167 



broad, flat, or slightly sulcate; sides parallel; lateral carinse distinct, slightly 

 divergent. Antenna; of the males half as long as the body. Pronotum quad- 

 rate; sides perpendicular, parallel; lateral carinse or humeral angles obtusely 

 rounded ; median carina distinct, except on the post-median lobe of the female; 

 third transverse incision very distinct and deeply indented, others distinct. 

 Posterior femora much enlarged near the base, the disk convex, about as 

 long as the abdomen ; posterior tibiffi enlarged toward the apex, hairy. Pro- 

 sternal spine cylindrical, bent slightly backwurd. Snb-anal plate of the male 

 triangular; apex blunt, entire; cerci with basal half broad, an obtuse tooth 

 about the middle of the posterior margin, above this bent and tapering. 



Color. — Male. Head and anterior lobes of the pi'onotum reddish or 

 olive-brown ; sides paler, with from one to three oblique, black lines ; trans- 

 verse incisions dark on the sides. Elytra unspotted, olive-brown, reddish at 

 the base, semi-transparent. Wings pellucid ; nerves »f the apical and front 

 portions dark, rest yellowish. Posterior femora j'ellow ; three black spots 

 on the upi^er edge ; interspaces of the disk black, ribs pale-yellow ; tibia? 

 yellow, spines black. Abdomen yellow, with small, black spots and stripes. 

 Venter and pectus yellow. 



Female. — Head and thorax olive ; legs and venter a brighter yellow than 

 the male. 



Colors after immersion in alcohol are only duller and darker. 



Dimensions. — 9 Length, 1.5 to 1.7 inches; elytra, 1.25 inches; posterior 

 femora, 0.92 inch; posterior tibiie, 0.81 inch. $ Length, 1.2 inches; elytra, 

 1 inch. 



Southern Illinois, Missouri, Nebraska (Thomas); Kansas, Iowa (Dodge). 



ReTnark. — There is a dark variety of this species found in Kansas and 

 Nebraska ; the general color is quite dark (almost black), tlie hind femora 

 are crossed by broad, black bands ; the lighter color is bright-yellow. 



CHROMACKIS, Walk. 



Body rather .slender, nearly cylindrical. Head smooth ; tip of the vertex 

 conical, depressed, with two converging keels, which are continued in the 

 abbreviated inner keels of the front; front (face) roughly punctured; outer 

 keels slightly diverging toward the corners of the lace. Eyes elliptical, 

 slightly prominent. Antennae filiform, long, slender. Pronotum sub-sellatc ; 



