38 ' PROCEEDINGS OF THE NATIONAL MUSEUM vol. 68 



pared food, the lot was examined. Four were found with the anterior 

 end inside the body of the bug, entrance having been secured through 

 rents torn between the sclerites, the posterior third of the maggots were 

 exposed. 



In another experiment, maggots squeezed from the female were 

 placed on Leptoglossus nymphs artificially paralyzed, two maggots 

 to each of five nymphs. All of the maggots established themselves 

 but one. The nymphs were carefully examined the following day, 

 and showed no external evidence of the parasites, in this respect 

 differing from the two previous experiments. One was dissected 

 and both maggots, early in the second instar, were found wholly 

 within the body of the host, which was dead, but whose tissues had 

 as yet shown no signs of decay. On the following day, or when the 

 maggots were two days old, another nymph was dissected, and found 

 to contain both maggots, in the second instar, wholly concealed 

 within the body, apparently in excellent condition and feeding on the 

 body contents, now brown, semifluid, and in a moderately advanced 

 state of decay. On the following day, all the remaining nymphs 

 were dissected and the maggots were found to be dead, quite likely 

 because of the extensive desiccation of the food material. 



These experiments with the maggots of S. trilineata are too limited 

 to serve as a satisfactory basis for generalization, but certain points 

 are indicated which it may be allowable to express. First, it is 

 evident that this species is not a primary parasite of the wasps with 

 which it associates, nor yet is it a commensal in the ordinarily accepted 

 sense of that term. No term seems to exactly describe the relations 

 of these two forms. The maggot is at first a true parasite on the 

 living insects captured by the wasp, in the later stages becoming a 

 scavenger on their putrifying bodies, and incidentally it may assume 

 the role of predator on the young of the wasp for wliich the paralyzed 

 insects have been provided. 



SENOTAINIA RUFIVENTRIS (Coquillett) 



Hilarella rufiventris Coquillett, U. S. Bur. Ent., Tech. Ser., No. 7, p. 129 

 1897. Type from Holly Springs, Mississippi, located in National Museum. 



Eusenotainia rufiventris Townsend, Proc. Biol. Soc. Wash., vol. 26, p. 22, 

 1915. 



This species was without question incorrectly placed by Coquillett 

 in the genus Hilarella. Townsend recognized this and proposed a 

 new genus without describing it. The species possesses all the typical 

 characters of the riibriventris series of Senotainia from which it differs 

 slightly in possessing somewhat longer face and antennae. In the 

 writer's opinion these are not variations of generic significance, and 

 the close relationship with the ruhriventris series can best be recognized 

 by retaining it in the same genus. 



