Apr. 3-Sept. 25, 1916 



Illustrations xxv 



Lepe-History Studies op Cirphis vnjpuncta, the True Army Worm 



Page 



Fig. I. Diagram of relative amounts of foliage eaten in each larval instar by 



Cirphis unipuncta 801 



2. Posterior extremity of male and female pupa: c, Male ; h, female 812 



Thersilochus conotracheli, a Parasite of the Plum Curculio 



Fig. I. Tliersilochus conotraclieli: Cocoon 852 



2. Tliersilochtis conotracheli: Egg 852 



3. Tliersilochus conotracheli: Larva of first instar 852 



4. Thersilochus conotracheli: Ventral siu^ace of head of first larval instar: 



a, Labrum; b, maxilla; c, labium; d, mandible 853 



5. Thersilochzis conotracheli: Full-grown larva of first instar 853 



6. Thersilochus conotracheli: Larva of second instar 853 



7. Tliersilochus conotracheli: Full-grown larva of fifth instar 854 



8. Thersilochus conotracheli: Face of full-grown larva: a, Labrum; b, man- 



dible; c, maxilla; d, maxillary palpus; e, labium; /, labial palpus. . . 854 

 g. Thersilochus conotracheli: Pupa of female, and apex of abdomen of male 



pupa 854 



Effect on Plant Growth of Sodium Salts in the Sou, 



Fig. I. Diagram of the percentage of sodium carbonate added to the soil in 

 experiment i (1913), with the percentage of carbonate and bicar- 

 bonate recovered and the total green weight of wheat obtained 860 



2. Diagram of the percentage of sodium carbonate added to the soil in 



experiment 2 (i9i4\ with the percentage of carbonate and bicar- 

 bonate recovered and the green weight of wheat obtained 862 



3. Diagram of the percentage of sodium carbonate added to the loam soil 



in experiment 3 (1915), with the percentage of carbonate and bicar- 

 bonate recovered and green weight of wheat 864 



4. Diagram of the percentage of sodium carbonate added to Monterey sand 



in experiment 3 (19 15), with the percentage of carbonate and bicar- 

 bonate recovered and the total green weight of wheat obtained 864 



5. Diagram of the percentage of sodium bicarbonate added to the soil in 



experiment 4 (1914), with carbonate and bicarbonate recovered, 

 together with the total green weight of wheat obtained 865 



6. Diagram of the decrease in growth of wheat seedlings in experiments 2 



and 4 as affected by the total carbonate salts recoverable from the soil . 866 



7. Diagram of the quantity of sodium chlorid added to the soil, with the 



quantity of chlorid recovered, and the total green weight of wheat 

 obtained 867 



8. Diagram of the quantity of sodium sulphate added to the soil in experi- 



ment 6, the quantity recovered, and the total green weight of wheat 

 obtained 868 



Aphidoletes meridionalis, an Important Dipterous Enemy of Aphids 



Fig. I. Aphidoletes meridionalis: Eggs in situ on leaf of rape; a, egg 884 



2. Aphidoletes meridionalis: Larva, dorsal view 886 



3. Aphidoletes meridionalis: a, Cocoon formed on surface of ground; b, 



cocoon formed on a leaf blade 886 



4. Aphidoletes meridionalis: Pupa, lateral view 887 



