202 p. CAMERON. 



b. First and second ubdominal segments not leflexed (the postscutelhini nifons; 

 the line on the apex of second abdominal segment dilated obliquely 

 backwards in the middle, the prothorax marked with rufous). 



heterospilus. 



The group of chelonogaster Cam. 

 This forms a well marked group from the form of the second 

 abdominal segment, which is longer than usual, and has the sides 

 and apex margined by a projecting brim ; characteristic, too, is the 

 raised apical margin of the basal two segments, the raised part 

 being narrowed in the centre. The apical segments are hid under 

 the large second and are minute. The median segment and the legs 

 are bright red. ^ 



-^ Odyiierus cheloiiogasfrus sp. nov. 



Black, densely pruinose, the pile giving it a whitish appearance; the ajiical 

 two-thirds of the clypeus broadly in the middle, mandibles, underside of antennal 

 scape, the greater part of the metanotum, the metapleuise except round the top 

 and apex and almost the basal two-thirds of the first abdominal segment red ; 

 the upper half of the sides of clypeus (the base above is black in the centre), a 

 large mark in the eye incision, a short line on the upper outer orbits, the apex 

 of the pronotum, a triangular mark on the sides of the apex of scutellum. 

 the apical half of postscutellum, the base and apex of tegulse (their centre 

 red), a pyriform mark on the i)leur8e below the tegulfe, a line on the apex 

 of first abdominal segment, its centre with two rounded dilatations, the part be- 

 tween being rounded and narrowed on the innerside; laterally the line is con- 

 tinued backwards to the red base; there is a broader line on the apex of the sec- 

 ond segment, with a rounded incision in the middle, the line laterally continued 

 near to the apex of the basal third, where it is broadened and is shortly pro- 

 longed towards the centre of the segment. Legs red, the tarsi black ; the tibiae 

 with a white line on the outerside. Wings hyaline, the nervures and stigma 

 black. Flagellum of antennse brownish-red below. 9 • Length to end of sec- 

 ond abdominal segment 8 mm. 



Head closely punctured, covered with silvery pile; the clypeus broader than 

 long, less closely punctured than the front; its apex has a rounded incision. 

 Base of thorax transverse, the sides not projecting. Postscutellum large, its 

 apex broadly rounded, as are also the sides of median segment. 



Oslar : Jerome, Arizona. 



This is a peculiar species as regards the form of the basal two 

 abdominal segments ; the white apex of the first abdominal seg- 

 ment is roundly raised— broadly, not curled up as with many spe- 

 cies — with a rounded depression between the dilated central part; 

 the apex of the second is ."similarly but not so distinctly raised and 

 with a transverse furrow at tlie apex of the incision ; beyond the 

 white border there is a thin raised margin, which is continued back- 

 wards along the lower edge of the segment to near its l)ase ; the 



