SUBFAMILY I. — LYG^EIN^. 351 



ing link between the two, as in it the costal margin of corium, 

 except at extreme base, is almost as straight as in 0. scolopax. 

 The head, however, is shorter and apex of osteolar duct not 

 auriculate. Seven species of Nysius are recognized by Van 

 Duzee from North America, six of which are known from our 

 territory. 



KEY TO EASTERN SPECIES OF NYSIUS. 



a. Bucculae abbreviated, distinctly narrowed and evanescent behind, 

 scarcely reaching back of middle of eyes, the first joint of beak 

 extending much beyond them ; costal margins of corium straight 

 at base for a distance less than half the length of scutellum, then 

 suddenly narrowly expanded and straight and parallel to apex. 

 b. First joint of antennae distinctly surpassing tip of tylus; pronotum 

 without a raised calloused space each side of middle. 



286. CALIFORNICUS. 



bb. First antennal scarcely reaching tip of tylus; pronotum with a 

 short elevated calloused line each side of middle. 287. BASALIS. 

 aa. Bucculae almost or quite reaching base of head, low but distinct 

 throughout, first joint of beak not or but slightly extending behind 

 them ; costal margins of corium straight along the basal fourth or 

 third, thence gradually expanded and visibly curved to apex. 

 c. Basal joint of beak not extending behind the bucculas; disks of 

 corium and clavus but little infuscate. 

 d. Basal joint of antenna? distinctly surpassing tip of tylus; eyes 

 very prominent, width of head across them equal to that of 

 hind margin of pronotum ; color pale gray, pronotum with only 

 the transverse impression of front lobe fuscous. 288. thymi. 

 dd. Basal joint of antennae scarcely passing tip of tylus ; eyes less 

 prominent, width across them less than that of hind margin of 

 pronotum. 

 e. Color above dark gray, the pronotum and scutellum with numer- 

 ous fuscous blotches; nervures and hind margin of corium 

 in part fuscous ; form rather robust. 289. eric^e. 



ee. Color above pale dull yellow with two vague fuscous stripes on 

 head and four on pronotum; corium without spots, except a 

 minute one at extreme tip ; form slender, subparallel. 



290. STRIGOSUS. 

 cc. Basal joint of beak extending slightly behind the bucculae; disks 

 of corium and clavus clouded with fuscous. 



291. GRCENLANDICA. 



286. (466). Nysius californicus Stal, 1859a, 242. 



Elongate-oblong. Grayish-yellow, clothed with a minute glistening 

 silvery-gray pubescence; head with a large fuscous spot surrounding each 

 ocellus ; pronotum often in great part fuscous, sometimes with only a 

 narrow curved very irregular line across transverse impression and hind 

 angles with a small spot, blackish; scutellum with base and punctures on 



