144 CYATHOCERID&. 
very remarkable, abrupt, extremely deep sinuation, in which the extremity of the 
retracted hind femur reposes. | 
The legs are slender and feeble, and very similar to one another ; the femora extend 
just to the sides of the body; the tibie are short and simple, terminated by a single 
feeble spur. The tarsi (Tab. IV. fig. 18°, tibia and tarsus) are of moderate length; 
they are not greatly shorter than the tibiee ; and each consists of a single rigid piece: 
although some appearance of division arises from the fact that the under margin is 
somewhat uneven in its outline, and that it bears a few rigid sete, yet careful micro- 
scopic investigation has failed to show traces of any real division. Neither do the 
prominences alluded to justify us in treating the tarsus as consisting of a number 
of consolidated joints; for if we were to judge from them, the tarsus would consist of 
at least seven joints. 
1. Cyathocerus horni. (Tab. IV. fig. 18.) 
Breviter suboblongus, convexus, opacus, niger, antennis testaceis, prothorace versus latera parum conspicue 
sordide fulvescente ; capite perpendiculari, oculis convexis in summo vertice sitis; prothorace transverso, 
valde ineequali, angulis anticis liberis, acutis ; elytris crenato-costatis. 
Long. ?, lat. vix 3 lin. 
Hab. Guatema.a, San Gerénimo and Guatemala city (Champion). 
Prothorax somewhat lobed in the middle, and emarginate on each side in adaptation 
to the convex eyes, which project above the thorax ; the very conspicuous anterior angles 
are markedly acute; and behind them the thorax is nearly regularly narrowed to the 
base, the sides not being curved; the surface is very uneven, the middle being much 
more raised than the lateral parts; along the middle is a broad depression ; and when 
looked at from behind, the middle appears also to be divided by two transverse 
depressions. ‘The elytra are each marked by three strongly raised elongate coste, and 
the suture also is raised; except for these coste there is no distinct sculpture. | On the 
under surface the ventral sutures are excessively deep, and the femora are more or less 
fulvescent. 
The individuals of this anomalous little creature are usually covered with an 
efflorescent substance having a saline appearance and quite obscuring the sculpture. 
I have been much assisted in my investigation of this curious little insect by my friend 
Dr. George H. Horn, of Philadelphia, and have great pleasure in associating his name 
with a creature of so remarkable a nature. 
