139 
L. hirticula and rugosa (Plate XII., Fig. 2 and 3).—In this 
group the median rows of mucronate spinules are much more 
prominent than in the preceding, the bases of the spinules being 
decidedly thicker than the hairs adjacent, and the spinules placed 
much more closely in a row (almost in contact), the rows being 
decidedly shorter—about half the length of the ventral surface 
of the segment—and stopping short of the anal slit. The rows 
are also further apart—a distance about twice the length of a 
spinule. The hooked hairs are fewer and more spai sely placed. 
Spinules about twenty-nine in a row. 
L. gibbosa (Plate XII., Fig. 7).—A much smaller larva than 
the preceding, characterized by a still greater shortening of the 
median avenue through an approximation of the hairs and a 
lateral thickening of their bases, these now becoming at least 
twice the diameter of the hairs adjacent. Tips of the spinules 
strongly inclined, nearly meeting in the middle, spinules of each 
row contiguous. The rows approximate at the ends, and ex¬ 
tend about one third the length of the ventral surface of the 
segment. Patch of hooked hairs much reduced in size, not reach¬ 
ing ends of anal slit, but extending farther forward than the 
ends of the rows of spinules. 
LIST OF ILLINOIS SPECIES OF LACHNOSTERNA. 
There are thirty-two species of white grubs belonging to the 
genus Lachnosterna credited to Illinois by the collection of the 
adults, twenty-six of which (marked with a star) are in my office 
collections. The habits of the larvse of these species are so far 
as known practically identical, but the greater part of them 
have of course never as yet been bred separately to the imago. 
L. lanceolata, Say * Pare, Central and Southern Illinois. 
L. prsetermissa, Horn* Rare, Southern Illinois. 
L. glaberrima, Blanch. Rare, Illinois. 
L. ephilida, Say* Frequent, Southern Illinois. 
L. longitarsus, Sav.* Infrequent. Illinois. 
L. gibbosa. Bur ml* Abundant throughout State. 
L. hirtiventris, Horn.* Rare, Central Illinois. 
L. congrua, Lee.* Infrequent, Illinois. 
L. pruina, Lee.* Rare, Northern Illinois. 
L. crassissima, Blanch/' Infrequent, Central and Southern 
Illinois. 
L. inversa, Horn.* Abundant throughout State. 
L. bipartita, Horn* Infrequent, Southern Illinois. 
L. micans, Knoch* Infrequent, Central and Southern Illi¬ 
nois. 
L. arcuata, Smith.* Rare, Southern Illinois. 
L. dubia, Smith* Not common, Central and Northern Illi¬ 
nois. 
L. insperata, Smith* Rare, Northern Illinois. 
L. fusca, Frohl* Abundant throughout State. 
L. grandis, Smith. Rare, Illinois. 
