FLAT-HEADED BORERS AFFECTING FOREST TREES. 5 



faces; true legs wanting; ambulatory tubercles sometimes present; 

 cerci wanting; spiracles crescentic, one large one on either side of the 

 second segment and one small one on either side of each of the fourth 

 to eleventh segments, on the anterior dorso-lateral surface. 



Key to Genera of Buprestid Larvae.' 



1. First segment distinctly larger and broader than the following segment; 



larva dublike or pestlelike in form, somewhat flattened ; bark and 



wood miners (PL I, fig. 1) 2 



First segment only slightly broader or slightly narrower than the following 

 segment; larva slightly wedge-shaped (cuneiform) or spindle-shaped 

 (fusiform), much flattened; segments deeply notched and lobed; 

 leaf-miners (PL VI, figs. 3, 4) 19 



2. Last segment without a distinct chitinous fork (PL I, fig. 1) 3 



Last segment with a distinct chitinous fork (PL VI , figs. 1, 2) 18 



3. Plates of first segment with distinct chitinous rugosities (PL I, fig. 1) 4 



Plates of first segment without distinct chitinous rugosities, surface some- 

 times dull, sometimes shining (PL TV) _ 8 



4. Rugosities of first segment strongly developed, tending to form ridges; 



plates with rather definite margins, markings dark and distinct (PL 



X fig. 1) , , 5 



Rugosities of first segment pointlike; plates with indefinite margins, mark- 

 ings light, appearing more as grooves than as definite lines (PL I, 

 figs. 3, 4) . ... 6 



5. Dorsal plate marked by a distinct inverted Y (PL I, fig. 1) Chalcophora. 



Dorsal plate marked by a distinct marking more like an inverted V or U 



than a Y (PL I, fig. 2) Chalcophorella. 



6. Dorsal plate marked by a short, trunked, inverted Y or U , the apex and trunk 



of which are often faint, rugose area forming more or less of a hood 

 around the Y ; ventral plate marked with a median groove that ex- 

 tends from the posterior margin of the plate two-thirds or three- 

 fourths of the distance to the anterior margin, not bisecting the 



plate (PL I, figs. 3, 4; PL II, fig. 1) Buprestis. 



Dorsal plate marked by an inverted V formed from light grooves; ventral 

 plate marked with a median groove that extends from the anterior 

 margin backward, sometimes bisecting the plate (PL II, fig. 3) 7 



7. Dorsal plate rather oblong; ventral plate quite narrow, almost rectangular, 



completely bisected by a median groove; first segment not much 

 larger than the second and third, fourth segment as large as the fifth 



(PL II, figs. 2, 3) . . . . Mclanophila. 



Dorsal plate circular; ventral plate circular, never completely bisected by 

 the median groove, which extends backward from the anterior margin 

 about two-thirds of the distance to the posterior margin; first seg- 

 ment much larger than the other segments, fourth smaller than fifth 

 (PL II, fig. 4; PL III, fig. 1) Chrysobothris. 



8. Dorsal plate marked by an inverted V or Y formed of lines or grooves (PL 



III, fig. 2) 9 



Dorsal plate marked by a single median line or groove which may broaden 



out at either end (PL IV, fig. 3) 13 



9. Dorsal marking an inverted V of deep grooves, ventral line not bisecting 



plate, third segment with a pair of ambulatory tubercles above and 



below, surface shining (PL III, fig. 2) Anihaxia. 



Dorsal marking an inverted V or Y of dark lines, ventral line bisecting plate, 



surface rather dull (PL IV, fig.2) 10 



10. Both dorsal and ventral markings with narrow simple anterior ends (PL 



III, figs. 3,4) 11 



Both dorsal and ventral markings with broad reticulated anterior ends (PL 



IV, figs. 1,2) 12 



11. Dorsal marking a long trunked inverted Y with a brownish base, ventral 



marking a straight bisecting line with a brownish anterior end (PL 



III, fig. 3) Cinyra. 



Dorsal marking an inverted V with a simple apex, ventral marking a simple 



bisecting groove (PL III, fig. 4) Poecilonota. 



i So far as determined the characters used in the key hold for larvse of any stage. 



