TROGOCRYPTUS.—EPHISTEMUS. 603 
surface very polished and shining, pallid, with a black mark along the middle, the few 
punctures concentrated on each side of the middle. Elytra with very distinct series 
of punctures, the internal series becoming an impressed stria behind. Abdominal 
segments almost impunctate. Mesosternum strongly punctate, as are also the sides of 
the prosternum proper and of the metasternum. One specimen. 
Subfam. ATOM ARIINA. 
CNOSCELIS. 
Cenoscelis, Thomson, Skand. Col. v. p. 266 (1863). 
This genus is found in both the Palearctic and Nearctic regions, but includes only 
three or four species, and appears to be everywhere rare. 
1. Cznoscelis optata sp. n. 
Ferruginea, subtiliter pubescens ; prothorace haud transverso, crebre fortiter punctato, ante basin depresso ; 
antennis sat crassis, clava biarticulata. 
Long. 12 millim. 
Hab. Guatemaa, Cerro Zunil (Champion). 
Antenne with third joint small, not much more than half as long as the second ; 
ninth joint but little larger than the eighth. Thorax long, shining, coarsely and not 
densely punctured, with a broad impression at the base in the middle. Elytra finely 
punctate and pubescent. One specimen. 
Extremely similar to the European C. ferruginea, Sahlb., but readily distinguished 
from it by the coarser thoracic sculpture. 
EPHISTEMUS. 
Ephistemus, Stephens, Hl. Brit. Ent., Mandib. ii. p. 167 (1829); Ganglbauer, Kaif. Mitteleurop. 
iii. p. 737. 
This genus consists, as limited by Dr. Ganglbauer, of two European and one North- 
American species. One is known to me from within our limits. 
1. Ephistemus distans, sp. n. 
Ovalis, sat convexus, niger, nitidus; antennis pedibusque flavis, illis clava nigra. 
Long. 1 millim. 
Hab. GUATEMALA, near the city, Aceituno, Zapote (Champion). 
This minute insect is almost free from sculpture and very polished. The upper 
surface is unicolorous black, the head being reddish only about the mouth-parts. ‘he 
outline is quite continuous, the thorax and elytra are very accurately united, the base 
of the thorax sloping on each side to form an angle in front of the scutellum, and the 
shoulder of the elytra (seen from the side) appearing to slightly overlap the base of the 
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