47 
LIST OF ILLINOIS SPECIES. 
There are thirty-one species of white grubs belonging to 
:he genus Lachnosterna credited to Illinois by the collection of 
die adults, twenty-one of which (marked with a star) are in my 
iwn office collections. The habits of the larvae of these species 
ire so far as known practically identical, but the greater part 
if them have of course never as yet been bred separately to 
]he imago. 
L. lanceolata, Say* Rare, Central and Southern Illinois. 
L. prsetermissa, Horn.* Rare, Southern Illinois. 
L. glaberrima, Blanch. Rare, Illinois. 
L. ephilida, Say.* Frequent, Southern Illinois. 
L. longitarsus, Sayy Infrequent, Illinois. 
S L. gibbosa, Bunn.* Abundant throughout State. 
L. hirtiventris, Horn.* Rare, Central Illinois. 
L. congrua, Lee.* Infrequent, Illinois. 
L. prunina, Lee. Rare, Northern Illinois. 
L. crassissima, Blanch.* Infrequent, Central Illinois. 
*L. inversa, Horn.* Abundant throughout State. 
L. micans, Knoch.* Infrequent, Central and Southern Illinois. 
L. arcuata, Smith.* Rare, Southern Illinois. 
L. dubia, Smith.* Not common, Central and Northern Illinois. 
L. insperata, Smith. Rare, Northern Illinois. 
V L. fusca, Froh.* Abundant throughout State. 
L. grandis. Smith. Rare, Illinois. 
L. marginalis, Lee. Rare, Illinois. 
^L. fraterna, Harr.* Frequent, Central and Southern Illinois. 
L. nova, Smith.* Rare, Central Illinois. 
L. corrosa, Lee. Raie, Illinois. 
-HL. rugosa, Mels.* Common, Central Illinois. 
^L. implicit a, Horn.* Frequent, Central and Northern Illinois. 
L. balia, Say.* Infrequent, Central and Northern Illinois. 
L. villifrons, Lee. Infrequent, Northern Illinois. 
L. limula, Horn. Rare, Illinois. 
*L. hirticula, Knoch.* Abundant throughout State. 
>L. ilicis, Knoch.* Common throughout State. 
L. crenulata, Froh.* Infrequent throughout State. 
L. inepta, Horn.* Rare, Southern Illinois. 
' L. tristis, Fabr.* Abundant throughout State. 
The following species will probably be found to occur in Illi¬ 
nois: L. gracilis , Burm., (Can. to N. C. and Tex.); L. affinis , 
Lee., (D. C., Kan., Col., Ind. Terr., and Tex.); and L. knochii, 
Gyll., (Mass, to Ga., Kan., and Tex.). 
Key to the Illinois Species of Lachnosterna * 
The classification of the June beetles presents unusual difficulty because 
of their general uniformity of appearance and the large number of spe¬ 
cies, so that extensive use must be made of the sexual characters, external 
and internal. This difficulty reaches a climax in the group of species al- 
* Prepared by Mr. C. A. Hart. 
