THERANEIS, 225 
THERANEIS. 
Theraneis, Spin. Ess. Hém. p. 179 (1837) ; Stal, En. Hem. i. p. 90 (1870). 
This genus differs from Mibrenus in having the anterior coxze unarmed; and from 
Largus it is distinguished by the elongated body and the non-dilated lateral margins of 
the corium. ‘The head is transversely excavated between the eyes. 
Three species have been recorded, all Neotropical, and occurring south of our fauna ; 
to these may be added the two from Central America here described. 
1. Theraneis pulchra, n. sp. (Tab. XXII. fig. 1.) 
Black ; antenne with the second, third, and fourth joints ochraceous, the second with the extreme base and 
the fourth with the extreme apex fuscous. Corium and lateral posterior angles of the pronotum reddish 
ochraceous. Apical angle of corium and margins of membrane greyish white. Anterior portion of head 
above, anterior and posterior margins of frontal lobe of pronotum, and a central longitudinal line to posterior 
pronotal lobe pale greyish pubescent. Body beneath sparingly covered with greyish pilosity. Tibiz palely 
setose, tarsi pale brownish. 
Antennz with the first and fourth and the second and third joints subequal in length; posterior lobe of 
pronotum thickly and coarsely punctate, scutellum more faintly so; anterior femora armed beneath with 
two spines near apex, one considerably larger than the other. 
Long. 8-94 millim. 
Hab. Panama, Volcan de Chiriqui 2000 to 3000 feet, Bugaba (Champion). 
This species is allied to 7. constricta, Stal, which was recorded from Colombia, and 
from which it differs by the different colour of the antenne, and the unicolorous clavus 
and corium, black and opaque membrane, &c. 
2. Theraneis dissimilis, n.sp. (Tab. XXI. fig. 24.) 
Head black, thickly covered with greyish pilosity ; antenne black, first and fourth joints longest and subequal 
in length, second longer than third, which is shortest. Pronotum pale ochraceous, anterior lobe (excluding 
lateral and anterior margins) and two large subquadrate spots at base of posterior lobe pale brownish ; the 
anterior lobe is defined posteriorly by a transverse row of very deep, coarse, dark punctures ; and there are 
a few scattered but paler dark punctures between the basal subquadrate spots. Scutellum fuscous, with 
the apex more or less ochraceous. Corium pale ochraceous, a large subtriangular spot on centre of disk, 
and clavus (excluding margins) ferruginous. Membrane ferruginous. Head and body beneath, rostrum, 
and legs fuscous or ferruginous ; anterior, posterior, and lateral margins of prosternum, posterior margins 
~ of meso- and metasternum, coxe, lateral margins and a central longitudinal fascia to abdomen (the last 
not reaching beyond fourth abdominal segment) ochraceous; tarsi beneath dull ochraceous, 
Long. 9-10 millim. 
Hab. Costa Rica, Cache (Rogers); Panama, Bugaba (Champion). 
Var, a. Above with the ferruginous markings paler, but larger, and becoming more or less suffused with the 
ochraceous ground-colour, which is also darker. 
Var. b. Above with the ferruginous markings larger, and on corium occupying the whole of disk, with the 
exception of the lateral and apical margins ; clavus, with the exception of apical margins, totally ferruginous ; 
membrane somewhat abbreviated, exposing apex of upper surface of abdomen, which is ochraceous. 
Three specimens only of this species have been received, two from Costa Rica and 
one from Panama; and as they all vary, it is probable that 7. dissimilis must be of a 
BIOL. CENTR.-AMER., Rhynch., January 1883. 29 
