18 BULLETIX 812. TJ. S. DEPARTMENT OE AGRICULTURE. 
as South Dakota by C. X. Ainslie. This parasite attacks the larvae 
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. 
HABROCYTTJS MEDICAGINIS Gahan (7). 
Habrocytus medic ag mis 1 (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- 
pletes its development within the infested seed. 
From all observations, Habrocytus 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). 
T etrastichus 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 omicrus maculatu-s (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. 
LIODONTOMERUS 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 larvse of Bruchophagus funebris. Speci- 
mens in the National Museum were reared by C. X. Ainslie, Mesilla 
1 For a more complete account of this species, see Urbahns (9). 
2 For a fuller description, see Urbahns (11). 
