ILLUSTRATIONS. 



PLATES. 



Page. 



Plate I. Different stages of Calosoma sycophanta Frontispiece. 



II. Out-door insectaries "A" and "B" for beetle rearing 20 



III. Interior view of insectary "A" (PI. II) 20 



IV. Interior view of insectary "B" (PI. II) 20 



V. Box cages used for rearing beetle larvae late in the summer 24 



VI . Larvae of • Calosoma sycophanta feeding on gipsy moth caterpillars 



under burlap, at Pine Banks Park, Maiden, Mass., 1910 32 



VII. Gipsy moth pupae that have been destroyed by the larvae of Calosoma 



sycophanta 36 



VIII. Assembling cage in a pine tree 60 



IX. Map of eastern Massachusetts, showing dispersion of Calosoma syco- 

 phanta 80 



TEXT FIGURES. 



Fig. 1. Front leg of female and of male Calosoma sycophanta, showing differ- 

 ences in structure of front tarsal joints 7 



2. One of the tin boxes used for making the first shipments of Calosoma 



beetles 10 



3. One of the wooden boxes used for shipping Calosoma beetles from 



Europe 10 



4. Same box as in figure 3> with cover removed, showing method of packing. 11 



5. Wooden boxes from Japan, showing method of packing Calosoma bee- 



tles for shipment 12 



6. Rearing jars 15 



7. Small wire-screen cages, set in ground in insectary, for rearing Calo- 



soma larvae 16 



8. Box cages for hibernation of beetles 17 



9. Galvanized-iron wire cages used for wintering pairs of beetles 18 



10. One of the cages shown in figure 9, that has been removed from the earth. 19 



11. Out-door insectary used for beetle-rearing work 20 



12. Jars of earth containing eggs of Calosoma sycophanta 21 



13. Diagram showing temperature record during summer of 1909, the total 



egg-laying record, and mortality of female beetles for the same period . 24 



14. Method of securing data on the distance traveled by larvae of Calosoma 



sycophanta 31 



15. Roll of paper showing record of distance traveled by larva of Calo- 



soma sycophanta 32 



16. Larva of Calosoma sycophanta feeding on gipsy moth pupae on tree 



trunk, North Saugus, Mass., July, 1907 34 



17. A " Fiske " tray for feeding gipsy moth caterpillars 42 



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