COKISIJ5. 545 



"of a splendid golden appearance." The larvoe and pup:o of 

 several species of Coreus have been observed by Westwood 

 to "differ from the imago in wanting ocelli, possessing only 

 two joints in the tarsi (although there is a slight indication 

 of an articulation in the middle of the terminal joint) ; their 

 antennae also are much thicker, especiall}' the intermediate 

 joint. The pupa of C. scapJia differs also from the imago in 

 having the margins of the abdomen notched." Several adult 

 forms of this group are known to be partially wingless. 



The Squash-bug, Coreus (Gonocerus) tristis DeGeer (Fig. 

 549) is very destructive to squash-vines, collecting in great 

 numbers around the stem near the ground, and sucking the 

 sap with its stout beak. It is a large, blackish brown insect, 

 six-tenths of an inch long, and dirty yellowish beneath. It 

 hibernates, leaving the plant in October. About 

 the last of June the sexes meet, and the females 

 "lay their eggs in little patches, fastening them 

 with a gummj^ substance to the nnder side of the 

 leaves. The eggs are round, and flattened on' 

 two sides, and are soon hatched. The 3'oung 

 bugs are proportionall}" shorter and more rounded 

 than the perfect insects, are of a pale ash color, 

 and have quite large antennae, the joints of which are some- 

 what flattened. As they grow older and increase in size, after 

 moulting their skins a few times, they become more oval in 

 form, and the under side of their bodies gradually acquires a 

 dull ochre-yellow color." (Harris.) The young attack the 

 leaves, causing them to wither up. Successive broods are 

 said to appear through the summer. Professor Verrill has 

 found, with the assistance of Professor S. W. Johnson, of Yale 

 College, tliat the odor of this and other hemipterous insects 

 bears the most resemblance to that of the formate of oxide of 

 amyl, or the formate of amylic ether. It is probable that this 

 substance is its most essential and active ingredient. (^Pro- 

 ceedings of the Boston Society of Natural History-, xi,. p. 

 160.) 



In Neides the body is remarkabh' thin and slender, i-epeat- 

 ing the form of I'loiaria, or of Spectrum among the ©llhoptcra.. 



In Alydm the body is small, slender, the head, prolonged^. 



