TENEBROIDES, 423 
These examples are distinguished from the preceding species by their elongate 
parallel form, more quadrate thorax (which has short, broad, not acute front angles), 
and the middle of the head not deplanate, but feebly longitudinally impressed along 
the middle. 
16. Tenebroides oblongus, sp. n. 
Angustus, parallelus, minus depressus, subopacus, piceo-rufus; prothorace subquadrato, subtiliter marginato, 
angulis anterioribus latis, brevissime productis, angulis posterioribus obtusis ; elytris sat profunde punctato- 
striatis, interstitiis subtiliter biseriatim punctatis. 
Long. 6-7 millim. 
Hab. Mexico, Chinantla (Sallé), Cordova (Hége); Panama, Bugaba, Volcan de 
Chiriqui (Champion). 
Head rather finely punctured, dull, very feebly impressed along the middle towards 
the front. Thorax elongate, slightly narrowed but not sinuate behind; the lateral 
margin fine, placed rather low down; the front margin but feebly sinuate, so that the 
front angles are very broad and project but little; the surface rather more coarsely 
punctured than the head. Elytra elongate and narrow, with series of oblong punctures 
placed in slight strize, and with a very fine interstitial punctuation. 
Only one example has been procured in each locality. 
T. oblongus is allied to T. sulcifrons, but the more truncate form of the thorax in 
front separates it satisfactorily. 
17. Tenebroides mordax, sp. n. 
Elongatus, parallelus, minus depressus, piceus, antennis, pedibus elytrisque versus apicem rufis; elytris 
fortiter striatis, interstitiis latis, omnium subtilissime punctatis. 
Long. 8 millim. 
Hab. Costa Rica, Caché (Rogers). 
Head rather narrow, moderately coarsely punctured, very feebly depressed in the 
middle in front. Thorax subquadrate, the sides nearly straight, a little narrowed 
behind, the lateral margin rather fine, the basal margin interrupted for only a short 
distance in the middle, the front angles much produced, acute. LElytra with deep 
striz, which are punctate and continued to the apex ; the serial punctures on the inter- 
stices are excessively fine and are placed near to the striz, so that they are liable to 
be thought absent. Ventral segments coarsely punctate, shining. 
We have received only two specimens of this very distinct species ; one of them was 
labelled as having been found alive in a box of beetles. TZ. mordagr is perhaps more 
nearly allied to 7. sulcifrons than to any other species, though the two are very diffe- 
rent. It is probably variable, as the two examples before me differ a little in colour 
and sculpture. 
