11 



B. D. WALSH. On Dimorphism in the Hymenopterous genus Cynips; 



with an Appendix, containing hints for a new classification of Cy- 

 nipidae, including descriptions of several new species inhabiting 

 the oak galls of Illinois. <Proc. Entom. Soc. Phila., Vol. II, 

 1863-1864, pp. 443-500. 



GUSTAV MAYR. Die Genera der gallenbewohnenden Cynipiden. 

 <20ter Jahresbericht der Communal-Oberrealschule im I. Bezirk. 

 Wien, 1881. 



W. H. ASHMEAD. A bibliographical and synonymical catalogue of the 

 North American Cynipidse, with description of new species. 

 <Trans. Amer. Entom. Soc., Vol. XII, 1885, pp. 291-304. 



W. H. ASHMEAD. Synopsis of the North American subfamilies and 

 genera of Cynipidae. <Trans. Amer. Entom. Soc., Vol. XIII, 

 1886, pp. 59-64. 



W. H. ASHMEAD. On the cynipidous galls of Florida, with descrip- 

 tions of new species and synopses of the described species of North 

 America. <Trans. Am. Entom. Soc., Vol. XIV, 1887, No. 2, pp. 

 125-158. 



C. P. GILLETTE.: A monograph of the genus Synergus. <Trans. 



Amer. Entom. Soc., 1896, pp. 85-100. 



EYANIID^. 



A. SCHLETTERER. Die Hymenopteren-Gruppe der E vaniiden. < Ann. 

 K. K. Naturh. Hof museums, Wien, Vol. IV (1889), Parti, pp. 107- 

 180; Part II, 289-338; Part III, pp. 373-546. 



ICHNEUMONID^E. 



EDWARD NORTON. Catalogue of our species of Ophion, Anomalon, 

 Paniscus, and Campoplex. <Proc. Entom. Soc. Phila. , Vol. I, 



1863, pp. 357-368. 



Synoptic arrangement of the North American genera and species of the sub- 

 family Ophioninse. 



E. T. CRESSON. Descriptions of North American Hymenoptera in the 

 collection of the Entomological Society of Philadelphia. <Proc. 

 Entom. Soc. Phila., Vol. Ill, 1864, pp. 131-196. 



Consists chiefly of a synopsis of the North American species of the genus 

 Ichneumon. 



E. T. CRESSON. A list of the Ichneumonidae of North America, with 

 descriptions of new species. <Trans. Amer. Entom. Soc. , Vol. I, 

 1867 7 pp. 289-312; Vol. 11, 1868-69, pp. 89-114. 



E. T. CRESSON. Descriptions of new species belonging to the subfam- 

 ily Pimplariaa found in America, north of Mexico. <Trans. 

 Amer. Entom. Soc., Vol. Ill, 1870-71, pp. 143-172. 



Tabulates the genera Pimpla, Polysphincta, Glypta, Arenetra, Lampronota, 

 Xylonomus, Odoiitomerus, with a list of all species. 



