52 MAINE AGRICULTURAL EXPERIMENT STATION. I902. 



The winged forms are larger than the wingless ones, brown in 

 color, and have two pairs of long slender wings, each of which 

 is reduced to a narrow piece, having two or three short veins, 

 and bearing on its edges two rows of fine hairs, fig. 6, hw and fw. 

 The hairs are placed so that the upper row on each wing crosses 

 the lower row at an acute angle and, when the wings are 

 extended, the hairs on the posterior edge of the fore wing over- 

 lap those on the anterior edge of the hind wing. This gives 

 practically the same resistance as if the wings were entire. 

 When the wings are folded they lie along the dorsal wall of the 

 abdomen, nearly its entire length, with the anterior above the 

 posterior pair. Their extremities are bent so that the ends of the 

 wings on each side of the body turn away from each other. 



In the wingless forms the wings may be entirely wanting, or 

 they may be represented by small protuberances, fig. 5, wp. 

 This form is light pink in color, and is covered with a thin soft 

 integument. The head is small and tapers toward its anterior 

 end. It bears two small compound eyes and three ocelli. The 

 antennas are placed on the extreme anterior part of the head, very 

 near to the median line. They are about .2 mm. in length, and 

 each is made up of eight joints. The basal joint is short and 

 stout. The next three joints are flask shaped, the anterior 

 enlarged end of each surrounding the neck of the succeeding 

 joint. The fifth joint is smaller than any of the preceding. The 

 sixth, seventh and eighth joints are fused into one long piece, the 

 sixth being much the longest of these three joints. At the ante- 

 rior end of each joint, around the rim of the cup, there is a row of 

 rather short stiff spines. There are also a variable number of 

 spines scattered over the surfaces of the several joints. 



The mouth is situated on the ventral side of the head and, on 

 account of the arrangement of the mouth parts, is placed so far 

 posteriorly that it opens at a point posterior to the junction of 

 the head and prothorax, fig. 14, mp. 



The prothorax, figs. 6 and 14, is short, a little wider than the 

 head, and nearly square in outline as viewed from the dorsal side. 

 The ventral is very much shorter than the dorsal surface, as the 

 head extends farther posteriorly on the ventral than on the dorsal 

 surface, (see fig. 14). It bears along its sides a number of 

 spines, and a few very short spines are scattered over the dorsal 

 surface. 



