216 



[September, 



vessel so tliat the larvas could crawl out and drop into the sand to pupate. 

 The whole was placed in the snn, and the water soon evaporated down to about 

 one-third its original amount. The vessel was then replenished with rain 

 water ; this was done some two or three times, and in spite of the sudden and 

 great variations in salinity, the larvae prospered well, pupated, and emerged 

 about July 20th. — C. G. Lamb, Zoological Laboratory, Cambridge : Aug., 1911. 



A case of antennal teratology in the Diptera. — Among several specimens of 

 Ptilonota guttata, Mg. (Ortalidx), which were taken at Tatsfield, Surrey, at 

 the end of last May, one exhibited a remarkable teratology of one antenna. 

 This is shown in the figures, and it will be seen that there is an extra tliird joint 

 which apparently consists of two fused together, and two complete additional 

 aristas. The upper figure sho-\vs the head with the two antenna, the lower 



figure is an enlarged view of the left antenna seen from above. A is the normal 

 arista, B and C the accessory ones. U is the accessory fused third joint ; its 

 double nature is evident from the fact that, when viewed perpendicularly to 

 the tip, the latter is seen to be deeply sulcate in the plane of the joint. The 

 demarcation between the normal third joint H and the accessory one G, is not 

 quite so definite as shown in the figure, except in the particular view figured. 



The accessory aristas are complete and well formed, but are a little smaller 

 than the normal one as shown in the lower figure ; the parts indicated by D and 

 E in that figure are both portions of the normal third joint, biit owing to a well 

 marked convexity in the side of that joint, a distinct line of demarcation is 

 visible on viewing the antenna in tlie direction in wliich the view is drawn. 



