OKCHESTES. 155 



B S. Abdomen black ; posterior femora with 

 only one distinct tooth. 



Upper-side rather darker than in 0. quercus ; eyes, apex 

 of rostrum and under-side (except of head) black ; scu- 

 tellum closely covered with white hairs. L. 1-| — 1| 1. 

 Moderately common. 0. scutellaris, Gyll. 



2, Elytra red, with a small round spot in middle 

 of base and a large common spot somewhat 

 behind middle black ; head black. 



Black ; thorax, apex of abdomen and tarsi yellow-red, 

 elytra as above ; pubescence gray. Posterior femora finely 

 sawlike beneath. L. 1^ 1. Common. 0. alni, Lin. 



In variety ferrugineus, Marsh., the elytra are unicolorous 

 red. 



II, Thorax black. 



1, Elytra without white spot at base of suture. 



A A, Pubescence on elytra arranged in markings. 



a a. Elytra closely checkered. 



Oblong oval. Black; antennae and tarsi red-yellow; 

 closely checkered with whitish, gray and reddish hairs. 

 Posterior femora large, sawlike beneath. L. IJ 1. Mode- 

 rately common. 0. ilicis, Fab. 



6 h. Elytra with indistinct wdiite bands and a 

 quadrangular common red-brown spot behind 

 scutellum. 



Nearly ovate. Black ; antennae and tarsi reddish-yellow ; 

 under-side with scanty gray pubescence ; rostrum with a 

 bare, shiny central line, thorax with yellow-gi^ay pubes- 

 cence and sprinkled with longer black hairs, elytra with 

 black recumbent hairs, indistinctly banded with white 

 pubescence, with a quadrangular common red-brown spot 

 behind scutellum. Posterior femora with a row of indis- 

 tinct teeth beneath. L. 1;^ 1. Pare. 0. sparsus, Gyll. 



J3 J3, Pubescence on elytra uniform. 



a a. Striae on elytra distinctly punctured, 

 length 11 lines. 



Elongate oval. Black, antennae and tarsi light yellow- 

 brown ; thinly covered throughout with fine gray pubes- 



