337 



specimen occasionally occurred in the flocks of these creatures 

 which aflfected the marshy and damp margins of some of our streams; 

 but recently they have failed to appear, and only the G. oculatus remains 

 in smaller numbers. 



MoNONYX, Lap. 

 M. hadius. 



Mononyx hadius, H.-Schf., Wanz. Ins. ix, 27, fig. 894. 



Mononyx obscura, Stal, Ofv. Vetensk. Akad. Forhandl. 1854, 239, No. 3. 



Inhabits San Diego, California, Mexico, Panama, «S;c. 



It varies considerably in the depth and clearness of the brown color. 



Family NAUCOEIDJE. 



-ZV^. Poeyi. 



■S"AucoRis, Geoff. 



Naucoris Poeyi, Gner. {nee Amyot), Icones Eegne Auioial, 352, pi. 57, fig. 5; La 

 Sagra's Hist. lie de Cuba, 175. 



Inhabits Texas, Mexico, Cuba, Eio in Brazil, Illinois, Michigan, and 

 the Atlantic region from Cape Cod to Southern Florida. Amhrysus 

 Poeyi from Mexico is quite different from this. 



Ambrysus', Stal. 



1. A. Signoreti. 



Amhrysus Signoreti, Stal, Hemipt. Mes. Stettiner Eut. Zeit. xxiii, 460, Xo. 336. 

 Naucoris Poeyi, Amyot et Serv., Hemipt. 434, pi. 8, fig. 5 {nee Guerin). 



Inhabits California, Mexico, Arizona, and !N"ew Mexico. 



2. A. melanojyterus. 



Amhrysus melanopterus, Stal, Hemipt. Mex. 460, No. 337. 



Inhabits Mexico and Arizona. 



Family BELOSTOMID^E. 



Belostoma, auctor. 



1. B. americanum. 



Belostoma americanum, Leidy, Journ. Acad. Phila. new ser. i, 66. 



Inhabits Texas, and the Atlantic region from Massachusetts toFlorida. 



2. B. annulipes. 



Belostoma annulijjes, H.-Sclif., Wanz. Ids. viii, 25, figs. 803, S04. 



Inhabits Western United States, Mexico, Central America and North- 

 ern South America, Texas, and occurs more rarely iu the Atlantic region. 



Benacus, Stal. 

 B, griseiis. 



Belostoma grisea, Say, Heteropt. New Harmony, 37, No. 2.. 

 Belostoma haldemanum, Leidy, Journ. Acad. Phila. new ser. i, 65 (plate). 

 Benacus haldemanus, Stal, Ofv. Vetensk. Akad. Forhandl. 1861, 205. 

 Belostoma [mgustatum, Guer., La Sagra's Hist, de Cuba, 420. 



Inhabits Texas, Cuba, and the Eastern United States from Massa3hu- 

 setts to Florida inclusive. 



