196 HEMIPTERA-HETEROPTERA. 
There is great variation in the length of the specimens which I have examined, the 
smallest of which are 64 millim. long, and the largest measure 9 millim. 
2. Ischnodemus precultus, n. sp. (Tab. XIX. fig. 7.) 
Head, pronotum, and scutellum black ; posterior margin and lateral angles of pronotum ochraceous. Clavus, 
corium, and membrane pale ochraceous; margins of clavus and corium somewhat darker; a subclaval 
streak to corium and veins of membrane pale fuscous. Antenne pale ochraceous ; apical joint, excepting 
base, fuscous. Body beneath black; head and sternum dull and opaque, abdomen shining and somewhat 
castaneous. Rostrum and legs ochraceous, the first just passing the anterior coxe#, but not reaching the 
mesosternum. Abdomen above black, the margins ochraceous. 
Long. 4-5 millim. 
Hab. Guatemata, Paso Antonio (Champion). 
This species is very closely allied to L. falicus, Say, from which it differs by the 
colour of the rostrum and antenne. The basal ochraceous portion of the pronotum is 
also smaller than in Say’s species, judging from that author’s description and Dr. 
Signoret’s figure of the species. As Prof. Uhler has not (so far as I am cognizant) 
alluded to any variation in J. falicus, I have been compelled to describe this insect as 
@ new species. . 
BLISSUS. 
Blissus, Burm. Handb. 2. 1, p. 290 (1835) ; Stal, Ofv. Vet.-Ak. Férh. 29: 7, p. 45 (1872). 
Blissus (part.), Stal, Hem. Afr. ii. p. 122 (1864). 
The apical margin of the corium in Blissus is obtusely angulated and sinuated near 
the apex of the clavus, a character which alone will differentiate it from the preceding 
genus. Blissus has a wide habitat, being recorded from South Africa, Abyssinia, and 
the Oriental and Palearctic Regions. 
1. Blissus leucopterus. _ 
Lygeus leucopterus, Say, New Harm. Ind. Dec. 1831; Compl. Writ. 1. p. 329. 5. 
Micropus leucopterus, Sign. Ann. Soc. Ent. Fr. (3) v. p. 31.11, pl. 2. f. 11; Town. Glover, Ill. Ins. 
Ord. Hem. p. 48; Riley, Seventh Ann. Rep. Ins. Missouri, 1875, p. 19, figs. 2, 3, & 4. 
Blissus leucopterus, Stal, En. Hem. iv. p. 133. 3’; Uhler, Bull. U.S. Geol. & Geog. Surv. ii. p. 306°. 
Rhyparochromus leucopterus, Packard, Guide Study Ins. 5th edit. p. 543, fig. 547. 
Hab. Norta America, Wisconsin!?, Michigan?, New Jersey ?, Illinois!, Texas ?, 
California 2,—Mexico (Bilimek, Mus. Vind. Ces.); GuatemMaua, San Gerénimo, Paso 
Antonio, Panzos, Champerico, Rio Naranjo (Champion); Panama, Volcan de Chiriqui, 
2000-3000 feet (Champion).—Cvsa 1. : 
This is the well-known ‘‘Chinch Bug,” one of the most noxious and injurious insects 
to the agriculturists of North America. According to Riley the injury is caused by 
the insect sucking, by the aid of its rostrum, the grasses and cereals, “ thereby causing 
them to shrink, wilt, and wither—and not by biting their substance, as many persons 
suppose.” ‘The multiplication of the insect in North America appears to have been 
