156 THE ORDER OF COLEOPTERA. 



The following are the genera of Lepturides : 



A. Wing-cases of ordinary length. 



B. Antennae knotted, each joint being abruptly enlarged at its extremity Desmocerl'b. 



B B. Antennae uniform. 

 C. Eyes entire. Antennse approximate, and at some distance from the eyes. 



D. Body oblong, depressed, parallel ; elytra with elevated lines Rhagium . 



D D. Body short and broad, mesosternum prominent, elytra blue Gaueotes. 



D D D. Body oblong and moderately tapering ; thorax -without tubercles on the sides : 



ACSLEOPS. 



C C. Eyes with a very shallow notch. 



E. Hind tibise with a square excavation at the extremity, and with two long spurs at the up- 

 per angle. Shoulders much elevated, elytra tapering ToxOTUS . 



E E. Tibial spurs moderate and terminal, or sub-terminal. Thorax with obtuse tubercles on 



the sides. Body moderately tapering Pachxta. 



E E E. Body elongate slender, parallel; color blue Exctclops. 



C C C. Eyes with a distinct notch ; antennae inserted close to the eyes. Thorax bell-shaped and 

 without tubercles on the sides. First joint of hind tarsi without brush beneath. 



P. Body moderately elongated Leptuea. 



F. Body much elongated; abdomen much narrowed at its extremity Straxgalia. 



A A. Wing-cases imperfect. 



G. Wing-cases very short Mulorchus. 



G G. Wing-cases nearly as long as abdomen, but slender and separated at their extremi- 

 ties Stenopterus . 



Desmocerus, Serv., contains two species, found on the blossoms of 

 elder, one of which inhabits the Eastern States, and the other is found 

 on the Pacifi'' slope. The former is the B. palliatus, of Forster, a beau- 

 tiful blue insect, eight or nine-tenths of an inch in length, with the 

 basal third of the elytra a light bufi'-yellow, suggesting the idea of a 

 cloak thrown over the shoulders, and expressed by the specific name 

 palliatus. Acmceojys, Lc, contains thirty-two described species ; Toxo- 

 tus, Serv., nine 5 Pachyta, Serv., eleven ; Strangalia, Serv., seven ; and 

 LejJtura, Linn., seventy-six, besides eleven other species separated by 

 LeConte under the generic name Typocerus. The other genera contain 

 but few species each. The Ehagium lineatuni, Oliv., is five or six- tenths 

 of an inch long, and of a grayish color. The larvse burrow between the 

 bark and the wood of the pitch-pine. Garrotes cyanijjennis, Say, is be- 

 tween four and five-tenths of an inch long. The head and thorax are 

 brownish-black, with an obscur^ tint of purple; the elytra are much 

 broader than the thorax, and of a metallic greenish-blue color. The 

 Encyclops eoeruleus, Say, is a small, narrow, linear species, of a dark- 

 blueish color, with reddish eyes. The eyes, as implied by the generic 

 name, are perfectly round and without notch. 



Sub-family LAMnDES. 



This sub-family is named from the genus Lamia, of Fabricius, a Greek 

 word used to express some kind of bugbear, and suggested as the name 

 of these insects, probably, on account of the menacing aspect of some 



