i88 A NATURALIST IN THE GREAT LAKES REGION 



In L. pnlchella the mask covers the most of face in the 

 nymphs; there is but a single median tooth on its median lobe. 

 The adult is (Fig. 211) dark brown to black with two wide green 

 stripes on each side of the thorax and one on each side of the 

 abdomen. The triangle of both fore and hind wings is colored 

 dark; in the front wing its long axis is at right angles to the 

 long axis of wing (July- August). 



Electric-light bugs or waterbugs, both 

 great and small, water boatmen, back 

 swimmers and diving beetles, all on 

 Fig. 212, A and B, are numerous. The 

 six-lined diving spider (Fig. 213) is com- 

 mon on the bulrushes. The common 

 pond snail {Lymnaea reflexa) is very 

 abundant, as are also two of the flat 

 snails, Planorhis canipanulatus and Pla- 

 norhis parvus. In the waters of such 

 ponds one will frequently dredge out 

 many of the little efts, Diemictylus 

 viridescens (Fig. 214). In the bulrush 



hi i ul J Aw .1 T zone and farther back among the low 



Fig. 213.— The diving shrubs the large garden spider (Fig. 215) 



spider, Dolomcdcs sexpnnc- |^^-|^g j^g orb-shaped webs in the 



Uitus. After Shelford. 



summer. 



In the late summer the margins of such ponds and swamps are 



alive with grasshoppers and their kind, whose stridulations are 



incessant in such a location. Earlier in the season the grouse 



locusts have had their day. They are small animals, less than 



. 5 inch long. Tettix granulatus (Fig. 216) is moderately slender, 



while the others have heavy bodies. Tettigidea armata and 



T. parol pennis were common; T. lateralis rare. The figure 



of T. lateralis is given in Fig. 216. T. parvipennis is much 



like it, but the middle joints of the antennae are less than 



three times as long as wide, while in T. lateralis they are more. 



T. armata has the front margin of the thorax (pronotum) extend- 



