112 Annals of the Carnegie Museum. 



wide, the lateral margins very slightly convergent forward, frontal carinae 

 on either side rounded, little elevated and abbreviated, median carina 

 very low and thin, little more conspicuous anteriorly, the front border 

 advanced almost as far as the eyes, viewed in front concave; between 

 the eyes on either side of the median carina of the vertex little longitudi- 

 nally canaliculate; occiput declivous; frontal costa barely protuberant 

 between the antennae, thinly compressed above between the eyes, and 

 narrowly sulcate, the rami little thickened and barely widened forward 

 to the median ocellus. Eyes globose, little elevated above the dorsum of 

 the pronotum; ocelli moderately conspicuous, and placed between the 

 ventro-anterior fourth of the eyes; palpi slender, little depressed apically. 

 Pronotum anteriorly truncate, posteriorly straight subulate, passing the 

 femoral apices, dorsum distinctly flattened; median carina percurrent, 

 lightly compressed, thin, but distinct; humeral angles obtuse carinated, 

 distinctly compressed before the shoulders; humero-apical carinae distinct, 

 inclosing a moderately wide scapular area on each side; dorsum behind 

 the shoulders between the carinae subfossulate; the anterior carinae situ- 

 ated behind the anterior margin distinct and subparallel; the principal 

 median sulcus of the lateral lobes conspicuous; elytral sinus very small; 

 the inferior sinus large and angularly incised; posterior angles of the 

 lateral lobes outwardly flattened rectangulate, the lateral margins before 

 the acute a'pices barely convex, behind obliquely truncate, the middle 

 of the lobes indistinctly transversely carinated to apices. Tegmina elon- 

 gate, acuminate forward; wings perfectly explicate, as long as the pro- 

 notal process. Femoral carinae entire, little compressed; posterior femora 

 moderately robust, genicular denticles indistinct, the antegenicular den- 

 ticles very small; posterior tibial margins nearly straight, barely ampliate 

 near the apices, and sparingly acute dentate; the first and third articles 

 of the posterior tarsi equal in length, the first and second pulvilli small 

 and acute, the third pulvillus nearly as long as the first and second united; 

 and flat below." 



"Total length lo mm.; pronotum 9 mm.; posterior femora 4.7 mm." 

 "Habitat. — Demarara, British Guiana, South America. The type is in 

 Professor Bruner's collection." 



Otumba basalis sp. nov. 

 Most nearly related to 0. marcapata Hancock in its general size and 

 form but differing from it chiefly in being more closely and sharply granu- 

 lose on the pronotum and in the absence of the short longitudinal carinae 



