380 



The Journal of Heredity 



NORMAL AND VARIANT LEGS 



Figure 20. Above are shown the front, middle, and hind legs from the right 

 side of a normal fly. Below are shown the legs of a mutant from called combined, 

 in which four of the tarsi are absent, the one to which the claw is attached being 

 all that is left. This fly looks about as peculiar as would a man if his hands were 

 attached at the elbows and his feet at the knees. Other deformities also characterize 

 the mutation. 



of extra veins between tlie fourth and 

 fifth veins. Generally the texture of 

 the wing is heavy and muddy in ap- 

 pearance. 



Origin. — (RlTOTj. Several males 

 and females were found in rough scal- 

 loped stock. 



Comparison. — Balloon agrees closelv 

 with the description of Ijalloon in D. 

 mclanogastcr given l)y Bridges and 

 Morgan,'' ])ut the stocks have not as yet 

 been compared. 



Third Chromosome Characters 



Tardigrade {id). 

 Figure 19 



Description. — Four tarsi are gone in 

 tardigrade just as in combined. The 

 anterior cross-vein is usually missing, 

 and the fourth and fifth veins are 

 fused or connected by an extra cross- 

 vein at the base. Tardigrade flies had 

 ])oor viabiHty and were very hard to 

 breed, hence the stock was discarded. 



