Ferry, Lancefield and Metz: Mutations in Drosophila 379 



Blun+ 



Tardigrade 



MUTANT CHARACTERS OF HEAD, SCUTELLUM AND WINGS 



Figure 19. In tardigrade flies, four of the tarsi (last five joints of the leg) are missing. 

 (See Figure 20, where this is shown in connection with another character.) The anterior 

 cross vein is missing and the fourth and fifth veins are connected by an extra cross vein at 

 the base. In bald, some of the bristles are missing from the head and from other parts of 

 the body. This is a sex-linked character. In blunt the scutellum is cut off squarely instead 

 of being rounded at the posterior end, and some of the bristles are absent. 



duller red than that of the wild-type 

 fly and the conspicuous dark fleck of 

 the latter is absent or faint. 



Orif/iii. — ( RloOl ) . Many males 

 were obtained from a mating of bald 

 bv scute rough stump. This character 

 had apparently been in scute rough 

 stump stock, but had not been detected 

 owing to the presence of rough. 



Comparison. — Red might be com- 

 pared with various dark eye colors of 

 other species, but in the absence of 

 associated characters there is little evi- 



dence to indicate homology with any 

 of these. 



Balloon (bo). 

 Figure 17, No. 12 



Description. — In balloon, the wings 

 have a network of extra veins between 

 the second and third, and the fourth 

 and fifth veins. There is also an extra 

 vein between the second and the mar- 

 ginal vein and sometimes the second 

 and the third veins are fused to- 

 gether instead of having the anterior 

 cross-vein present. There is usually a 

 broken bubble present in the network 



