446 ANNA R. WHITING. 



color. The dominant daughters have so far given only dominant 

 offspring. 



MORPHOLOGICAL ABNORMALITIES IN BIPARENTAL MALES AND 



THEIR DAUGHTERS. 



Physical defects are rather common in biparental males and 

 their daughters. These include abnormal sclerites in abdomen, 

 defects in antennae, abnormal legs, incomplete digestive tract, ab- 

 normal thorax, and genitalia. Among the 790 biparental males 

 were found 41 or 5.19 0.53 per cent, abnormal. Also there 

 were 61 individuals that did not spin cocoons (called naked pupse) 

 7.72 it 0.64 per cent. This stands in contrast to conditions in 

 impaternate males where there were but 24 abnormal and 83 naked 

 pupse among 17,111 normal, 0.14 0.02 per cent, and 0.48 0.04 

 per cent, respectively. Among the 13,430 sisters of biparental 

 males there were 82 abnormal and 57 naked pupse, 0.61 0.04 

 and 0.42 0.04 per cent, respectively. 



In the daughters of biparental males abnormalities are often 

 more extreme and present in a much higher percentage. 68 freaks 

 and 23 naked pupse appeared in addition to 95 normal. Percent- 

 age of freaks is 36.56 2.38, of naked pupse 12.36 1.63. 

 Brothers of these females showed 13 freaks and 2 naked pupse to 

 5,914 normal, 0.22 0.04 and 0.03 0.02 per cents. 



SUMMARY. 



1. Four allelomorphs affecting eye color and three pairs of 

 allelomorphs affecting wing form and venation, none linked, are 

 studied from the point of view of the method of their inheritance 

 by biparental males in Habrobracon juglandis (Ashmead). 



2. A female homozygous for one or more recessive factors 

 when crossed to a male carrying allelomorphs to these factors 

 produces, in addition to recessive haploid sons and dominant dip- 

 loid daughters, sons which have all dominant characters like their 

 sisters. 



3. In crosses where females are homozygous for some recessive 

 and some dominant factors and males possess allelomorphs the 

 biparental sons are entirely dominant, showing that they have some 

 factors from each parent. 



