FIELD BOOK OF INSECTS. 



Prioninse 



These are among our large beetles, and some tropical 

 species attain a length of six inches or more. The adults 

 are nocturnal. 



1. Form elongate; antennae u-jointed, the joints not 

 overlapping; width of pronotum more than twice its length, 

 three sharp teeth on each side; length, from I to 1.7 in.; 

 light chestnut-brown, shining. Larvae in oak (and other?) 

 stumps and logs Orthosoma brunneum. 



Form, stout, broad; antennas (in our species) 12- to 

 2O-jointed, the joints, especially in males, more or less 

 overlapping each other. Prionus. Length from .9 to 

 2 in. ; shining reddish-brown or black 2. 



2. Antennae with 16 to 18 joints in the female and 18 to 

 20 in the male; pronotum very short and broad, its teeth, 

 especially the hind ones, not very distinct 



Prionus imbricornis. 

 Antennae with only 12 joints 3. 



3. Elytra, combined, at base not wider than the pronotum ; 

 all joints of the hind tarsi densely pubescent beneath; 

 antennae of male longer than the body, of female about 

 half the length. (Plate LXXXII.) The larvae live in 

 the roots of many trees and shrubs, including orchard 

 trees and small fruits such as blackberry; they are three 

 years in reaching maturity Prionus laticollis, 



Elytra, combined, at base wider than the pronotum; 

 basal joint of each hind tarsus nearly smooth. Middle 

 and Southern States Prionus pocularis. 



Cerambycinae 



Quite a few of the very many species are pretty and 

 sure to attract attention. 



1. Base of antennae not enveloped by the eyes 2. 



Base of antennae partly enveloped by the eyes; head 



inserted in the thorax 8. 



2. Front coxae transverse, not prominent; antennae 

 with second joint rather large, one- third or more the length 

 of the third; head inserted in the thorax. (Division 

 Callidioides) 3. 



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