1913] Proceedings of the Cleveland Meeting 131 



Comparing the work done by H. Garman on Limothrips cerealium, 

 a species of Terebrantia, with the work done by Muir and Kershaw, on 

 a species of Tubulifera, a difference in interpretation exists as to whether 

 the asymmetrical parts are mandibles or maxillag. Muir and Kershaw 

 interpret the asymmetrical parts as maxillse. Observations made by the 

 writer on two species of Tubulifera verify their position in general. 

 The writer expects to continue his observations on species of the sub- 

 order Terebrantia to determine if possible whether the interpretation 

 of H. Garman is correct or not. 



Discussion: R. A. Cooley — It was asked as to whether any 

 evidence of glandular secretion from the mouth was found, 

 which being answered in the negative, it was stated that in a 

 species feeding on terminals of currant and gooseberry we have 

 noticed a considerable distortion of the leaves and stem, sug- 

 geting the possibility of a secretion introduced while feeding. 



J. E. Wodsedalek, University of Wisconsin: Life History 

 and Habits of Trogoderma tarsale, a Museum Pest. Read 

 by Title. 



Leonard Haseman, University of Missouri: Life Cycle and 

 Development of the Tarnished Plant Bug, Lygus pratensis Lin. 

 Presented by the Secretary. 



Owing to the very serious injury to peach and pear in the early 

 spring which seemed to be due to the work of the tarnished plant-bug, 

 the writer has undertaken a careftil study of the life cycle, habits and 

 development of this insect. The work has been carried through the 

 late summer and fall months and will be continued throughout the 

 following spring and siimmer. 



In this work it has been found that the tarnished plant-bug breeds 

 largely upon various flowering weeds such as wild asters, daisies, and 

 mare's tail {Erigeron canadensis). The tarnished plant-bug deposits 

 its eggs in the blossoms of the host plant and not in the tissue of the 

 leaves or stems. These eggs hatch in from five to seven days and the 

 insect passes through five distinct nymphal stages in its development 

 in the place of four, as other writers have maintained. The insect 

 remains in each nymphal stage for about the same length of time and 

 completes its growth in from thirty to thirty-five days. 



Discussion: P. J. Parrott — There occurs in New York a 

 species (Lygus invitus) Say which is during some seasons quite 

 destructive to pears. In feeding on the fruit, the epidermis is 

 ruptured by the proboscis and protruding granular areas form 

 about the wounds. This species closely resembles pratensis and 

 is easily confused with it. In order to establish distinguishing 

 characters we have bred the two insects through their various 

 life stages. Both species have five nymphal instars and can 



