36 PSELAPHIDA. 
and with a short plica between the deep sutural stria and the shoulder extending back- 
wards from the basal margin. The basal dorsal segment of the hind body is very deeply 
impressed on the middle, close behind the stria. 
The unique example is no doubt a male, as it has a transverse depression on the 
second, third, and fourth ventral rings; the fifth ring is extremely short in the middle. 
2. Apothinus obscurus. (Tab. I. fig. 19.) 
Castaneus, antennis pedibusque testaceis; antennis minus crassis, articulo nono fortiter transverso et preece- 
dentibus evidenter latiore; prothorace parce punctato. 
Long. 1 millim. 
Hab. Guatema.a, San Gerdénimo, Capetillo (Champion). 
Antenne with joints 3-8 small; the ninth joint extremely short, but evidently 
broader ; the tenth joint considerably broader and much longer than those preceding, 
the latter transverse; the eleventh joint large, obtusely acuminate. Head very small, 
the surface deeply depressed behind the front; eyes small. Thorax small, contracted 
behind; with an impression behind the middle, another in front of the middle, and 
another on each side, the lateral margin finely crenate. Elytra with a deep sutural 
stria, a short humeral fold, and a short fold between these. The male has the meta- 
sternum impressed, and a longitudinal impression at the extremity of the hind body. 
The punctures on the thorax of the female are very few and distant. 
One example from each locality. This species is very much smaller than A. impressi- 
frons, and has the antenne with a shorter club, which, moreover, is almost tri-articulate. 
EUPLECTUS. 
Euplectus, Leach, Zool. Miscell. iii. p. 80 (1817). 
This is a very widely distributed genus containing a large number of described species. 
1. Kuplectus guatemalenus. 
Subparallelus, depressus, dilute castaneus, elytris testaceo-castaneis ; capite quadrato, maxime impresso; pro- 
thorace elongato, basin versus fortiter angustato, profunde impresso. 
Long. vix 14 millim. 
Hab. GUATEMALA, Duefias (Champion). 
Antenne short, with the ninth and tenth joints transverse; the terminal joint short, 
obtusely pointed. Head broad; with a large, deep, quadrate depression on the front, 
the depression entire anteriorly, but divided behind by a prolongation from the vertex. 
Thorax elongate ; with a deep lateral impression on each side just behind the broadest 
part, and a large deep longitudinal impression on the middle, this latter being connected 
on either side with the lateral impression. Elytra with a deep impression within the 
shoulder, and a well-marked sutural stria. 
