1910] North American Paniscini 187 



the eye which is eUiptical in form extends toward the middle of 

 the head, somewhat, thus making the distance between these 

 organs at the vertex, a little less than at any other point. 



The cheek, which lies behind the eye, is nearly uniform in 

 width from the top to the base, and is only slightly narrower 

 below where it extends slightly beneath the eye. The face in 

 general is clothed with a short thick mat of sericeous pubescence. 



CLYPEUS. 



The clypeus, which is more or less irregular in outline, being 

 rounded above (convex) and nearly straight along its free margin 

 occupies about a third of the distance from the antennas to the 

 mandibles. On either side there is a projection, which extends 

 just below the compound eyes, and about half way between the 

 extremities of these projections and the dorsal edge of the cly- 

 peus are situated a pair of oval depressions, one on either side 

 known as clypeal foveae. The dorsal edge of the clypeus ' is 

 marked by a transverse suture (or rather what was once appar- 

 ently a suture, as there are no distinct sutures separating the 

 clypeus from the frons) some little distance below the insertion 

 of the antennas. Between these there is quite a noticeable 

 depression, the lower side of which is most pronounced. 



FRONS. 



The frons may be regarded as extending upward from the 

 clypeus to the ocelli, with a downward extension on each side 

 of the clypeus, where it appears to meet the cheek just below 

 the eye. About two-thirds of the whole distance from the 

 dorsal line of the clypeus to the ocelli, is the place of insertion 

 of the antennse. That portion of the frons, from the antennae 

 extending downward, projects in front of the level of the eye, 

 while the portion above the antennas is slightly sunken behind 

 this level. 



OCELLI. 



The ocelli, which are of nearly equal size, are three in num- 

 ber, and are arranged to mark the corners of an equilateral 

 triangle. The two lateral (posterior) ocelli nearly touch the 

 compound eyes. An imaginary line passing through the pos- 

 terior ocelli marks the vertex as treated in this paper. No 

 sutures separating the vertex from the posterior portion of the 

 head, above, of from the cheeks, behind the eyes, are present, 

 and the limits of these parts are therefore somewhat indefinite. 



