola cerea and picea , spp. nn., id. ll. cc. pp. 103, 104, & 70, 71, 
Sumatra. 
