218 APPENDIX TO VOL. I. 



2. Eggs laid by virgin females yielded males and 

 females with Alia fasciata (Dr. Osborne* and von 

 Siebold), Nematus ribesii (von Siebold and Cameron). 



3. Eggs laid by virgin females produced females with 

 Cimbex connata (von Siebold " from the virgin females 

 without exception only females were bred," lib. cit., 

 p. 94), Nematus appendiculatus (Cameron), N. con- 

 ductus (Cameron), N. gallicola (Adler). 



4. Eggs were laid by virgin females of the follow- 

 ing species, but did not yield imagos. Blennocampa 

 nigripes (von Siebold), Eriocampa limacina (von Sie- 

 bold), Cladius ruftpes (Cameron), Nematus ruficornis 

 (Cameron), Nem. compressicornis (Cameron), Tri- 

 chiosoma sorbi (von Siebold), Hylotoma ustulata 

 (Cameron). 



Dr. Osborne* has made some highly interesting ex- 

 periments and observations on Abia fasciata. From 

 larvse gathered outside Dr. Osborne bred flies which, 

 without any connection with males, laid fertile eggs 

 abundantly which duly hatched and yielded female 

 flies the following year. These again laid eggs par- 

 thenogenetically, but much less freely ; from these were 

 obtained a third generation of flies which also laid a 

 few eggs, none of which, however, developed. 



In this species the males are very rare compared to 

 the females. Thus von Siebold bred only five or six 

 males to hundreds of females from parthenogenetic 

 eggs (Ent. Nachr., x, p. 94). From larvae collected 

 outside Dr. Osborne obtained 172 females and only one 

 male from 282 cocoons, besides 28 which yielded ich- 

 neumons. During the present year he had 270 cocoons 

 spun by larvae the produce of parthenogenetic females 

 reared in confinement from larvae collected outside. 

 These only produced 100 living flies, 97 females and 3 

 males, while he found 32 dead females and 3 dead 

 males, which had perished in the cocoons. From 32 

 doubly parthenogenetic cocoons Dr. Osborne only 

 obtained 4 living flies, and in the cocoons found 11 

 * E. M. M., xix, 97 j xx, 145 and 205 ; and xxi, 128. 



