INSECT ENEMTES OF EASTERN FORESTS 
167 
KEY TO THE GENERA OF LAMELLICORN LARVAE IMPORTANT TO FORESTRY IN 
LO: 
12. 
13. 
14. 
15. 
16. 
EASTERN NORTH AMERICA—Continued 
Anal segment not trilobed on caudal aspect; stridulating organs on 
mandibles (except in one dung-inhabiting genus not included 
in key); anal pads normal, not conspicuous; labrum trilobed or 
not. In soil, decayed wood, manure, or litter. (Family Scara- 
ee oe 
- Left mandible bidentate or tridentate. In decayed wood of moist 
CS Se Seren Mr ENE RAGE eet SOLO) ON ents Ue ws Des Ceruchus 
itettrmandible pearing 400-5 teeth 9 22 ee 
Claw straight; 10T8 abdominal segment very hairy; left mandible 
with 5 teeth. In decayed wood of stumps and roots___Lucanus 
Claw curved; 10th abdominal segment only slightly hairy________ 
Left nvandible with 4 teeth. In decayed wood of moist logs 
Platycerus 
Left mandible with 5 teeth. In decayed wood of moist logs__Dorcus 
Raster with a pair of distinct, well-separated patches of spines; 
analeshitzoroadlve y-shapeda: wish oes 2 Uy ee 
Raster with spines in 1 transverse, 2 longitudinal or oblique rows, 
or, with setae, in a scattered arrangement, never in distinct 
TRONS chistes ieee cot ES i Pe Ug yee Nn Be eee rise ae eRe 
Setae present between anus and the paired patches of spines. In 
soil in open pine or hardwood stands, nurseries, pastures, ete. 
@Vilelolomitiaimae) res ee Seka ees as hes Dichelonyx 
Setae absent between anus and the paired patches of spines; spines 
in 2 or 3 overlapping rows and in V-shaped arrangement. In 
sandy soil of pine stands, nurseries, etc. (Melolonthinae) 
Diplotaxts 
Spines in | transverse or 2 longitudinal rows__________----_----- 
Spines, with setae, in a scattered arrangement______________-___- 
Spines semicircularly arranged in 1 transverse row___-_______--- 
SpimespneZeloneitudimaloroblique rows 222225822 225 ee 
End of third pair of legs with short, blunt claws. In soilin gardens, 
fields, lawns, etc. .((Melolonthinae)________________ Autoserica 
End of third pair of legs with long spinelike claws. In soil of hard- 
wood stands, pastures, gardens, lawns, etc. (Melolonthinae) 
Serica 
Anal slit transverse and sinuate, or V- or Y-shaped; free margins of 
upper anal lip obtusely or acutely projecting_---..______---_- 
Anal slit transverse and arcuate; free margin of upper anal lip con- 
Anal slit with lobes at each end; free margins of upper anal lip ob- 
tusely projecting; free margin of lower anal lip entire and covered 
with several irregular transverse rows of hooked setae; spines of 
raster 8 to 12 on each side, irregularly placed, single toward head, 
2 or 3 together toward caudalends. In sandy soil nurseries, pine 
Stameseetcca. (Miclolonthimnae)io. = 22 o nie ese eu Polyphylla 
Anal slit V- or Y-shaped; free margin of upper anal lip sharply pro- 
jecting; free margin of lower anal lip inflected at the end of a 
median longitudinal groove on the lip, which may or may not 
have a single transverse row of hooked setae_____------------- 
Claws of third pair of legs much longer than the claws of the first 
and second pairs of legs. In soil of hardwood stands, pastures, 
nurseries, lawns, etc. (Melolonthinae)__._-------_- Phyllophaga 
Claws of third pair of legs equal in length to the claws of the first 
and second pairs of legs. In sandy soil of serub oak uplands, 
gardens, nurseries, lawns, etc. (Melolonthinae) -- Macrodactylus 
Epipharynx with a single large chitinous tubercle on distal area__ 
Epipharynx with 3 or 4 sharp, pointed teeth on the distal area 
rather thianvasimelelanrge tubercle. 2 5==-==22-55_—=-2 == ee eg 
Antenna with a distinct ocellar spot at base; labrum not distinctly 
trilobed, and almost as long as wide. In decayed wood, espe- 
Cialllvyahardwood. ) Cbrichinae) = 225522522" = =s2== Trichiotinus 
13 
14 
16 
17 
