MARGUS.—NAMACUS. 187 
1. Margus inconspicuus. 
Syromastes inconspicuus, H.-S. Wanz. Ins. vi. p. 14, f. 5707. 
Margus inconspicuus, Stal, Stett. ent. Zeit. xxiii. p. 303.1777; Hem. Fabr. i. p. 58.1; En. Hem, 
i. p. 184, 1°; Uhler, Hayden’s Surv. Mont. pt. iv. Zool. & Bot. p. 401‘; Bull. U.S. Geol. & 
Geog. Surv. ii. p. 292°; ib. iii. p. 405°; Town. Glover, Ill. Ins. Ord. Hem. p. 47, t. vi. f. 177- 
Hab. Norta America, Texas457, Colorado4 5&6, California4 5, Arizona & 7, — 
Mexico1?345 (Mus. Berol., Mus. Vind. Ces., coll. Dist.); Guatemaua, Duefias, 
Quezaltenango (Champion). 
Prof. Uhler® remarks upon the variation in depth of colour and markings in the 
Nearctic forms; the same character is very observable in Guatemalan specimens. 
2. Margus inornatus. (Tab. XIII. fig. 18.) 
Margus inornatus, Stal, Stett. ent. Zeit. xxxiii. p. 804. 179'; En. Hem. i. p. 185. 57. 
Hab. Mexico? ?. 
A typical specimen, in the collection of Dr. Signoret, is here figured. 
8. Margus obscurator. 
Coreus obscurator, Fabr. Syst. Rhynch. p. 200. 41. 
Margus impudens, Stal, Rio Jan. Hem. i. p. 37. 1°; Stett. ent. Zeit. xxiii. p. 308. 1787. 
Margus obscurator, Stal, Hem. Fabr. i. p. 57. 1, & p. 58.4; En. Hem. i. p. 185. 8°; Berg, Hem. 
Argent. p. 81. 100°. 
Hab. Mexico??, Chapultepek (Bilimek, Mus. Vind. Ces.).—Cotompia?; Brazi8, 
Rio Janeiro!?; ARGENTINE REPUBLIC 4. 
This species is easily separable from the two preceding by having the apices of the 
antenniferous tubercles spinous externally. 
NAMACUS. 
Namacus,A myot & Serville, Hist. des Hém. p. 242 (1843) ; Stal, Ofv. Vet.-Ak. Férh. 1867, p. 547. 
Dirnalus, Stal, Ofv. Vet.-Ak. Forh. 1859, p. 454. 
Namacus is at. once distinguished from the preceding genus Margus by the non- 
reticulated nervures of the membrane. The body is oblong and subelongate. 
Three species are enumerated—two from Guiana and one from Mexico. 
1. Namacus annulicornis. (Tab. XIV. fig. 8.) 
Namacus annulicornis, Stal, En. Hem. i. p. 186. 3°. 
Hab. Mexico}. 
A typical male specimen, in the Stockholm Museum, is here figured. 
BIOL. CENT.-AMER., Rhynch., June 1881. 78 
