Vol. XXXl] ENTOMOLOGICAL NEWS I7I 



have never been found by the writer on a single individual 

 of this species. It is more than probable that in such cases 

 of double infestation one or both of the guests must perish, 

 since it would be manifestly impossible for one small jassid 

 to afford nourishment sufficient to carry two equally rapacious 

 larvae to maturity. The survival of one larva in such a 

 case would perhaps account satisfactorily for the disappear- 

 ance of the other. 



The dryinid sac referred to throughout this paper is rather 

 short oval in form, is usually quite symmetrical and when 

 mature measures about one millimeter in its major axis, the 

 minor axis a trifle less. It is light brown in color and is 

 barred transversely by several, three to five, narrow bands of 

 darker brown that give it the appearance of having true seg- 

 ments. It has a dull surface, finely rugulose, projects from 

 behind the second, third or fourth abdominal segment and is 

 found most often on the left side of the abdomen although 

 they occur on either side. 



Adult G. ombrodes have been both reared and taken with a net. 

 Only a few have been captured in the open and these on lawns 

 where parasitized jassids abounded. It is probable that 

 their activity and watchfulness would ordinarily forbid cap- 

 ture in the open, since they would naturally escape by falling 

 to the ground on any sign of disturbance such as would be 

 produced by the approach of a sweep net. Males are very 

 uncommon and the females must outnumber them at least ten 

 to one, judging from rearing results obtained by the writer. 



It has been learned during these studies that in every case 

 it appears to be the female jassids that fall victims to the 

 attacks of the ombrodes. This may be due in some measure 

 to the superior agility of the male jassids in eluding the 

 spring of the parasite or because the females, being generally 

 larger, are preferred as hosts because more likely to success- 

 fully nourish the young larvae. Nymphs so far as known 

 are free from attack, since only adult females have been 

 taken carrying the sacs. 



These parasites are rare during the early summer and only 

 begin to multiply towards autumn. They are seldom seen 



