[17] 



COLLECTING AND PRESERVING INSECTS RILEY. 



Fig. 17 



-A Clotbes-motli (Tinea pellionella) — enlarged, 

 larva ; c, larva in case. 



a, adult ; b, 



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

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

 terflies (Rhopaloce- 

 RA)5 2d, Moths (Het- 

 EROCEEA), wMcli lat- 

 ter may again be di- 

 vided into Crepuscu- 

 lar and l!^octurnal 

 Moths. Butterflies 

 are at once distin- 

 guished from moths 

 by their antennae be- 

 ing straight, stiff and 

 Jcnohhed, 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 HEMIPTEEA {rj,ac, half; -zepo,, wing). Bugs. The insects of 

 this order are naturally separated into two great sec- 

 tions; 1st, Half- winged Bugs, or Heteroptera {k'-spoq 

 different; -re^o^vv, wing) having the basal half of the 

 front wings (called liemelytra) 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 {op-oq^ equal; T.repvv^ 



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; L e., the larvae and pupae have more or 

 less the image of the perfect insect, and difter 

 little from it except in lacking wings. 



"The genuine or half- wiuged Bugs (Figs. 

 18 and 19) are usually flattened in form, 

 when mature; though more rounded in the 

 adolescent stages. They may be divided 

 into Land Bugs {Aiiromrisa) and Water 

 Bugs {Hydrocorisa). The species of the first 

 division very generally possess the power 

 of emitting, when disturbed or alarmed, 

 a nauseous, bed-buggy odor, which comes 

 2564 2 



Fig. 



cinctus) . 



from a 



a ^ b 



19. — A Soldler-bug (Milyas 



&! beak enlarged. 



fluid secreted 



