BUPRESTIDAE. 201 



distinctly concave, and the prolohgation of the abdomen nuiches, 

 but does not extend along, the side pieces of the nietathorax; 

 there are no grooves on the under snrface of the prothorax, for 

 the reception of tlie antenna?; the tarsi are long or moderate; 

 the scutellum is transverse and acuminate in our genera, which 

 are but two in number: Agrilus is generally diffused; Eupris- 

 tocerus is represented by but one species, E. cogiluns, in the 

 Atlantic States. 



Hind tarsi with first joint scarcely elongated. Eupristocerus. 



Hind tarsi with first joint as long as tlie three following. Agrilus. 



Gronp II. — Braches. 



The body is rarely elongated, usually broad and ovate ; the 

 middle coxae are a little more distant than the anterior ones, and 

 the mesosternura is very widely divided; the prosternum is very 

 variable in form; the anterior margin of the hind coxae is but 

 slightly concave, and the prolongation of the abdomen extends a 

 short distance along the side pieces of the nietathorax ; the sides 

 of the prothorax beneath are deeply grooved near the margin, 

 for the reception of the antennae; the legs are very contractile, 

 the tibiae usually sulcate for the reception of the tarsi, which are 

 very short; the scutellum is triangular. 



Tarsi much shorter than tibise. 2. 



Tarsi rather long, body very elongate. Rhaeboscelis. 



2. Scutel small, tibiae linear. 3. 



Scutel large. 4. 



2. Body elongate ; prosternum pointed behind. Taphrocerus. 

 Body ovate ; prosternum obtuse behind. Brachys. 



3. Body triangular; prosternum very broad, almost truncate behind; 



tibijB dilated. Pachyscelus. 



Fam. XLIV.— lampyridae. 



Mentum quadrate, moderate in size, frequently formed of 

 two pieces separated hj a transverse suture; ligula not cor- 

 neous, prominent, without paraglossie; palpi 3-jointed. 



Maxillae exposed at the base, with two ciliate lobes, the 

 internal of which is sometimes obsolete; palpi 4-jointed. 



Antennne serrate, rarely pectinate or flabellate, usually 11- 

 jointed, inserted on tlic front, more or less distant, according 

 to the sub-family. 



Head sometimes prominent, sometimes protected by the 

 thorax; eyes rounded. 



