i8o 



PARTIAL BIOLOGICAL BIBLIOGRAPHY OF BACCHA. 



1 Osten Sacken, Baron "Entomologische Notizen," Stettin. 



Ent. Zeit. XXIII, 412 (1862.) 



Refers to earlier records of habits of Baccha- 



spp., especially Coccidivorous forms. 



2 Williston, S. W. "Synopsis of the North American Svrphi- 



dae," Bull. U. S. Mus. 31 : 269-83 (1886.) 

 Larvae aphidophagous, provided with well- 

 developed hooklets. 



3 Verrall, G. II. "British Flies" VIII, 455-9 (1901.) 



Larvae feed on Aphidae or Coccidae. 



DESCRIPTION OF PLATES. 



Plate VIII. 



1. Egg-s of ChcIisocJics niorio. 



2. Embryo of the same in ovo. 



3. Larva of the same ist instar. 



4. The same 2nd instar. 



5. The same 3rd instar. 



6. The same 4th instar. 



Plate IX. 



1. Adult female of C. iiiorio. 



2. Adult male of C. iiiorio. 



3. Adult female of Aiiisolabis aiiiiiilif>cs. 



4. x\dult male forceps of the 'same. 



5. V^entral surface of the distal portion of the abdomen of 

 the female of C. inorio. The large ventral plate (sternite 7) has 

 been removed. a, cut edge of the 7th sternite ; h ; chitinized an- 

 terior angle of the 8th sternite ; c, anus ; f, ar'ticular portion of 

 the loth sternite; (the articulation allows the free passage of 

 foecal matter; o-, loth sternite; h, loth tergite ; ;', thinly chitiniz- 

 ed plate of the 9th sternite ; k, 9th tergite : /, 8th tergite ; ;//, 7th 

 abdominal stigma ; ;/, genital aperture. 



6. Ventral surface of the distal portion of the abdomen of a 

 male of C. iiiorio. The terminal ventral plate (sternite 9) has 

 been removed. 



