# x1
 location:  1-.
 origin:  Induced by ethyl methanesulfonate.
 references:  Pak, Grossfield, and White, 1969, Nature (London)
    222: 351-54.
 phenotype:  Nonphototactic mutant showing ERG more or less like
   wild type, although reduced in amplitude and with somewhat
   different wave form. Other abnormalities include fused wing
   veins, undeveloped ocelli, and forked bristles.
# x2, x3, x4, x5, x6
 location:  1-.
 origin:  Induced by ethyl methanesulfonate.
 references:  Pak, Grossfield, and White, 1969, Nature (London)
    222: 351-54.
 phenotype:  Nonphototactic mutants; external morphology wild
   type.
# x7:  see tan
# x8
 location:  1-.
 origin:  Induced by ethyl methanesulfonate.
 references:  Pak, Grossfield, and Arnold, Nature (London) 227:
    518-20.
 phenotype:  Nonphototactic mutant with normal ERG. Abnormalities
   include reduced ocelli, fused wing veins, and forked bristles.
# x10
 location:  1-.
 origin:  Induced by ethyl methanesulfonate.
 references:  Pak, Grossfield, and Arnold, Nature (London) 227:
    518-20.
 phenotype:  Nonphototactic   mutant   with   normal   ERG.

   Resembles sc in absence of some scutellar, ocellar, and other
   bristles.
# x12:  see norpA
# x13:  see norpA
# x14:  see nonA
# x16:  see norpA
# x24:  see norpA
# x28:  see slrp
# x35:  see rdgA
# x36:  see rdgB
# Xa:  see apXa
# Xhabo:  see ABO
# Xhcr+:  see CR
# XI-2:  see dlg17
# xvt:  see pyd
# xwh: extra wing hairs
 location:  3-45.
 discoverer:  Poodrey, 1979.
 references:  Poodrey, 1980, The Genetics and Biology of Droso-
    phila (Ashburner and Wright, eds.). Academic Press, London,
    New York, San Francisco, Vol. 2d, pp. 443-97.
 phenotype:  Causes the production of multiple trichomes per cell
   on the wing and elsewhere on the body; resembles mwh although
   expression of xwh on the surface of the wing is less uniform.
   Arista has many extra branches.