INSECUTOR INSCITI^ MENSTRUUS 61 



from Massachusetts, Florida, Michigan, Iowa, Oregon, Cali- 

 fornia, New York, Pennsylvania, District of Columbia, Mary- 

 land, Virginia, Illinois, South Dakota, and Montana. 



34. Haplothrips verhasci Osborn. — July 27 ; both sexes com- 

 mon on mullein (Verbasciim thapsus L.). Recorded from 

 Massachusetts, Florida, Tennessee, Michigan, and Iowa ; oc- 

 curs also in Pennsylvania, Maryland, District of Columbia, In- 

 diana, and Illinois (coll. Hood). Feeds exclusively on mullein. 



35. Zygothrips americanus Hood. — Throughout the year, 

 under loose bark of every species of tree examined. Recorded 

 from Illinois, Michigan, Missouri, Nebraska, and Maryland ; 

 taken also in the District of Columbia, and at Vienna, Virginia 

 (R. A. Cushman). 



36. Lissothrips muscorum Hood. — April 12; several females 

 from moss on tree trunk. Recorded only from Illinois ; speci- 

 mens at hand add Michigan, District of Columbia, and Mary- 

 land, to its known distribution. 



37. Hoplothrips karnyi karnyi Hood. — May 18 and October 

 12 ; both sexes under hickory and willow bark. Known also 

 from Illinois and Virginia. Plummer's Island is the type 

 locality. 



38. Trichothrips angusticeps Hood. — February 20 ; two fe- 

 males from beneath moist bark on maple log covered with 

 Polyporus. Recorded only from Illinois ; occurs also in Penn- 

 sylvania, Maryland, and Virginia (coll. Hood). 



39. Trichothrips flavicauda Morgan. — October 5 ; two fe- 

 males and one male, under bark on fungus-covered willow 

 branch. Described from Kentucky ; in addition to the above- 

 mentioned specimens, I have one female from Bluemont, Vir- 

 ginia, taken August 31 from a dead branch of pawpaw (Asi- 

 mina triloba (L.) Dunal). 



40. Trichothrips anomocerus Hood. — January 26-March 30; 

 often abundant under sycamore bark. Taken at Vienna, Vir- 

 ginia, May 3, under bark of grape, by R. A. Cushman. De- 

 scribed from Plummer's Island, Maryland. 



41. Rhynchothrips tridentatus (Shull). — April 6; one male 

 taken on leaf of Trillium ; a common species on various oaks, 



