ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



265 



galleries of the larvae show horizontal, vertical, exit and pupal portions. 

 Locomotion is secured through the use of well-developed dorsal and 

 ventral ambulatory ampullae. By far the greater proportion of the 



Typical larval gallery of Saperda carcharias. 



a, horizontal or initial portion in outer sapwood ; b, vertical portion in 

 wood ; c, exit hole ; d, pupal portion. 



wood is passed behind into the gallery and not swallow^ed. AYhen there 

 are many larvse there is cannibalism. The larva is parasitized by an 

 Ichneumonid larva. J. A. T. 



Variability in Coloration of Elytra. — Gr. Teodoro {BuM. Soc. 

 Entomol. Ital., 1919, 51, 44-8). A brief discussion of changes in 

 colouring, distinguishing pigmentary and structural coloration, cuticular 

 and hypodermic colouring, colour due to waste-products and those 

 induced by ferments from the hypodermis. The coloration is influenced 

 by food, illumination, temperature, humidity, climate and sex. Nicolet 

 called attention to the movement of large corpuscles in the blood 

 circulating in the lacunae of the elytra, and an examination of this is 

 promised. J. A. T. 



Spermatogenesis in a Fly. — Chaeles W. Metz and Jose F. 

 NoxiDEZ {Jourii. Exi^er. Zool., 1921, 32, 165-85, 2 pis,). The sperma- 

 togonial chromosomes in Asilus sericeiis are ten, in five pairs. The 

 sex chromosomes have not been identified. In the last spermatogonial 

 anaphase, as in preceding anaphases, the chromosomes go to the poles 



