121 
DESCRIPTION OF GRUBS. 
Until the publication of the Seventeenth Report from this office no 
- distinguishing larval characters had been recognized for the larve of 
Lachnosterna, and even Cyclocephala had not. been separated in the 
larval state from the other genera. It has not yet proven possible to 
find strict specific characters for the Lachnosterna larve, the distin- 
guishing features recognizable being rather those of groups than of spe- 
cies. ‘Three such groups have thus far been recognized among larve 
subsequently bred, first represented by hirlicula and rugosa, the second 
by fusca and inversa, and the third by gibbosa. 
Genus Cyclocep The tip of the abdomen and the summits 
of the folds on the backs of segments four to nine are crowned with 
short brown hairs, not thickly set. Segments one to nine are short, ten 
and eleven are equal and twice as long as nine, twelve is more than 
three times as long, and segment thirteen is very short and followed by 
a large round anal plate which attains the tip of the abdomen. The 
anal slit is transverse. The hairs on the ventral surface of the last seg- 
ment are uniform and irregularly scattered. The front and clypeus are 
a little roughened, the labrum somewhat more so; the mandibles shght- 
ly sulcate. 
C. immaculata (Plate XII., Fig. 8; and Plate XIII, Fig. 1 and 
2).—The body of this species is cream-colored, and is covered with 
scattered soft brown hairs; the spiracles are orange; the head is fer- 
Tuginous, with a short longitudinal brown line behind the usual frontal 
_ V, and a black dot at the base of each mandible. The first joint of the 
antennze is globose, the second is cylindrical, three times as long as the 
first, swollen near the distal end, the third is longest of all, the fourth 
shorter and prolonged into a short tooth anteriorly on the under side, 
the fifth as long as the second and tapering to a point. 
Genus Dgenncsorna. —Body covered with soft brown hairs, the 
tip of the abdomen and the summits of the folds on the backs of seg- 
ments four to nine covered with short stiff hairs, thickly set. The spir- 
acles are ferruginous. Segments one to nine are short, ten and eleven 
are equal in length, twelve is one half longer than eleven, thirteen still 
longer than twelve, and the anal plate is small, triangular, anterior 
margin rounded, not attaining the tip, the anal slit consequently angu- 
lar. On the ventral side of segment thirteen is a triangular patch of 
conspicuous brown hairs, the outer of which are simple and pointed, 
the inner flattened and hooked at the tip, with a median double row 
of mucronate hairs, inclined inwardly, extending lengthwise through 
the middle of the patch. The mandibles are sulcate above, the anten- 
nal emis variable. 
fusca and inversa (Plate XII., Fig. 5)—In these larve the 
Aaa spines or hairs are relatively short and weak, the greater part 
of the hairs being hooked, these hooked hairs forming a large triangu- 
lar patch on each side of ‘the middle line, extending ‘outward as far as 
the ends of the anal slit. The spinules of the double median row are 
scarcely thicker or more conspicuous than the hooked: hairs adjacent. 
The two rows are parallel, extend about two thirds the length of the 
ventral surface of the segment from the anal slit forward, and are sep- 
