PLECTODERES. 111 
the pronotum, and about the same length; scutellum tricarinate; front parts testaceous ; tegmina brown 
or fuscous, narrowly testaceous at the base, and with a small reddish spot on each side at the margins 
before the apex, the transverse claval vein very conspicuous; wings dark, opaque; legs testaceous or 
pitchy-testaceous. 
Long. cum tegm. 5 millim.; lat. ad hum. 2 millim. 
Hab. Panama, David (Champion). 
8. Plectoderes lineatocollis, sp. n. (Tab. XI. figg. 26, 26, a, 6, 3.) 
Parvus, parallelus, brunneus; vertice brevi, ante oculos vix producto, carina centrali et marginibus testaceis ; 
fronte clypeoque ad medium et latera carinatis, fuscis vel nigrescentibus, vittis transversis latis testaceis ; 
pronoto scutelloque carinis tribus perdistinctis testaceis ; tegminibus venis planis, testaceis, pone clavum 
ampliatis ; abdomine piceo; pedibus testaceis. 
Mas segmento ultimo processu brevi obtuso; stylis brevibus, crassis. 
A small dark brown species, with the vertex short, scarcely produced before the eyes, the strong central keel 
and the margins light testaceous; frons and clypeus with a strong central keel and also keeled at the 
sides, banded transversely with dark and light colour; pronotum very short, dark, with light hind 
margin, and, like the scutellum, with three very distinct light testaceous keels; tegmina fuscous-brown, 
with distinct lighter veins, dilated behind the clavus and strongly overlapping when at rest; wings 
smoky ; abdomen pitchy-black ; legs testaceous. 
Male with the last segment of the abdomen furnished with a carinate blunt process, which is truncate at the 
apex ; the styles short, thick, dilated at the tip. 
Long. cum tegm. 6 millim.; lat. ad hum. 13 millim. 
Had. Mexico, Amula in Guerrero (H. H. Smith); Panama, Volcan de Chiriqui 
(Champion). 
Superficially, this species much resembles Helicoptera sobrina, with which it was 
mixed in our collection. 
A specimen from Amula is figured. 
9. Plectoderes fuscolineatus, sp. n. (Tab. XI. figg. 27, 27 a.) 
Angustus, delicatus, sat nitidus; vertice lato, brevi, ante oculos paullo producto, leviter ad medium carinato, 
testaceo; fronte clypeoque ad medium et ad latera distincte carinatis, subparallelis, testaceis ; pronoto 
brevissimo, testaceo; scutello magno, convexo, carinis tribus plus minusve fusco utrinque notatis ; 
tegminibus basim versus angustis, pone clavum dilatatis, venis quibusdam fusco-notatis ; abdomine piceo ; 
pedibus testaceis. 
Narrow, rather shining, with the vertex short and broad, slightly produced before the eyes, truncate in front ; 
eyes large, not emarginate, but somewhat produced underneath; frons and clypeus distinctly keeled and 
margined, subparallel ; pronotum very narrow, with a central keel (distinct under a high magnifying- 
power); front parts testaceous ; scutellum testaceous, with three keels, somewhat widely separate, which 
are more or less marked with fuscous on each side; tegmina long, narrow, and parallel towards the base, 
dilated behind the clavus, semitransparent, with the veins more or less broadly darkened with fuscous 
colour until near the apex, and so appearing broadly lined longitudinally ; wings smoky, with distinct 
veins ; abdomen pitchy-testaceous ; legs light testaceous. 
Long. cum tegm. 6 millim.; lat. ad hum. 13-13 millim. 
Hab. Mexico, Teapa in Tabasco (H. H. Smith). 
One of our specimens appears to be a male, but the abdomen is too much shrivelled 
and contracted to determine the characters properly. 
al 
