CHAEACTEES DISTINGUISHING LARVAE OF POPILLIA, ETC. 5 



Habitat : Usually waste, sandy fields and dunes. 



Remarks: Difficult to distinguish from some specimens of Popillia japonica, 



but the punctation of the head and the characters of the raster are usually 



sufficient. 



PACHYSTETHUS LUCICOLA (Fab.) 



Length 23 mm. Form of Popillia japonica. 



Width of head 2.5 mm. 



Surface of head: Shining, finely reticulate. Occipital half of epicranial stem 

 an impressed line with feebly raised edges. Front uneven ; two paramedian 

 setose punctures near clypeal suture ; above these, on each side, 2 to 4 

 transversely placed towards middle curve of epicranial arm. 



Color of head : Pale dull yellow. 



Epipharynx (fig. 2) : Very similar to that of Strigodcrma arboricola, but sen- 

 sory hairs of epigusta finer and more numerous. No slender sclerotized 

 plate at right of epigusta. 



Raster (fig. 6) : Similar of that of Strigoderma arboricola, but the two para- 

 median rows of pointed spines more regular, diverging throughout, with 

 the individual spines longer, eight spines in each row. 



Anal slit : Transverse, arcuate. 



Vestiture: As in Popillia japonica, but small dorsal spines finer. 



Habitat : Under turf of pastures, lawns, and fields. 



Remarks: This grub is usually yellowish white throughout instead of being 

 darkened by the earthy contents in the ninth and tenth segments. The 

 V of the raster is longer than in P. japonica and the two sides are less 

 divergent. 



PELIDNOTA PUNCTATA (L.) 



Length 40 mm. Form rather stout. 



Width of head 6 mm. 



Surface of head : Mostly glabrous, faintly glossy, with extremely fine, confused, 

 shallow wrinkles. Epicranial stem narrow, dark, impressed. Epicranial 

 arms very fine, raised. Front rather finely, irregularly punctured ante- 

 riorly, the larger punctures with fine yellow setae. 



Color of head: A rather bright brownish ocher, darker anteriorly. 



Epipharynx (fig. 3) : Semicircular in outline. Sensory eminence with a curved 

 sclerotized plate, in center of which is a large short fixed spine. Scat- 

 tered below plate are several sensillae. Between inner ends of tormae 

 is a short angular chitinous bar; below this, several sensillae. Spines 

 along lateral margins of epipharnyx very short. 



Raster (fig. 7) : Hairs and spines all rather fine and sparse, of a blight rufous 

 color. 



Anal slit : Transverse ; sinuate as seen from end of grub. 



Vestiture: Dorsal surface of abdominal segments (exclusive of the tenth) 

 with very fine, short, and rather sparse brown hairs interspersed with 

 a few long hairs. 



Habitat: The decaying but still firm portions of old stumps, frequently maple 

 and poplar. Usually considerable numbers of these grubs, in various 

 sizes, are found in a single stump. 



Remarks: Feeding, as it does, upon decaying wood which is not much dis- 

 colored, this grub is not usually as dark posteriorly as are most scara- 

 baeid larvae. 



MACRODACTYLUS SUBSPINOSUS (Fab.) 



Length 15 mm. Form elongate, rather slender. 



Width of head 2 mm. 



Surface of head: Smooth, shining. Epicranial stem a fine depressed line. 

 Epicranial arms not apparent. Front with six scattered punctures. 



Color of head : Dull yellow clouded with rufous. 



Epipharvnx (fig. 2) : With a small apical lobe. Sensory eminence with an 

 oblong sclerotized plate towards the right side. Below this a triangular 

 plate at each end of the row of five sensillae. Four short, blunt fixed 

 teeth at proximal margin of eminence. The right torma angulately bent 

 at apical third. 



