288 THE CANADIAN ENTOMOLOGIST 



angles, which are carinate in both sexes, sinuous when viewed 

 laterally; disc convex with two shallow, median depressions, one 

 near the base and the other near apex, and with deep, prominent 

 lateral depressions ; surface coarsely, transversely rugose, with fine, 

 indistinct punctures between the strigae. Scutellum transversely 

 carinate, surface very finely granulate. Elytra slightly sinuate be- 

 hind the humeri, dilated behind the middle, and slighth' sinuate 

 near the apex, which are separately rounded and serrulate; disc 

 slightly flattened, basal impressions large and deep, reaching from 

 the scutellum to humerus, surface closely imbricate-granulate, 

 without any trace of costae. Body beneath of same colour as 

 above but more shining, finely, transversely strigose, and sparsely 

 clothed with fine, short, white pubescence; prosternal lobe slightly 

 emarginate; intercoxal process broad, slightly narrowing to apex. 

 Pygidium wdthout a projecting carina. First joint of hind tarsi 

 as long as the next three joints united. Length 6-9 mm.; width 

 1.75-2.50 mm. 



ikf^Ze.— Front densely punctured and pubescent. Prosternum 

 densely punctured and hairy. Claws of anterior and middle feet 

 cleft near the apex, nearly bifid; posterior claws cleft at middle, 

 forming a broad tooth. 



Female.- — Front more shining and less densely pubescent. 

 Prosternum sparsely pubescent. Claws of all feet cleft at middle, 

 forming a tooth. 



Habitat. — Placerville, California. 



Type, allotype and paraty pes. —Cat. No. 21386, U. S. N. M. 



Described from a large series of specimens recorded under 

 various Bureau of Entomology, Hopk. U. S. Numbers. These 

 specimens have been reared by Mr. H. E. Burke from material col- 

 lected at various times by himself, J.J. Sullivan and F. B. Herbert. 

 The larvae of this species mine in the inner bark and W'Ood of normal, 

 injured, and dying white alder (Alnus rhombifolia) , and paperleaf 

 alder {Alnus tenuifolia) . 



This species is closely allied to politns but differs from it 

 chiefly in colour and habits. Horn in his Revision of the genus 

 Agrilus (Trans. Amer. Ent. Soc, XVIH, p. 316, 1891) places all 

 the brassy green or blue forms under LeConte's name desertus,- 

 which is preoccupied and which has been renamed solitarius by 



