BIBLIOGRAPHY OF ECONOMIC ENTOMOLOGY. 
117 
1010. Hagen, H. A. The probable parthenogenesis of Cecidomyia 
destructor. <17. Anier. Ent., Marcli, 1880, v. 1, pp. 05-60. 
Evidence to show that Cecidomyia destructor is sometimes parthenogenetic. 
1011. Hagen, H. A. Schadliehe Insecten (lurch den Ilefenpilz zu 
todten. <Zool. Anz., 19 April, 1880, y. 3, p. 185. 
Note on the destruction of injurious insects by disease-producing fungi. 
1012. Hagen, H. A. The destruction of insect pests by application of 
yeast. <]STature, 29 April, 1880, v. 21, p. 611. Acker untl 
Gartenbau—Zeituug, September, 1880. S.-b. No. 23. 
Reply to statement of E. Ray Lankester; evidence concerning the destruc¬ 
tion of insects by disease-producing fungi. 
1013. Hagen, H. A. On the destruction of obnoxious insects by yeast. 
<Can. Ent., May, 1880, v. 12, pp.%1-83. Ent. Zeit. Stettin, 
July-September, 1880, v. 41, pp. 355-357. 
Evidence to show that yeast fungus kills insects. 
1014. Hagen, H. A. Cordyceps ravenelii on the larvte of Phyllophaga, 
<Can. Ent., May, 1880, v. 12, p. 89. 
Description of Cordyceps ravenelii quoted from Curtis; notes on the larva* of 
Phyllophaga [= Lachnosterna], 
1015. Hagen, H. A. A new enemy of the black spruce, Abies nigra. 
<Can. Ent., July, 1880, v. 12, p. 121. <Ann. Kept. Ent. Soc. 
Ontario for the year 1880, 1881, p. 35. 
Ravages of an undetermined tineid. 
1016. Hagen, H. A. The Hessian fly not imported from Europe. 
<Can. Ent., October, 1880, v. 12, pp. 197-207. <3d Kept. U. 
S. Ent. Commission, 1883 [6 March, 1884], pp. [43]—[49]. 
See Part 3, No. 2267, p. 322. 
1017. Hagen, H. A. Note on a sarcophagous larva found in a girl’s 
neck. <Proc. Bost. Soc. Nat. Hist., November, 1880, v. 20, 
pp. 409-410. 
Relates to a species of Sarcophaga; previous cases recorded. 
1018. Hagen, IT. A. The yellow fever fly. <Psyche, December, 1880, 
v. 3, p. 111. 
Abundance of Sciara sp. in 1855 during the prevalence of yellow fever. 
1019. Hagen. II. A. Entomological notes. <Can. Ent., February, 
1881, v. 13, p. 37. 
Brief notes on Cecidomyia sp.?, Papilio philenor, and Nematus erichsonii. 
1020. Hagen, H. A. Experiments with yeast in destroying insects. 
<Can. Ent., February, 1S82, v. 14, p. 39. <Kept. Ent. Soc. 
Ontario for the year 1882, 1883, p. 29-30. 
Conclusions drawn from the experiments of Thomas II. Hart. 
1021. Hagen, H. A. Insects injurious to fruit. <Can. Ent., June, 
1883, v. 15, pp. 119-120. 
Review of book of William Saunders. 
1022. Hagen, H. A. Trypeta cerasi L. <Can. Ent., August, 1883, 
v. 15, pp. 159-160. 
Occurrence of larva} and pupae of T. cerasi ? in fruit of black cherry. 
