AMERICAN ENTOMOLOGY. 117 



dusky; peduncles of the eyes not longer than the distance between 

 their bases, a distinct seta on the superior part of the peduncle 

 near the tip, and another each side of the vertex above the an- 

 tennas, rather larger than the seta of the antennae : stemmata sit- 

 uated on a very slight elevation : trunk with the lateral spines 

 conic, blackish : scutel, spines cylindric, setigerous at tip : wings 

 hyaline, a band behind the middle, and a seniiband before the 

 middle, brown; poisers white : abdomen black, immaculate : feet 

 yellowish ; anterior thighs very thick rufous, blackish above and 

 beneath. 



Obs. This insect is very rare in Pennsylvania ; a few years 

 since, I obtained a single individual in the month of May: it had 

 alighted on a leaf of the skunk cabbage, near the Wissahickon 

 creek, a few miles from this city. During my subsequent excur- 

 sions in pursuit of insects, I had never the good fortune to meet 

 with another specimen, until the autumn of 1819, when with 

 Major Long's party on the Missouri, near the cantonment of the 

 party, on the river shore was a considerable body of rock, on 

 which I was frequently occupied in hunting for organic reliquiae ; 

 here, amongst other interesting objects, I had the satisfaction to 

 find the present insect in considerable numbers, lodged, for pro- 

 tection against the high winds and cool temperature, in small 

 crevices of the rock. 



The plate exhibits two views. The line shows the natural 

 length ; and a wing is figured below. 



CLYTUS. Plate LIII. 



Generic character. Body elongated, subcylindrie; head inclined; 

 antennae shorter than the body, inserted in an emargination of the 

 eyes, eleven-jointed ; labrum apparent; labial palpi with the last 

 joint obtrigonate ; thorax globose, unarmed; hind thighs clavate 



Obs. A genus somewhat numerous in species, belonging to the 

 natural family Cerambycidse Leach. The species were scattered 

 in the genera Cerambyx, Callidium, Lepfura, until Fabricius per- 

 ceived the necessity of a separation, and he embodied them under 

 the present designation. Many of them are very prettily orna- 

 mented with bright yellow bands and spots. In the larva state 

 they live in wood, penetrating freely through the hardest trees, 

 and proving very injurious to the particular kinds of timber which 

 they attack. 



