204 p. CAMERON. 



This species has the general coloration of A. tuberculiceps, the 

 chief difference being that there is a spot, not two lines, on the meso- 

 uotum, only one mark on the niesopleurie, and that the frontal lines 

 unite behind the ocelli ; the body is densely haired, the hair being 

 black, not gray ; structurally it differs in having the top of the 

 metanotuni margined by rounded keels, the sides being bordered by 

 weaker keels; it is a larger species and the centre of the second 

 abdominal segment is roundly, broadly tuberculate ; the suture on 

 the base of the abdomen is weak. 9 • 



Boulder, Colorado. 



Belongs to Saussure's Section 1, Syn. of Am. AVasps, p. 159. 



0«lyiieriis tuberculiceps Sauss. 

 What agrees fairly well with the above Mexican species has been 

 taken at Oslar, Las Vegas, New Mexico. The only difference 

 which I can make out, without a type, is that the red line round 

 the inner orbits is interrupted by a black oblique one which runs 

 from the black on the vertex to the inner top of the eyes (judging 

 by Saussure's figure on PI. XVI, f. 9, 10a), but according to the 

 description in Syn. of Am. Wasps, 185, the line is interrupted "at 

 the summit." The frontal red line on the Las Vegas specimen 

 commences at the top of the eye incision, is broad, has two incisions 

 on the inuerside, is narrowed and roundly curved at the top towards 

 the tubercle. There are three red spots on the mesopleurse, a large 

 wide irregularly oval basal one, followed by a much narrower, more 

 oblique one, sharply pointed above, broader and more rounded 

 below, these two running from above downwards ; below them is a 

 line of about the same size as the apical one, but running from the 

 base to the apex of the pleurae. In having the body densely covered 

 with gray pubescence, in having a shining tubercle above the ocelli, 

 in the front ocelli being the larger, in the apex of the clypeus being 

 shortly bluntly bidentate, and in the general coloration it agrees 

 with the figure and descriptions of tuberculiceps. 



The group of Ancistrocerus lineativentris Cam. 



Black, the lighter markings bright sulphur-yellow ; the basal two 

 abdominal segments with large black marks at the base, the marks 

 roundly broadly, or narrowly and deeply incised laterally. The 

 body densely haired ; the sides of pronotum projecting or not. 



To this group might be referred auranus Cam. if it were not that 



