62 INSECUTOR INSCITI^ MENSTRUUS 



the larvae living in irregularities of the bark. Recorded only 

 from Michigan; occurs also in Illinois, Missouri, Maryland, 

 and the District of Columbia (coll. Hood). 



43. Rhynchothrips pruni Hood. — February 2; one female 

 and one male, taken under bark of wild cherry tree (Prunus 

 serotina Ehrh.). Previously knov^n only from Illinois. 



43. Rhynchothrips salicarius Hood. — May 9-October 12; 

 many females, taken at the base of young willow shoots, where 

 their feeding deformed the young leaves and retarded the 

 growth of the trees. Taken also at Bluemont, Virginia, Au- 

 gust 31. Previously known only from Plummer's Island. 



44. Liothrips carycz (Fitch). — May 18-June 29; common in 

 Phylloxera galls on leaves of hickory. Until its redescription in 

 1914, this species had been lost to science for nearly 60 years. 

 Known from New York, Maryland, and Illinois. 



4f5. Liothrips citricornis (Hood). — April 20-August 18; 

 common on the under surface of the leaves of hickory and 

 grape ; occasionally also on dogwood ( Cornus florida L. ) and 

 Viburnum. Recorded from Pennsylvania, Illinois, Michigan, 

 and Tennessee ; occurs also in Maryland, District of Columbia, 

 and Virginia (coll. Hood). 



46. Liothrips leucogonis Hood. — April 28; one female (the 

 type) taken from Ostrya virginiana L. Known only from 

 Maryland. 



47. Leptothrips mali (Fitch) {=Cryptothrips aspersus 

 Hinds). — Common from early spring to late fall, living singly 

 on the leaves of various trees. Recorded from Massachusetts, 

 Pennsylvania, Maryland, District of Columbia, Florida, Michi- 

 gan, Indiana, Illinois, Tennessee, Missouri, Texas, California, 

 Mexico, Panama, and Barbados ; occurs also in Wisconsin, 

 New York, and Virginia (coll. Hood). Mr. R. A. Cushman, 

 of the Bureau of Entomology, has several times observed this 

 species preying on aphids. 



48. Hoplandrothrips xanthopus Hood. — August ll-October 

 12 ; abundant in dead leaves of maple, oak, and willow. Pre- 

 viously known only from Illinois and Pennsylvania ; taken also 

 by R. A. Cushman and the writer at Vienna, Virginia. 



