COLLECTING AND PRESERVING INSECTS RILEY. 



Moths. 

 are at 

 guished 

 bv their 



FIG. 17. A Clothes-moth (Tinea pellionella) enlarged, a, adult; 6, 

 larva; f, larva in case. 



"A convenient system of classification for the Lepidoptera is based on 

 the structure of the antennae. By it we get two great sections : 1st, But- 

 terflies (RHOPALOCE- 

 RA); 2d, Moths (HET- 

 EROCERA), which lat- 

 ter may again be di- 

 vided into Crepuscu- 

 lar and Xocturnal 

 Butterflies 

 once distin- 

 from moths 

 antennae be- 

 straight, stiff and 

 knobbed, and by being 

 day-fliers or diurnal; 

 while moths have the antennae tapering to a point, and are, for the 

 most part, night-flyers or nocturnal. The crepuscular moths, composed 

 mostly of the Sphinges or Hawk-moths, hover over flowers at eve, and 

 connect the two sections not only in habit, but in the character of the 

 antennae, which first thicken toward the end, and then suddenly termi- 

 nate in a point or hook. 



" Order HEMIPTERA (i t! u, half; ^repo*, wing), Bugs. The insects of 

 this order are naturally separated into two great -sec- 

 tions; 1st, Half- winged Bugs, orHETEROPTERA (zTspoq 

 different; -r?[>ov 7 wing) having the basal half of the 

 front wings (called hemelytra) coriaceous or leathery, 

 while the apical part is membranous. The wings 

 cross flatly over the back when at rest; 2d, Whole- 

 winged Bugs, or HOMOPTERA (ofj.6<;, equal; -rspuv^ 

 wing), having all four wings of a uniform mem- 

 branous nature and folding straight down the back 

 The latter, if separated, may be looked upon as a Sub- 



FIG. 18. A Plant- 

 bug (Euschistes 

 punctipes) . 



when at rest, 

 order. 



"Transformations incomplete; i. e., the larvae and pupae have more or 

 less the image of the perfect insect, and differ 

 little from it except in lacking wings. 



''The genuine or half- winged Bugs (Figs. 

 18 and 10) are usually flattened in form, 

 when mature; though rnoiv rounded in the 

 adolescent stages. They may be divided 

 into Land Bugs (Aurocorisa) and Water 

 lings (Hydrocorisa). The species of the first 

 division very generally possess the power 

 of emitting, when disturbed or alarmed? 

 a nauseous, bed-buggy odor, which conies 



FIG. 



19. A Soldier-bug (Milijas 

 i-iix-tna). 6, beak enlarged. 



from a fluid secreted 



