382 



The Journal of Heredity 



O/'/V/m.— (W1256, L374). Thirty- 

 two males and females were found in 

 an Fi pair mating involving approxi- 

 mated. 



Combined (co). 

 Figure 20 



Description. — The anterior dorso- 

 central liristles are missing; the groove 

 between the thorax and scutellum is 

 generally gone ; and the tarsi are com- 

 pletely absent except for the segment 

 to which the claw is joined. The fly 

 breeds very poorly so that stock must 

 be kept by using heterozygous flies. 



Origin. — (W276). Two males were 

 found in a mass culture. 



Glossy (g). 



Description. — The eye is very shiny 

 as though varnished and has a black 

 horizontal streak running through the 

 center. The facets of the eye are ir- 

 regular and more or less run together, 

 giving the eye a roughened appearance. 

 The flies have poor viability. 



Origin. — (W716). Several males 

 and females were found in a mating of 

 blunt approximated by blunt spread. 



Incomplete (ic). 

 Figure 18, No. 14 



Description. — In flies of this race 

 both cross-veins are missing, or prac- 

 tically so, although a piece of either 

 one or both may be present. 



Origin. — (W3()?9). Several males 

 were founfl in forked-2 stock. 



Blistered (hi). 

 Figure 18, No. 16 



Description. — The eyes of blistered 

 flies are lens-shaped and the facets are 

 irregular and are sometimes yellow, so 

 that the whole eye has a blistered ap- 

 pearance. One or more of the dorso- 

 central and scutellar bristles may be 

 missing ; the wings have a .shiny and 

 roughened appearance due to the irreg- 

 ularity of the hairs on the wing (Fig. 

 IS) ; the veins are somewhat thickened 

 and the costal hairs are also slightly 

 irregular. The flies have poor viabil- 

 ity. 



Origin.— (\WU3d). A blistered 

 stump female was found in the stock 

 of forked rough stump. 



Rounded (rd). 

 Figure 18, No. 15 



Description. — The wings in this race 

 are shorter and broader than normal, 

 thus giving them a rounded appearance. 

 The anterior cross-vein is usually miss- 

 ing. When it is present, the two cross- 

 veins are nearer together than normal, 

 due to the shortening of the wing. 

 Both anterior and posterior cross-veins 

 may be lacking, in which case the wing 

 is shorter than the abdomen and is 

 curled up from the body. The origin 

 of the veins is often indistinct. 



Origin. — (R390). Many males and 

 females were found in a heterozygous 

 stock carrying combined. 



Absent (as). 

 Figure 18, No. 13 



Description. — In this mutant race 

 the posterior cross-vein is uniformly 

 absent and the anterior one may be 

 gone, although it is usually present. 

 The bristles on the thorax and scutel- 

 him are often curly, and sometimes a 

 few of the tarsi of the hind legs are 

 swollen. 



Origin. — (R1119). Three males 

 were found in rough scalloped stock. 



Granulated (gr). 

 Figure 17, No. 11 



Description. — The wings are very 

 shiny, but with blotchy coloring. The 

 veins are thickened irregularly. Some 

 of the bristles, usually the anterior 

 dorso-centrals, are missing from the 

 thorax, and occasionally one of the 

 scutellars is gone. In extreme cases, 

 one or all of the bristles and hairs are 

 gone from the head. Also the wings 

 are smaller than normal and the eyes 

 may be slightly roughened. The flies 

 have poor viability. 



Origin. — (R1953). Two males and 

 one female were found in the second 

 generation of a mating of blunt spread 

 by ragged. 



