THE CANADIAN ENTOMOLOGIST 231 



Berosus subsignatus Lee. — July to September, at night, taken at trap light, 



and a single specimen at random in August. 

 Philhydrus ochraceus Mels."' — August, at night, taken at trap light. 

 Phaenonotum extrialum Say.* — August, at night, taken at trap light. 



Family Pselaphid^. 

 Aiinus monilicornis Brand.* — August, at night, taken at trap light. Mr. 

 Schwarz added remark : "It is a rare species and strictly 

 myrmecophilous." 



Family Staph ylinid^.. 

 Trichiusa robustula Casey, det. Casey. — May, at dusk, in oat field. 

 Atheta sp., undescribed, det. Casey. — November. 

 Philonthus hepaticus Er.* — May, August, at night, taken at trap light. 

 Stenus colonus Er.* — August. 

 Dacnochilus argularis Er.* — Jnly. 



Family Phalacrid^. 

 Phalacrus penicillatus Say. — June, in oat field. 



politus Melsh. — September, at night, taken at trap light. 

 Eustilbus (Olibrus) apicalis Melsh. — May, at dusk, in oat field ; June, 



common in oat fields. 

 Acylomus ergoti (Walsh) Casey.* — May, at dusk, in oat field. Mr. 

 Schwarz remarked : "The insect is the old Olibrus 

 ergoti, so named by Mr. B. U. Walsh many years ago. but 

 not described by him. It was described by Casey as 

 Acylomus ergoti. It is an extremely common and widely- 

 distributed species living in the smut fungi (ergot) that are 

 so common on graminaceous plants." 



Family Coccinellid^,. 

 Megilla maculata DeG. — May, in oat field; June and July, invading ex- 

 periment cages with green bugs, Toxoptera graminum Rond., 

 in oat fields ; August to December, bred in experiments. 

 Hippodamia convergens Guer. — June, invading experiment cages with 

 green bugs in oat fields ; July, in oat fields and at ran- 

 dom ; October, November, in oat field. 

 Coccinella oculata Fab., melanistic form of abdominalis Say. — July, in 

 corn field near infestation by Aphis maidis Fitch ; October, 

 in old corn field. 

 Cycloneda (Coccinella) munda Say. — October. 



