50 HYMENOPTEEA. 



end and immediately before the antennal fovea, which is not very deep and longer than 

 broad ; the lower ocellus is placed in a rather large depression. The clypeus is trun- 

 cated at the apex ; there is a large and moderately deep depression on each side above 

 it. The wings are longer than the body ; the apex is somewhat lighter than the base, 

 the first transverse cubital nervure is absent, but is indicated by a light band ; the third 

 is oblique, not curved ; the third (second) cubital cellule is not much longer than broad, 

 the apex at the top a very little wider than at the bottom ; in the second (first) cubital 

 cellule is a distinct horny point. The transverse median nervure is received a very 

 little beyond the middle. The stigma is fuscous on the lower half. The body is short 

 and thick ; the abdomen is not much longer than the head and thorax, and has the 

 apex truncated, with the saw but very little projecting; the feet are longish; the 

 femora reach near to the apex of the abdomen. 



What I take to be the male has the antennae nearly as long as the abdomen and half 

 of the thorax ; they are covered, but not very closely, with black hairs, which are very 

 nearly double the diameter of the antennae in length ; the antennee taper distinctly 

 towards the apex. The apical third of the anterior femora and the tibiae in front are 

 testaceous. The greater part of the abdomen beneath is dirty white ; the three basal 

 segments above are also dirty yellowish white. As usual with the male, the sutures on 

 vertex are not so deep. 



Sericocera piciventris, Kl., from Brazil, agrees with the male in coloration, except 

 that the legs are entirely black, and it is also a larger species ; but Klug only describes 

 the female of his species, which thus does not agree with S. truncata $ in coloration. 

 .8. nigrita, Klug, again, agrees with the female in coloration, but only the male is 



described by Klug. 



« 



12. Sericocera crassitarsis. 



Nigra, nitida, parva, antennis basi, tegulis, genibus, tibiis tarsisque albido-testaceis ; alis fere hyalinis, stigmate 



fuseo, cellula cubitali tertia apice producto. tf $ . 

 Long. 5 millim. 



Ha§t Panama, Volcan de Chiriqui 2500 to 4000 feet (Champion). 



The antennae are not longer than the thorax; the apical joint thin at the base, then 

 becoming thick and tapering but very slightly towards the apex ; covered with a very 

 sparse microscopic pile. The front is broad ; the vertex behind the ocelli has no 

 transverse furrow, nor is there a transverse furrow proceeding from the ocelli to the 

 eyes. The lateral furrows on the vertex are broad and deep, and reach to a little below 

 the base of the antennee. There is no defined frontal area ; but the lower ocellus is in 

 a basin, and the antennal fovea is large, oval, and deep. The front between the antennse 

 is broad and curves down gradually. The fovese above the clypeus are small; the 

 mandibles and apex of labrum are piceous, and the face is covered with scattered white 

 hair. The third cubital cellule is at the bottom nearly double the length of the first 



