46 



ILLINOIS NATURAL HISTORY SURVEY CIRCULAR 39 



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Fig. 48. — Hymenoptera. Lasius interjectus, a harmless winged ant, the 

 yellow ant, with which the winged termite is often confused. A, queen with 

 wings spread, many times natural size. B, worker ant, natural size. C, queen, 

 natural size, with wings partially closed and as usually seen. The ant has 

 a narrower waist and shorter wings than the termite. Actual length of 

 queen about 0.3 inch. 



in the Neuroptera and with the 

 size from the front wings. The 

 are caterpillar-like or grublike, 

 This very large order in- 

 cludes such well-known 

 forms as the bees, wasps, and 

 ants. In addition, it includes 

 the sawflies, whose caterpil- 

 lar-like larvae are extensive 

 defoliators of a large num- 

 ber of native and cultivated 

 plants and shrubs ; the large 

 and varied groups of para- 

 sitic wasps that exert great 

 influence in the natural con- 

 trol of a tremendous number 

 of other insects ; and a large 

 number of gall-making 

 wasps, whose galls are espe- 



hind wings different in shape and 

 young stages of the Hymenoptera 

 entirely different from the adults. 



Fig. 49. — Hymenoptera. Cheiropa- 

 chys colon, a parasitic wasp that vic- 

 timizes one of the bark beetle larvae. 

 Actual length about 0.1 inch. 



