270 DAVENPORT ACADEMY OV NATURAL SCIENCES. 



even in the male. The disk of the pronotum is flat with all the ca- 

 ringe distinct, the median being cut by the principal sulcus only in 

 front of the middle. The lateral carinae are very strongly sinuate in 

 front of the middle. The posterior margin of the metazone is strongly 

 angulate. The lateral lobes of the pronotum are higher than wide 

 with the anterior and posterior margins nearly straight and vertical. 

 A single or double series of somewhat irregular and broken carinse 

 extends more or less distinctly from the middle of the anterior border 

 to or toward the upper posterior angle. The carinse occupy the mid- 

 dle of a light stripe which is usually distinct and never entirely want- 

 ing. A usually more distinct but low broad carinae extends from 

 about the middle of the lateral lobes toward the lower posterior angle. 

 This is also outlined by generally lighter and strongly contrasting 

 color. The episternum of the mesosternum has a distinct high carina 

 which extends from the hind coxae toward the base of the tegmina. 

 The mesosternal lobes are separated by a space much broader than 

 long in both sexes and the metasternal lobes by a space as long as 

 (female) or longer than (male) broad. The tegmina and wings are 

 well developed, equaling or exceeding considerably the abdomen. The 

 former have the scapular field transparent, and filled by a single series 

 of oblique cross-veins. The discoidal area has a somewhat prominent 

 intercalary vein and the ulnar area a weak longitudinal vein. The 

 posterior femora have three distinct triangular brown spots on the 

 upper surface. The posterior tibiae are red or yellowish with the api- 

 cal spurs on the inner side more or less unequal in length. The ovi- 

 positor is barely or moderately exerted. 



Stirapleura, Scud., 1876. U. S. Geol. Surv. W. 100 Mer. , App. 



JJ, 510- 



In ^2.x\., Psolocssa, Scud., 1875. Cent. Orth., 25. 



This genus is North American and Western, none of the five spe- 

 cies known being found east of the Mississippi River. 



Key to stirapleura. Scud. 



A.' Posterior tibiae with the spurs on the inner side not very unequal. 



I . — Ornata, Scud. 



A. 2 Posterior tibiae with spurs on the inner side very unequal, the 



apical one being at least one and one-half times as long as the 



one behind it. 

 B.' General color brownish or yellowish, varied with darker brown 



and black spots and stripes. 



