- 
80 General Notes. [January, 
Transversely striped trachez never enter the fat-masses of Lu- 
ciola; it is only the smooth tracheal capillaries that pierce them, 
somewhat coarser than’those of the luminous organ, and retain- 
ing air in their lumen. The fine branches heré arise not ina 
racemose manner, but by a fascicle of two or more capillaries 
arising at a point, and running in complicated windings before 
they enter the fat masses. They were never seen to anasto- 
mose; the layer of matrix was very thin on the striped trachee, 
' but much thicker on the capillaries. Sometimes the ends of the 
capillaries lying on a cell of the matrix were free; between two 
capillaries the matrix often formed a thin web, and rarely the 
matrix was gathered into a globule terminating the capillary. 
Real tracheal end-cells were not seen. 
As to the physiology of the luminous organ, the seat of the 
luminosity is at the boundary between the tracheal cylinder 
and the parenchyme-matrix around it: this is the place where ` 
the capillaries begin and where the osmic acid is reduced by the 
illumination, where oxygen is consumed. [Here we have an ad- 
ditional argument for the doctrine that the oxygenation of the 
tissues depends not on a circulatory fluid around the trachee, 
but on the activity of the tracheal terminations.} The action of 
osmic acid at this part is an experimentum crucis, proving that at 
the bifurcation the plasma of the parenchyme coming to meet 
the fine tracheal capillaries, receives oxygen from them, and 
hence combustion arises where the chitin of the capillaries is 
very thin. — 
Emery holds that the use of the. light-producing power is not 
merely for attracting the rare females, but for frightening such 
nocturnal enemies as bats. Luciola on being crushed emits an 
unpleasant flavor, but its taste is not at all bitter—G. Macloskie. 
ENTOMOLOGICAL Notes.—A case of mimicry is noticed by C. 
_ M. Weed in the same number ; Tetracis lorata, a white geometrid 
moth was found adhering to the stamens of a flower of the may- 
apple, its head toward the center, the wings being easily mistaken 
for the petals; a second one was found in exactly the same posi- 
tion. . L. Ragonot, 12 quai de la Rapee, Paris, is working 
out the Phycidz and Galleride of the whole world, with a view 
_of monographing these groups, and desires American specimens; 
European microlepidoptera will be sent in return. At a recent 
meeting (July 2) of the London Entomological Society, Mr: C. 
O. Waterhouse exhibited various species of phytophagous beetles 
to show the extraordinary effect that exposure to light had pro- 
duced on their colors. Fiery red had turned to bright green, pale 
‘yellow to brown, blue to black, and green to purple. The speci- 
mens exhibited had been in the public galleries of the Bristol 
Museum for twenty-five years. In Zoologischer Anzeiger, July 
7, P. Pancirtius publishes a note on the development of the wings 
` in insects ; in the same journal for July 21, E. Korschelt begins 
