THE GENETICS OF HABROBRACON JUGLANDIS ASHMEAD 



CONFLUENT, cf (wings). This is a mutation af- 

 fecting wing veins and antennal segments. It 

 was found on August 2, 1930, in a male with 

 shortened wings showing fusion between first 

 and third branches of radius veins at their ex- 

 tremities. There is more or less fusion and 

 deficiency of segments distally in the anten- 

 nae. Degree of abnormality in wings is corre- 

 lated with that of antennae. At slightly in- 

 creased temperature many confluents die in co- 

 coons, and at lower temperature confluent over- 

 laps with wild-type. Females are fully fertile 

 and males are of normal viability. (Discarded) 



TRUNCATE, tr (wings). This mutation was found 

 on August 7, 1Q30, in the offspring of an X- 

 rayed female (dosage about 2600 R units). One 

 of the male progeny had primary wings much 

 shortened distally tending to cause coalescence 

 of the first and third radius veins. Truncate 

 is very irregular in appearance, apparently 

 having a considerable overlap into type. Ter- 

 minal antennal segments are very likely to be 

 more or less fused, and v/ings are often but 

 slightly affected. The variation suggests con- 

 fluent in certain respects, but in combination 

 with reduced it is more easily recognized. 

 Both sexes are fertile with normal viability. 

 (Discarded) 



UNEXPANDED, un (wings). This first appeared in 

 the progeny of a type female by a wild-type 

 male in August, 1930. Wasps with this mutant 

 trait have primary and secondary wings unex- 

 panded. This character was carried for several 

 generations, but the wasps were highly invia- 



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