510 
Katharine Foot and E. C. Strobell 
we are deeply indebted to Dr. Eltrixgham for bis very valuable dis- 
covery of the marked difference in the length of the intromittent organ 
of E. variolamis and E. servus. As a result of bis observations, we bave 
beeil able to follow out tbe inberitance of tbis second exclusively male 
cbaracter in tbe bylirids froni tbis cross, as -svell as froni tbe cross be- 
tween E. variolamis and E. ictericus. 
A full description of tbese results will be publisbed sbortly, in Con- 
nection witb Dr. Eltrixgham’s description of bis work oii the parent 
species". 
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