1913] Proceedings of the Clevelajtd Meeting 151 



On motion, the report was ordered accepted and printed, 

 and the committee continued for another year. 



The following papers were then read : 



Edith M. Patch and William C. Woods, Maine Agricultural 

 Experiment Station: ' A Study in Antennal Variation. Read 

 by title. 



Alex. D. MacGillivray, University of Illinois: Propharynx 

 and Hypopharynx. 



The pharynx after entering the occipital foramen makes a distinct 

 bend toward the mouth. In the region of the clypeus, it divides trans- 

 versely, one-half passes to the clypeo-labral side, the other half to the 

 labial side of the mouth, while folds extend along each lateral margin 

 and unite with the mandibles and maxillae. The name of propharynx 

 is proposed for the portion lying adjacent to the clypeo-labral part of 

 the mouth and hypopharynx is vised for the portion lining the labial 

 portion. The propharynx consists of three parts: frontal lobe, ei^iphar- 

 ynx, and fulcrum. The frontal lobe is usually wanting in sucking 

 insects, the cpipharynx is modified into a tongue or piercing organ and 

 the fulcrum into a cuticular supporting plate. In the muscids the 

 epipharynx and fulcrum are located outside of the mouth, the proximal 

 end of the fulcrum is attached to the distal margin of the labrum. The 

 hyi^opharynx also consists of there parts; lingua, superlingua, and 

 pharyngeal sclerites. 



F. L. Washburn, State Entomologist, Minnesota: A few 

 Experiments in Photographing Living Insects. 



Thomas J. Headlee, New Jersey Agricultural Experiment 

 Station: Some Facts Regarding the Influence of Temperature 

 and Moisture changes on the Rate of Insect Metabolism. 



While connected with the Kansas State Experiment Station at 

 Manhattan, the writer found by subjection of different groups of the 

 Southern Grain Louse {To.voptera graminum Rodani) to various constant 

 temperatures under constant atmospheric moisture conditions and other 

 groups to various constant percentages of relative humidity under 

 constant temperature conditions: (1) that the rate of increase in 

 metabolism for each 10°F. increase in temperature, starting at 58°F., 

 decreases as the optimum temperature is approached, and that while 

 the metabolism of degeneration becomes more rapid after the optimimi 

 is passed the rate of growth is retarded; (2) that a variation of from 60 

 to 62% in atmospheric moisture does not effect the rate of metabolism 

 when the creatures have an abundant supply of succulent food. 



Similar tests of the effect of temperature on the rate of metabolism 

 in Lysiphlehiis tritici Ashm, and of the effect of teniperature and mois- 

 ture on the rate of metaboli-sm of the Chinch Bug {Blissus leucopterus 

 Say) infected and uninfected by the chinch-bug fungus {Sporotrichum 

 globuliferum Speg.) gave similar results. 



