108 NEW YORK STATE MUSEUM 
This midge is abundantly parasitized in certain localities by 
Aprostocetus diplosidis and Tetrastichus, the latter 
being both a primary and secondary parasite. By far the most 
important predaceous enemy of the midge is the Argentine ant, 
Iridomyrmex humilis Mayr. These insects swarm over 
the sorghum plants and seize and carry off the midge pupae pro- 
jecting from sorghum seeds. A fly, Psilopodinus flavi; 
ceps Aldr., has been observed preying upon the midges. It is 
probable that humming birds also devour these small flies. 
Remedial measures. Johnson grass should not be allowed to 
grow in the vicinity of sorghum fields, since it is an important factor 

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CaN Rane Leah Pais 
NON ebb MISSY 
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Fig. 31 Con- Fig. 32 Con- 
hAyieabil i Ges 
ghacola. fitth 
antennal segment 
of male (enlarged, 
original) © 
BALm ile), So ies 
gah ollareshtth 
antennal segment 
of female (en- 
larged, original) 
in producing an early infestation. Clean harvesting, resulting in 
the caring for and adequate destruction of infested heads, will do 
much to reduce the number of midges appearing the following 
season. The destruction of the early crop of seed has been sug- 
gested as a means of eliminating a large percentage of the midges 
and thus securing a nearly full, clean, late crop. 
Description. Egg. Length .15 mm, pale pink or yellow, delicate, 
elongate, cylindric. 
Larva. ‘The full-grown larva is broadly oval, deep red and with a 
distinct breastbone. 
