OLIARUS. 95 
specimens appears to be absent ; but under a compound microscope, with a good light, 
it is visible and distinct: this is the case with several allied species. 
§. Oliarus insignior, sp. n. (Tab. X. figg. 21, 214, 9; 22, 6, terminal 
segments of abdomen from beneath.) 
Major, fusco-pellucida, nitida, vertice latitudine paullo longiori, antice paullo angustiori, fusco-testaceo, ad 
medium nigro; fronte carina centrali et marginibus nigris; ocello frontali perconspicuo; scutello magno, 
distincte quinque-carinato ; tegminibus fusco-pellucidis, vittis ad apicem duabus plus minusve regularibus, 
interdum peene deficientibus, instructis, venis distinctis fuscis; abdomine supra nigrescenti; corpore 
subtus cum pedibus testaceis. 
Mas segmento ultimo ventrali leviter arcuatim emarginato, processu angusto, stylis robustis, longis, apicibus 
fortiter dilatatis, truncatis. 
A large species, with the head rather small; vertex alittle longer than broad, slightly produced and narrowed in 
front, fusco-testaceous, with a dark median line ; forehead with the central keel and the extreme margins 
black, the rest light testaceous; frontal ocellus very plain; scutellum with five very distinct carina, 
testaceous, with dark bands at the sides; tegmina shining, fusco-vitreous, with more or less irregular 
dark bands or markings before the apex and very distinct venation ; abdomen mostly dark; legs light 
testaceous. 
Male with the last ventral segment slightly, circularly emarginate, with a narrow and elongate process in th 
centre, and the styles very large and robust, the latter much widened and obliquely truncate at the apex. 
Long. cum tegm. 9-10 millim.; lat. ad hum. 3-33 millim. 
Hab. Guatemaua, Vera Paz, El Tumbador, Cerro Zunil (Champion); Panama, 
Volcan de Chiriqui (Champion). 
The specimen from El Tumbador is figured. 
9. Oliarus nigro-alutaceus, sp.n. (Tab. X. figg. 23, 23a, 9; 24, 3, terminal 
segments of abdomen from beneath.) 
Niger, nitidus, alutaceus, ocellis et oculis albidis, ocello frontali perdistincto ; vertice subexcavato, paullo ante 
oculos producto, apice truncato; scutello distincte quinque-carinato, leviter sculpturato, haud nitido ;. 
tegminibus pernitidis, asperate sculpturatis ; alis fumatis; pedibus fusco-testaceis. 
Mas segmento ultimo ventrali processu longo parallelo, stylis longis, apicibus subsecuriformibus. 
Black, shining, alutaceous, with the eyes whitish, all the ocelli distinct; vertex subexcavate, a little longer 
than broad; pronotum with the central keel and extreme margin light ; scutellum dull, with five distinct 
carinee ; tegmina very shining, quite opaque, unicolorous-black, strongly asperate; legs nigro- or fusco- 
testaceous. 
Male with the last ventral segment furnished with a long, parallel, central process, and with long styles, which 
are dilated and rounded at the apex and touch one another in the centre. 
Long. cum tegm. 44-5 millim.; lat. ad hum. 14 millim. 
Hab. Muxtco, Chilpancingo in Guerrero 4600 feet (2. H. Smith). 
This insect is entirely different in appearance from any other member of the genus. 
Oliarus known to me; but it agrees with the typical species in the shape of the vertex, 
which is angularly emarginate behind, the carination of the scutellum, and even in 
having the base of the central frontal carina forked—a character which is sometimes. 
replaced in others of the genus by a slight thickening. 
*132 
