INFLUENCE OF AGE OF MOTHER. 373 



abdomen of a deficient female (Freak 6). Great reduction and 

 fusion of parts posteriorly, especially of gonapophyses, is to be 

 noted. Sections show large eggs and nurse cells developing, but 

 no trace of poison apparatus; deficiency therefore extended 

 internally to posterior organs. 



Reduction in the posterior part of the digestive tract also 

 occurs. This may be indicated by a swollen appearance of the 

 abdomen with an abnormally dark color, due to failure of 

 elimination of fecal matter. Sections show different degrees of 

 defect ranging from an apparent failure of the proctenteron to 

 connect with the mid-gut, to a complete disappearance of the 

 former and considerable reduction of the latter posteriorly. 

 This reduction may shorten the Malpighian tubules until they 

 are little knobs on the posterior end of the mid-gut sack, or the 

 latter may be rounded off smoothly. Fig. F shows a specimen of 

 this type from a female (Freak 21) with no external genitalia. 

 There were no hind-gut, no Malpighian tubules, no poison 

 apparatus. In the ovaries nurse cells were present but ova were 

 small. The posterior compound nerve ganglion was normal. 



Fig. G is from a male (Freak 20) with no external genitalia, and 

 no hind-gut posterior to the Malpighian tubules which are short 

 and thick. The mid-gut is much swollen with fecal matter. 

 Testes were present, rilled with mature sperm but there were no 

 vasa deferentia. The posterior compound nerve ganglion was 

 separated into its three elements. 



RARE OCCURRENCE OF ABNORMALITIES IN NORMAL STOCKS. 



Among 53,148 males and 16,036 females of normal stocks the 

 following abnormalities in antennae, genitalia, and digestive tract 

 have appeared. 



Only twelve females had abnormal gonapophyses. 



Abnormal antennae were recorded in only thirty males and 

 twenty-six females. These may be classified as having one or 

 more antennae short, sixteen; absent, twenty-eight; clubbed, 

 one; branched, three; and unclassified, eight. Two of those 

 having short antennae were males with deficient genitalia. 



Association between deficiency in genitalia and digestive tract 

 is much closer. Males deficient in genitalia alone were twenty- 



