18 BULLETIN 812. U. S. DEPAETMENT OF AGKICULTUKE. 



as South Dakota by C. N. Ainslie. This parasite attacks the larvse 

 of its host, and develops within the infested seeds. It has not been 

 observed attacking the chalcis-fly when the latter infested seeds of 

 red clover. This species is most active during midsummer. It ap- 

 pears slower in resuming activity in spring than the other species 

 studied. 



HABROCYTUS MEDICAGINIS Gahan (7). 



Edbrocytus medicaginis ^ (PL VII) is present throughout Cali- 

 fornia, Idaho, Utah, and parts of Arizona. It has also been reported 

 from South Dakota, Kansas, New Mexico, Nevada, and Oregon. 

 While this parasite can not be depended upon at the present time to 

 control the chalcis-fly in any locality where it has been observed, it 

 is of value in checking the abundant development of its host. This 

 species is parasitic externally upon the larvse of its host, and com- 

 j)letes its development within the infested seed. 



From all observations, Hahrocytus medicaginis attacks the chalcis- 

 fly only when the latter infests the seeds of alfalfa. This parasite 

 has never been found upon the same host within red clover seeds. 



TETRASTICHUS VENUSTUS Gahan (7). 



Tetrastichus venustus does not occur in sufficient numbers to be 

 considered of economic importance as a parasite of the chalcis-fly 

 in alfalfa seeds. While this species has been reared in small numbers 

 from alfalfa seeds infested with the seed chalcis-fly, and is without 

 doubt a parasite of the latter, the larval stage has not been recog- 

 nized. Specimens were reared by the writer from Corcoran, Red 

 Bluff, and Tulare, Calif., and from Yuma, Ariz. 



TRIMEROMICRUS MACULATUS Gahan (6).2 



T rimer oTnicTus mjiculatus (PI. VIII) is of economic value as a para- 

 site of the alfalfa-seed chalcis-fly throughout Arizona and Cali- 

 fornia. It has been found especially active in the Buckeye and Yuma 

 Valley seed districts of Arizona, and in the Honey Lake and Im- 

 perial Valleys of California. 



UODONTOMERUS INSUETUS Gahan (8). 



Notes on file in the Bureau of Entomology, made by H. T. 

 Osborn, under date of September 19, 1910, show the larvae of this 

 species to be parasitic upon larvae of Bruchophagv^ funehris. Speci- 

 mens in the National Museum were reared by C. N. Ainslie, Mesilla 



^ For a more complete account of this si)ecies, see Urbahns (9). 

 2 For a fuller description, see Urbahns (11). 



