23 
ers of their beneficial attack upon eggs it may be that our cage con- 
ditions were not suitable for aggressive work of this mite. The 
numbers to be found were very assuring and this mite must be recog- 
nized as an important enemy to grasshoppers. 
The larvee of a species of Carabid beetle, which we were unable to 
Fic. 7.—Trombidium locustarwn: a, mature larva when about to leave the wing of a locust; b, pupa; 
¢c, male adult when just from the pupa; d, female—the natural size indicated to the right; ¢, palpal 
claw and thumb; /, pedal claws; g, one of the barbed hairs; h, the striations on the larval skin 
(from Riley). 
rear to the adult condition, were also found to be an energetic feeder 
upon eggs. With their large mandibles they were observed breaking 
the egg sacs and devouring the contents. 
During April, May, and June the ash and black colored blister 
beetle (Macrobas/s unicolor) (see tig. 8) showed by its numbers and the 
manner of the attack of the young to be an 
important enemy of grasshopper eggs. In 
sweeping they were a common capture, and 
in following the plows and cultivators the 
pseudo pup (coarctate) were seen in great 
numbers. The young of the first and second 
stages were also found among the egg-pods. 
Of the true parasitic forms two species 
were bred, Scelio hyalinipennis Ashm. and 
Scelio wedipode Ashm. While the former 
species appeared earlier than the latter, both 
continued to emerge as adults irregularly ie. s—Macrobasis unicolor: Fe- 
fom Maye until the latter ‘part of June. mele beetle at right, twice nat. 
* “ * ural size; male antenna at left, 
They were found to come in the majority greatly enlarged (from Chitten- 
of cases from the eggs of the lower end of  %™)- 
the pod, and in a few instances this was found the case even where 
grasshoppers were coming from the upper ends. As a rule not all of 
the eggs of the pods are parasitized, and the inference is that the habit 
of the parasites to attack the deeper placed eggs is to so retard the 
development of the offspring as to guarantee food for the broods that 
