40 



EE The anterior coxae separated from the head by a very short 



prosternum; the tibiae margined with long slender teeth on 



the outer side. Pseudocryphalus Sw. Page 57 . 



BB The third foretarsal segment distinctly widened and emarginate or 



bilobed (PL 12, fig. 1). 



C The antennal club unsegmented, the funicle attached to side of 

 club (PI. 10, fig. 36); beak extremely short, antennal scrobes 

 circular, attaining the eyes; eyes entire; shape of body hump- 

 backed (PI. 9, fig. 28) ; pronotum much wider than long, strongly 

 scabrous on the sides; elytra with declivity oblique, continuing 

 the curve of the disc, the pubescence on the elytra of short scale- 

 like hairs and stout bristles (PL 9, fig. 28a). 



Chramesus Lee. Page 58. 



PLATE 9. 

 IPID STRUCTURES; ALL MUCH ENLARGED. 



Fig. 1, Orthotomicis caelatus Eichh., labium.* 



Fig. 2, Hylurgops pinifex Fitch, egg.* 



Fig. 3, Dendroctonus valens Lee., egg.* 



Fig. 4, Gnathotrichus materiarius Fitch, labium.* 



Fig. 5, Hylurgops pinifex Fitch, tarsus, showing wide and bilobed 3rd segment.** 



Fig. 6, Xyloterinus politus Say, labium.* 



Fig. 7, Micracis suluralis Lee., labium.* 



Fig. 8, Anisandrus populi Sw., labium.* 



Fig. 9, Pityogenes hopkinsi Sw., labium.* 



Fig. 10, Trypodendron retusus Lee., labium.* 



Fig. 11, Anisandrus minor Sw., maxilla.** 



Fig. 12, Ips pini Say, maxilla.** 



Fig. 13, Ips calligraphus Say, labium.* 



Fig. 14, Dryocoetes septentrionis Mannh., labium.* 



Fig. 15, Pterocyclon mali Fitch, tibia and tarsus.** 



Fig. 16, Eccoptogaster picece Sw., fore tibia, lower face.** 



Fig. 17, Eccoptogaster picece Sw., fore leg, tarsus retracted.** 



Fig. 18, Hylastes, a portion of the tarsus showing emarginate 3rd segment.** 



Fig. 19, Xyloterinus politus Say, metepisternum.* 



Fig. 20, Pityophthorus, metepisternum.* 



Fig. 21, Trypodendron retusus Lee., metepisternum.* 



Fig. 22, Xyloterinus politus Say, showing divided eyes.** 



Fig. 23, Phthorophloeus picece Sw., tibia and tarsus.** 



Fig. 24, Pseudopityophthorus minutissimus Zimm., fore leg.** 



Fig. 25, Leperisinus aculeatus Say, venter of abdomen.** 



Fig. 26, Hylurgops pinifex Fitch, venter of abdomen.** 



Fig. 27, Xyleborus celsus Eichh., labium.* 



Fig. 28, Chramesus icoriae Lee., side view.** 



Fig. 28a, Chramesus icoriae Lee . . dorsal view.** 



Fig. 29, Conophthorus coniperda Sz., labium.* 



Fig. 30, Hylastes sp., dorsal view of head and pronotum.** 



Fig. 31, Hylurgops pinifex Fitch, dorsal view of head and pronotum.** 



Fig. 32, Pterocyclon fasciatum Lee., labium.* 



Fig. 33, Trypodendron bivittalum Ky., hind tibia and tarsus.** 



Fig. 34, Trypodendron betulae Sw., hind tibia and tarsus.** 



Fig. 35, Hylurgops pinifex Fitch, side view of mesosternal process.* 



Fig. 36, Polygraphus rufipennis Ky., side of head; male.** 



Fig. 37, Dendroctonus pseudotsugae Hopk., epistomal process.* 



Fig. 38, Dendroctonus valens Lee., epistomal process.* 



Fig. 39, Dryocoetes americanus Hopk., prosternal process.** 



Fig. 40, Anisandrus minor Sw., prosternal process.** 



Fig. 41, Ips concinnus Mannh., labium, side view.* 



Fig. 42, Hylurgops pinifex Fitch, labium.* 



Fig. 43, Stephanoderes dissimilis Zimm., labium.* 



""Original. ** Author's illustration. 



