256 RHYNCHOPHORA. [Orchestes. 



them and there undergo their transformations; they easily cut through 

 the enclosing portion of leaf and appear in large numbers in the perfect 

 state on the outer side of the leaves of the trees. 



I. Posterior femora more or less diluted, often dentate 

 on their underside ; chest and side pieces pubescent ; 

 size larger. 



i. Funiculus of antennae with six joints (Orchestes, 

 i. sp.). 



1. Sides of elytra in front with a row of erect 

 settc, independent of the general pubescence ; 



sides of thorax with outstanding setae. 



A. Scape of antenna? comparatively long, inserted 



a little behind middle of rostrum. 



a. Thorax with a more or less distinct longi- 

 tudinal central furrow ; colour red or 

 brownish-red 0. QUERCUS, L. 



b. Thorax without a central furrow. 



a*. Elytra red or yellowish-red with black 



spots ; femora and tibiae black .... 0. ALNI, L. 



b*. Elytra unicolorous red; femora and 



tibiae in part or entirely yellowish-red . 0. ALNT v. FERRUGINKUS, 



Marsh. 



c*. Elytra dark, closely covered with varie- 

 gnted grey, white, and blackish hair-like 

 scales, and with a whitish patch at scu- 

 tellum O. ILICIS, F. 



B. Scape of antennae shorter, inserted between 

 the base and the posterior third part of the 



rostrum ; thorax black. 



a. Elytra black with a clear white spot at base 0. IOTA, F. 



b. Elytra with raised black hairs which are 

 visible if viewed sideways, variegated with 

 very obscure bands of grey, and with a yel- 

 lowish-white spot at scuteliuui; form longer; 



antennae and tarsi red O. SPARSUS, Fahrs. 



c. Elytra with the pubescence even, strongly 

 variegated with white hair-like scales which 

 cover nearly the whole basal portion ; form 

 shorter; antennae, tibia? and tarsi reddish- 

 yellow O. AVELLAN.E, Don. 



2. Sides of elytra without a row of erect setae in 



front. 



A. Thorax with outstanding setae at sides ; upper 

 surface red, elytra with a spot at shoulders and 



a broad band in middle brown or black-brown (0. LONICER.K, Herbst.) 



B. Thorax without outstanding setse at sides. 

 a. Elytra not variegated. 



a*. Scape of antennae longer, inserted just 

 behind the middle of the rostrum ; body 

 black covered with brown pubescence . . 0. FAGI, L. 

 b*. Scape of antennae shorter, inserted to- 

 wards base of rostrum. 

 a+. Body red or reddish covered with 

 light silky yellowish pubescence ; an- 

 terior coxa) contiguous (Threcticus, 

 Thorns.). 



