AMERICAN HEMIPTERA. 53 



Humeri obtuse or acute, not spinose; edge of the abdomen sometimes pale but 

 without distinct black points . . .eiDKf ator and pailidiTeiiti'is. 



3. Head short, narrowed before the eyes to the rounded apex, the sides not at all 



parallel ; sui'face closely and evenly punctured brevis.- 



Head longer, sides distinctly parallel before the antennse, apex broad, 

 rou nded 4. 



4. Color dark green ; tip of the scutellum and a band connecting the humeri, 



scolloped posteriorly, pale or in part sanguineous. . . aiil jgii(>ii!>ii!>«. 

 Color green or greenish white, without pronotal band 5. 



5. Connexivuin distinctly maculated ; venter with a row of black jioints on the 



hind edge of each segment piiiictiventris. i 



Connexivum immaculate or with nearly obsolete spots; black points on the 

 veuter wanting rugiilosa. 



Tliyanta perditor Fabr. 



This species seems to be more typical of the West Indies and 

 Mexico. According to Dr. Uliier it is found in the eastern United 

 States as far north as Savannah, and in the west fi'om Nebraska to 

 Colorado and Arizona. Pi-of. Osborn records it from South Dakota 

 and Prof. Cockerell has taken it in New Mexico. This species 

 varies in about the same manner as CMsfotor, but in all the specimens 

 I have seen the humeri are produced in acute spines, the edge of 

 the abdomen is fulvous with conspicuous black points, and the stig- 

 mata are black. In my collection the specimens from Mexico and 

 the West Indies have the pronotal band more pronounced. 



Tliyanla cii!>«tator Fabr. 



A variable and widely distributed North American species which 

 becomes more abundant toward the south and west. I have seen 

 specimens from New York to Vancouver Island and south to 

 Arizona but in the east at least it is rare to the north of New York 

 City. The sanguineous band on the pronotum is generally wanting 

 in specimens from the north and east. Sometimes there are black 

 points on the stigmata and at the incisures on the edge of the abdo- 

 men, but generally these are wanting, and the connexivum is con- 

 colorous. On the hot arid prairies of the west the color becomes 

 whitish green, and when immature it is often of a testaceous color. 



Thyanta pallido-vireiis Stal. 



I have seen two or three specimens fi'om Utah and California 

 that agree in all particulars with Stal's description of this species, 

 but I can find no characters that will satisfactorily distinguish 



TEANS. AM. ENT. SOC. XXX. FEBBUAKY, 1904. 



