600 STAPHYLINIDA. 
10. Sunius sanctus. 
Ferrugineus, antennis, palpis pedibusque pallide flavis, elytris ad latera nigro maculatis ; abdomine dense sub-- 
tiliter punctato, segmento penultimo nigro. 
Long. 44 millim, 
Hab. Guaremaua, San Gerénimo, El ji icaro (Champion). 
Antenne long and slender. Head oblong; pterygia distinct; eyes convex, placed 
almost nearer the vertex than the front. Thorax rather broad, as wide as the elytra, 
longer than broad, much narrowed behind, covered like the head with a fine reticulate 
sculpture. Elytra slender, longer than the thorax, a little narrower at the hind margin, 
more flavous in colour than the head or thorax, rather coarsely punctate, with a some- 
what angular dark mark on the middle of the side extending nearer to the apex than 
to the base. Hind body very slender, slightly narrower at the base, closely and rather 
finely punctate; the penultimate segment black. The male has a small excision at the 
extremity of the last ventral segment. 
One of the two examples found has an angular dark mark on the elytra as described 
above, while the other has a round mark. 
11. Sunius tenuis. (Tab. XV. fig. 19.) 
Angustior, ferrugineus, antennis, palpis pedibusque pallide flavis, elytris ad latera nigro maculatis, abdomine ante: 
apicem nigro cingulato. 
Long. 4 millim. 
Hab. Guatemata, Paso Antonio 400 feet (Champion). 
Very closely allied to S. sanctus, but a smaller insect, with much shorter antenne. 
Each wing-case has a very large black mark on the side. The male has a slight emar- 
gination on the hind margin of the last ventral segment. 
Ten examples were procured ; they show no variation except in the size of the black 
mark on the elytra, and not much in this. All have the head a little infuscate ; but 
this, I believe, is due to discoloration, the specimens being in very decayed condition. 
12. Sunius opaculus. 
Peropacus, ferrugineus, antennis, palpis pedibusque pallide flavis, elytris testaceis, prothoracis et elytrorum 
latera, abdominis segmentis duobus ultimis pectoreque nigricantibus. 
Long. 5 millim. 
Hab. Guatemaa, El Jicaro (Champion). 
Antenne elongate and very slender. Head broad, very slightly wider than the 
elytra, fusco-ferruginous. Thorax as broad as the elytra, longer than wide, only 
moderately narrowed behind, very dull. Elytra elongate, longer than the thorax, dull, 
roughly asperate-punctate, flavescent, with the inflexed margin blackish. Hind body 
densely punctate, quite dull, the two terminal segments dark. Unique. 
This insect has longer elytra than the immediate allies, besides being peculiar in its 
coloration. 
