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First joint of hind tarsi scarcely pecan gall formers 
Ont AIdeis4 ix uk. eonen |. Renee cine Eupristocerus 
First joint of hind tarsi as long as 8 following joints 
Agrilus 
Tarsi over half as long as tibiae ... _... Paragrilus 
Tarsi;zmuch/ shorter than tibiaet 4. 2.) re ees eee 
Scutellum large; larvae leaf miners in certain leguminous 
plants 1c. Datos. ae oro Pachyschelus 
scutellum:smiall: aus)! ar} See ve Carre ee eee 
Prosternum with posterior cavity; larvae leaf miners in 
Various species of. oak =... e a eee Brachys 
Prosternum without cavity; leaf miners in Scirpius and 
Other: alliediplan ts pecs werimte renee ene iete tian neti Taphrocerus 
Antennal pores scattered on both faces of serrate joints 
Antennal pores concentrated in pits on these joints ... 
Apical 1 of elytral margin entire, or finely serrate; 
borers in pine stumps and logs _.................Chalcophora 
Apical 14 of elytral margins strongly serrate; borers in 
hardwood trunkse. = ee ... Chaleophorella 
Front not narrowed at insertion of antennae; eyes 
scarcely approaching, often distant on vertex . 
Front narrowed at insertion of antennae; eyes oblique, 
close together on vertex _.. 
Prosternal spine obtusely angulated behind prothracic 
coxae; epimera of metathorax not covered by abdomen 
Prosternal spine acutely angulated behind prothoracic 
coxae; epimera of metathorax partly concealed by 
abdomen ...... 5 ee 
Prosternal spine obtusely rounded at apex. 
Prosternal spine acute at apex; larvae heartwood borers 
in oak and ironwood . : if | Cinyra 
Mentum entirely corneous: | 
Anterior edge of mentum coriaceous Buprestis 
Elytra striate ...... es 
Elytra not striate . Trachykele 
Scutellum small, round, oval | se Dicerca 
Scutellum large, trapezoidal; pronotum with smooth 
median line _.. Poecilonota 
Anterior edge of mentum coriaceous Melanophila 
Mentum entirely corneous 
Base of thorax trucate . | 
Base of thorax sinuate Xenorhipis 
Last ventral segment of abdomen punctured like the 
segments preceding _.. Anthaxia 
Last ventral segment of abdomen much more densely 
punctured than the preceding segments Agrillaxia 
Hind tarsi with lst joint considerably longer than 2nd; 
3rd joint not prolonged at sides; sapwood and bark 
borers Chrysobothris 
Hind tarsi with 1st joint only slightly longer than 2nd; 
38rd joint prolonged at sides; heartwood borers in 
various hardwoods Actenodes 
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