256 DAVENPORT ACADEMY OF SCIENCES. 



at apex with minute teeth. Antennae very stout, the third joint 

 somewhat narrowed towards tip and somewhat scaly. Legs stout. 



Migratory female. — Closely related to both Ph. c.-spinuloides 

 and to Ph. spinosa, from the first of which it differs principally in 

 the structure of the antennae, and from the latter in the absence 

 of the two dark, oval spots at the end of the abdomen. 



Length of body 0.8-1. 6"""-; expanse of wings 2.6-3.4°'""-. 

 Color yellow ; head, meso- and metathorax and sternal plate dull 

 blackish. Sides of prothorax and three spots on its disc dusky, 

 the posterior one transverse and largest. Eyes red, ocelli color- 

 less, bordered at their inner side with black. Antennae and legs, 

 dusky, the legs palest. Antennae rather slender and very variable 

 in shape. Joint i stoutest, about as long as 2 and faintly scaly; 

 joint 2 about as long as wide or but slightly longer, rounded at 

 anterior end, its surface distinctly scaly ; joint 3 rather slender, 

 its basal section subject to the greatest variation, being either 

 extremely slender and scarcely half the usual diameter, or curved' 

 and bent in different directions, in which respect it is unlike any- 

 thing observed in this genus before. There is also considerable 

 variation in the serisorial' membranes, the basal one being often 

 almost completely obliterated, whereas the terminal one shows 

 more or less a tendency to divide into several independent 

 parts. In this respect it resembles Ph. c.-spinuloides. The whole 

 surface of this joint is always more or less distinctly scaly. Sur- 

 face of head and prothorax finely rugose, the rugae rather shal- 

 low- Wings rather large, pale fuscous ; the stigma and veins 

 darker ; the stigma with a more or less yellowish tinge. Vena- 

 ation normal and bordered with a dusky shade. 



Sexual eggs. — The sexual eggs are of two different sizes. 

 Those producing the males measure o.3""°-, and those producing 

 the females 0.4'""- in length. All are regularly ovoid, highly pol- 

 ished, faintly facetted and granulate and o£ a pale lemon-yellow 

 color. 



Male and female. — Length of male about 0.2"""-; of female 

 Q^mm. CqIoj. of both .sexes greenish-yellow, though the male is. 

 usually somewhat the darker. Eyes brownish, antennae and legs 

 pale dusky. Mouthparts wanting. 



Winter egg.— The length of the winter-egg is about 0.2"""-. 



