126 



FIELD ZOOLOGY. 



dition of the mouth-parts. In most species of the order 

 there is a well-developed proboscis. (Fig. 53 .) This differs 

 from the sucking beak of the hemipters structurally, 

 and it is also unlike it in the manner in which it is used. 



FIG. 52, A. Front wing of monarch butterfly, showing veins. C, costal; 

 SC, subcostal; R, radius; DC, discal cell; R, i, 2, 3, 4, 5, branches of radius; 

 M, i, 2, 3, branches of median vein; CU, cubitus; A, anal vein. 



FIG. 52, B. Hind wing of monarch butterfly, showing veins; lettering same as 

 for front wing. The scent pocket is shown on the Cu 2 vein. 



The beak of the hemipter is a stiff organ, and when not in 

 use, is usually folded once sharply under the head, against 

 the thorax, by means of the hinge-like articulation just 

 where the beak joins the head. Not only is this true, 



