135 



C_ — Bueculae narrow anteriorly and more or less evenly diminishing 

 posteriorly, running out to a point; costal margin of eoriuni 

 straight at l)ase for about three-fourtlis length of scutel, then 



very gently and gradually outcurved aiigui<talus Uhl. 



CC. — Bueculae broad throughout their length, strongly so in front, 

 the posterior extremities very obtuse, sometimes here again 

 broadened, the tip in rare cases even slightly excurrent, though 

 never exceeding gulae; costal margin of corium straight at 

 base for nearly the length of scutel and then strongly out- 

 curved. 



D. — Sides of pronotum nearly straight; smaller paler forms 



seriecionis Schill. 

 DD. — Sides of pronotum strongly incurved; larger darker forms 



coloraden.sis n. sp. 



AA. — Costal margin of corium very gently rounded from the very 



base enmititus Dist. 



447 Nysius califorhicus Stal. 



Among all the American species this is the most widely distinct by 

 great size — for a iXysihs — and its short and broad bueculae. It ii 

 abundant on the West Coast, from Oregon to Nicaragua at least. The 

 largest and palest forms — the most typical — are found in California and 

 Nevada; from this region towards the north, east, and south, the forms 

 become somewhat smaller and darker, such being of frequent occurrence 

 in Washington, Utah, and Colorado. Nothing is known to me of the 

 extension towards Idaho and Montana. Through Mexico and the Cen- 

 tral American countries the forms become not only smaller and darker, 

 but have the membrane strongly fuscous spotted like Ortholomug. The 

 more typical examples of this latter kind Dr. Uhler has determined for 

 me as his providux, whidi name can thus only be retained as a variety. 

 The only far eastern extension of the species occurs through Arizona 

 and Texas to Alabama, through which range the individuals become 

 smaller but the membrane remains nearly clear. To this southeastern 

 form I give the name ahibamevsis, it being the dominant variety in 

 Alabama. The specimen recorded by Dr. Uhler from Maryland perh- 

 aps belongs here. Dr. Uhler also records the species from Cuba, but in 

 extended collecting there I have found but one large species and that 

 belongs ir OrlhoJomvs. 

 444 Nysius angustatus Uhl. 



This is the most abundant species in the Eastern United States, 

 extending northward into Canada, westward to Nevada, and south into 

 Mexico. I do not know that the larger more typical form passes the 

 southern Sierra Nevada. In Washington State is found a very dark 

 form which I have called variety virjer All over the West, even 

 throughout California, occurs a small pale form with the structural 



