No. l6.] INSECTS OF CONNECTICUT. 37 



THYSANOPTERA (or PHYSOPODA). Includes only 

 the family Thripida. A small order of small-sized individuals, 

 mostly inhabiting flowers. A few species are injurious. f 



HEMIPTERA. Lice, aphids, bugs, scale-insects, leaf- 

 hoppers, tree-hoppers, psyllids, cicadas, and other sucking insects. 

 Plate III. This large and important order contains many species 

 and individuals. It is divided by some authors into three orders, 

 namely, the HOMOPTERA, including cicadas, leaf-hoppers, 

 aphids, and scale-insects ; the HETEROPTERA, including the 

 assassin-bugs, leaf bugs, bed-bugs, and related forms ; the 

 PARASITICA, including the lice which are parasitic upon man 

 and the higher animals. There are a great many species among 

 the Hemiptera which are regarded as injurious. 



ISOPTERA. Termites or white ants. A small order, includ- 

 ing a single family of social insects. Some species are very 

 destructive, tunneling in trees, construction timbers, etc. 



MALLOPHAGA. Biting bird-lice. A small order of small 

 wingless parasitic insects, having incomplete metamorphoses. The 

 species infest fowls and wild birds. 



CORRODENTIA. Book-lice. A small order of small-sized 

 insects which feed upon paper, lichens, etc. ; not of much eco- 

 nomic importance. 



PLECOPTERA. Stone-flies. A small order, including a 

 single family, of little economic importance. Larvae aquatic, 

 serving as food for fishes. 



EPHEMERIDA. May-flies or Day-flies. This order con- 

 tains only a single family of insects, of which there are few 

 species, but many individuals, found near lakes and rivers. Not 

 important economically. 



NEUROPTERA. Dobsons, ant-lions, lace-wings, etc. Plate 

 III. A rather small group of insects with transparent mem- 

 branous wings. Some species, like the dobson, are of large size. 



MECOPTERA. Scorpion-flies. A small but remarkable 

 group of insects, with the head prolonged into a beak. So far 

 as known, these insects are carnivorous. 



TRICHOPTERA. Caddis-flies. A small but interesting 

 order of moth-like insects. The adults have parchment-like 

 wings, which are more or less hairy and folded against the sides 



