342 FAMILY XL — LYGJEIVJE. 



the hind portion usually with an evident median carina ; scu- 

 tellum triangular, depressed and with a longitudinal median 

 carina, usually joined to a median or premedian transverse 

 elevation ; elytra covering abdomen and surpassing its tip, the 

 corium impunctate, its apical margin straight. Stal (1874, 104) 

 recognized 53 species, mostly from tropical America. Van 

 Duzee (1917) catalogued 27 from America north of Mexico. Of 

 these Barber (1921) in the latest revision of the genus, ac- 

 cepts 23, nine of which occur in the eastern states. 



KEY TO EASTERN SPECIES OF LYGiEUS. 



a. Pronotum black with a transverse red band across the middle of its 

 basal lobe; head with red spot or stripe on vertex; larger, 10 — 12 

 mm. (Subgenus Lygieus Stal). 

 b. Clavus without a pale inner margin ; ventral surface of abdomen 

 in great part red with black spots. 

 c. Membrane entirely black without pale margins or white spots; 

 head with a Y-shaped red spot, the prongs of the Y extending 

 downward between base of antennae and eye. 275. turcicus. 



cc. Membrane with pale margins, with or without white spots on 

 disk; clavus wholly black; red spot on head not Y-shaped. 



276. KALMII. 

 bh. Clavus with a pale inner margin; ventral surface wholly black. 



277. FORMOSUS. 



cut. Pronotum without a median transverse red band on basal lobe; 

 smaller, not over 10 mm. 

 d. Osteolar duct pale; head with red or pale markings (often very 

 small). (Subgenus Ochrostomus Stal). 

 e. Front lobe of pronotum wholly black or with black discal marks ; 

 head with only a small pale spot on vertex. 

 /. Membrane and corium margined with pale; pronotum with front 

 margin pale, the disk with a T-shaped fuscous stripe each side. 



278. LINEOLUS. 



ff. Membrane and corium without pale margins, the latter with only 

 the apical angles red; pronotum with front margin dark; disk 

 without T-shaped fuscous marks. 279. tripligatus. 



ee. Front lobe of pronotum red, its front margin yellow; head reddish- 

 yellow between eyes and tylus ; margins of corium and apical ca- 

 rina of scutellum pale; hind lobe of pronotum with two large sub- 

 quadrate dark spots. 280. mimulus. 

 dd. Osteolar duct black; head wholly black. 

 g. Upper surface not pubescent; membrane without a whitish discal 

 spot; length more than 7 mm. (Subgenus Melanocnryphus Stal). 

 h. Hind lobe of pronotum and entire corium, except hind margin, dull 

 red; front margin of pronotum, clavus and hind margin of 

 corium, pale yellow. 281. bicrucis. 

 hh. Hind lobe of pronotum black, the carina and side margins yellow 

 or reddish-yellow; costal margin of elytra and apical carina of 

 scutellum dull vellow. 282. facetus. 



