286 MAINS AGRICULTURAL EXPERIMENT STATION. 1909. 



is nothing especially striking in regard to the venation. The 

 characteristic curves of the veins have been faithfully repro- 

 duced (Fig. 1 08). At the junction of Sc with costal margin 

 the wing creases a little and a decided angle occurs at that 

 point in the wings of this species except when they are newly 

 emerged. This angle is more pronounced for this species than 

 any other of these Maine species, though the same tendency 

 is often shown by others to a slighter degree. The drawing 

 was made from a wing of a newly emerged individual and this 

 costal angle not indicated. 



The most distinctive characteristic in the wings of pinijoliae 

 is the decided arch of the costal margin of the fore wing and 

 the almost circular curve of the hind margin of the hind wing. 

 The shape of the wings alone would separate this species from 

 the other five developing in spruce galls in Maine. Packard's 

 figure of abieticolens* gives the characteristic outline of this 

 peculiar wing which alone would serve to separate it from abie- 

 tis. The legs are very stout. 



The antennae (Fig. 109) are 5- join ted, the segments stout, 

 III, IV and V are approximately subequal in length. Ill and 

 IV resemble each other closely both as to shape and sensorial 

 areas. V has the curve of the outline less abrupt, and the 

 sensorial area larger. Terminal hairs four or five in number 

 and slender (Fig. loga). The sensorial areas as well as the 

 shape of segments and reticulations are shown in the figure 

 of antenna more distinctly than verbal details could indicate. 



The wax pores of this species are more difficult to find than 

 on any of the other species recorded in this paper. Even in 

 specimens fairly well cleared the gland areas were not always 

 evident. However, from a large series of mounts of specimens 

 cut transversely giving the clearing fluids every opportunity, 

 the gland areas (Fig. 108) were found to be consistently as 

 follows: head with an area of two transverse groups on anterior 

 margin nearly coalescing, an area of two transverse groups at 

 posterior margin; prothorax with an irregular lateral area, a 

 median anterior area of two groups, and a row of 4 groups near 

 posterior margin; mesothorax with a lateral group on anterior 

 margin and a median area of two groups on posterior portion 



* Insects Injurious to Forest and Shade Trees. 



