246 bAVENPORt ACADfeMY Ot SCIENCES. 



smaller round spot usually occurring each side of it, and broad 

 anterior angles, all dusky. Anal part marked with two generally 

 quite distinct, oval, orange spots which turn brown or black in 

 specimens mounted for some time in balsam. Eyes brown, ocelli 

 clear. Head black, its posterior portion usually yellow. Pro- 

 thorax finely but rather densely rugose. Antennae, mesothorax 

 and sternum black. I^egs and wings dusky. Wings large, broad; 

 the subcosta, stigma and veins darker, the latter with a brownish 

 shading on each side. Coursie of veins normal, the stigmal vein 

 straight, connecting near tlie base of the stigma. Antennae rather 

 slender, the first joint stoutest and somewhat longer than wide, 

 not, or but faintly, annulate ; the second slightly shorter, nar- 

 rowest at base, rounded at apex, divided by five or six scaly annu- 

 lations ; the third slender, its upper half scaly and the lower half 

 annulate and more or less distinctly scaly ; basal portion of the 

 joint considerably constricted above the basal sensorium ; anterior 

 sensorium about one-half the length of the joint, the basal one 

 small and round. 



Ph. spinosa Shimer is evidently but a variety and more numer- 

 ous than the typical form in localities where the pubescent-leaved 

 species of Hickory prevail. It is often considerably larger than 

 the typical form and is always more or less covered with short, 

 fleshy spines. It closely resembles, also, c.-spinuloida, which, 

 however, is still more densely covered with longer and more slen- 

 der spines. The more striking differences are, however, notice- 

 able in the migratory females, which in carycecaulis have shorter 

 and broader wings, different antennal characters, comparatively 

 longer legs and the two oval orange or blackish spots at the end 

 of the body. 



Ph. c.-magna Shimer (Trans. Am. Knt. Soc, 2, p. 391) may 

 also be considered as a variety of caiycscaulis. The form is found 

 in Missouri growing on the petioles and bases of the leaflets of 

 Hicoria amara. Some of the specimens also closely resemble those 

 of subelliptica Shimer, which probably belongs to it, but of which 

 I have not yet succeeded in obtaining the migratory form. On 

 account of some slight differences in the gall, which are no doubt 

 due to the specific differences of the infested trees, c.-magna may 

 perhaps be allowed to remain under a variety name, though the 



