16 BULLETIN 1336, U. S. DEPARTMENT OF AGRICULTURE 



NATURAL ENEMIES 



Ten species of parasites were reared front Plathypena. scabra collected 

 in Tennessee, and 18 more have been reported from other localities. 

 Fourteen of these are Hymenoptera and 14 Diptera. Predators and 

 fungi were also found to attack this insect extensively. 



HYMENOPTERA. 



Apanteles harnedi Vier. 3 was reared by the writer from larvae col- 

 lected at Nashville and Knoxville, Term., in the years 1914, 1915, 

 and 1916, and by C. L. Scott at Brownsville, Tex., March 30, 1913. 



A campoplegine, probably a new species and new genus, was 

 recorded by Sherman (10) as reared in North Carolina. 



Euplectrus comstockii How. was reported by C. N. Ainslie as very 

 commonly oarasitizing Plathypena. scabra in the vicinty of Elk 

 Point, S. Dak. 



Euplectrus platyhypenae How. was reared from this host at Wash- 

 ington, D. C., on July 11, 1882, from material collected in that 

 vicinity, and was described by Howard (6) who named it after the 

 genus Plathypena. 



Hemiteles sp. 4 was reared by P. Luginhill at LaFavette, Ind., 

 April 2, 1912. 



Meteorus sp.; one specimen 5 was reared by the writer at Nash- 

 ville, Tenn., in 1915. 



Mesochorus sp.; a single specimen 5 was reared by the writer at 

 Nashville, Tenn., in 1915. 



Microgaster facetosa Weed 6 was reared from this host at Knoxville 

 and Nashville, Tenn., by the writer, and at Hagerstown, Md., bv 

 H. L. Parker (8\ 



Microplitis varicolor Yier. was reared from this host at Columbia, 

 S. C, by R. J. Kewley, and by the writer at Nashville, Tenn. (8). 



RTiogas canadensis Cress. ; a single specimen 7 was reared from 

 Plathypena. scabra by Philip Luginbill at LaFayette, Ind., in 1911. 



(Rhogas) Aleiodes intermedins Cress, was reported by Hawley (4) 

 as reared from a P. scabra larva collected in New York. 



Rhogas nolophanae Ashm. 8 was the most common parasite at Nash- 

 ville, Tenn., in 1914. It was reared from larva? collected in the spring, 

 the adults first appearing about the 20th of May. The cocoon is 

 yellowish-brown, slender, from 8 to 10 millimeters long by 1.75 

 millimeters wide, and formed from the shrunken and stiffened skin 

 of the caterpillar. Not more than one individual was reared from 

 a. single host. Six specimens each passed eight days in the cocoon. 

 The exit hole is made on the dorsum in the vicinity of the sixth and 

 seventh abdominal segments. 



Rhyssalus loxoteniae Ashm. was reported by Hawley (4) as reared 

 from a larva of this insect collected in New York. 



Trichogramrna pretiosa Riley was recorded by Sherman (10) as 

 being a very common parasite of the egg in North Carolina. 



3 Four specimens reared in Tennessee determined by A. B. Gahan. 



4 One specimen determined by H. L. Viereck. 

 6 Determined by A. B. Gahan. 



6 Eleven specimens from Knoxville, Tenn., determined by A. B. Gahan. 



7 Determined by H. L. Viereck. 



8 Nine specimens determined by A. B. Gahan. 



