. Report of the State Entomologist on injurious and other insects of the state of New York. uddy brown envelopsomewhat like the flax seed of the Hessian fly. The activitiesof this insect, like the Hessian fly, Mayetiola destructorSay, are evidently closely correlated with the condition of vegetation,breeding continuing so long as a suitable food supply exists. Thelife cycle may be completed in from 14 to 20 days. io8 NEW YORK STATE MUSEUM This midge is abundantly parasitized in certain localities byAprostocetus diplosidis and Tetrastichus, the latterbeing both a primary and secondary parasite.

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. Report of the State Entomologist on injurious and other insects of the state of New York. uddy brown envelopsomewhat like the flax seed of the Hessian fly. The activitiesof this insect, like the Hessian fly, Mayetiola destructorSay, are evidently closely correlated with the condition of vegetation,breeding continuing so long as a suitable food supply exists. Thelife cycle may be completed in from 14 to 20 days. io8 NEW YORK STATE MUSEUM This midge is abundantly parasitized in certain localities byAprostocetus diplosidis and Tetrastichus, the latterbeing both a primary and secondary parasite. By far the mostimportant predaceous enemy of the midge is the Argentine ant,Iridomyrmex humilis Mayr. These insects swarm overthe 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 isprobable that humming birds also devour these small flies. Remedial measures. Johnson grass should not be allowed togrow in the vicinity of sorghum fields, since it is an important factor. Fig. 31 C o n-tarinia sor-g h i c o 1 a, fifthantennal segmentof male (enlarged,original)

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Keywords: ., bookcentury1800, bookdecade1880, booksubjectinsects, bookyear1882