AMERICAN HYMEXOPTERA. 215 



^ Ancistrocerus leensis sp. nov. 



Black; underside of aiitennal scape, clypeus, mandibles, except the lower 

 edge, a mark between the antenme, commencing at the clypeus, longish, roundly 

 dilated above, an irregular mark in the eye incision, a short line near the top 

 beliind the eyes, the base of the pronotum to near the middle, a small spot on the 

 mesonotum in the middle near the apex, postscutelluni, a large pyriform mark 

 below the tegulfe, the apex of the first abdominal segment, an oblique line run- 

 ning from its outerside towards the middle of the segment, the two reaching 

 close to the middle, an irregular spot on the sides of the second segment near the 

 base, the apex broadly almost all round and a narrow line in the centre of the 

 fourth, bright lemon-yellow. Coxa; and trochanters black, the femora fulvous, 

 the tibiae and tarsi yellow. Wings hyaline, the radial cellule smoky; the costa. 

 stigma and nervures black. %, . Length (total) 8 mm. 



Lower part of clypeus distinctly longer than wide; tlie apex with an incision 

 as long as it is wide ; the punctuation is strong, sparse. Front and vertex strongly 

 closely punctured ; the head, as is also the thorax, thickly covered with pale pu- 

 bescence. Base of thorax not quite transverse, the centre slightly curved 

 inwardly; the lateral angles blunt. Postscutellum rounded at base and apex. 

 Sides of metanotum broadly rounded, strongly punctured ; almost reticulated ; 

 the centre is not so rugosely, coarsely punctured as the sides. Metapleuite more 

 weakly and sparsely punctured than the rest. First abdominal segment much 

 more coarsely punctured than the second, the apex with a hand of larger punc- 

 tures, the basal slope more irregularly and weakly punctured, the extreme apex 

 slightly raised. The second segment is clearly longer than wide, closely, but not 

 strongly punctured ; its apex much more strongly punctured and more distinctly 

 reflesed than the first. Underside of flagellum and hook black. 



Lee County, Texas. 



This is a smaller and more slenderly built species than either 

 aiidfuiHS or fulvipes, with which it agrees in having two oblique 

 lines on the base of abdomen ; the sides of the metanotum are much 

 more broadly rounded, not at all angled and the femora only are 

 fulvous. I ^ 



Aiicistrocerus rivularis sp. nov. 



Black; clypeus, mandibles, a triangular small spot over the anteunse, a short, 

 narrow line on the top behind the eyes, antennal scape except on top, a broad 

 line, narrowed in the middle, on the base of the thorax, tegulse, a broad baud on 

 base of postscutellum, a band on the upper three-fourths of the metanotum on 

 the sides, broad above, narrowed below, the lower part produced on the inner- 

 side, a large mark, longer than wide, transverse above, rounded below, on the 

 pleurse below the tegulse, sulphur-yellow ; the abdomen sulphur-yellow, with the 

 following black markings: the basal slope of the first abdominal segment, from 

 the centre of this, runs to shortly beyond the n)iddle, a line, clearly longer than 

 wide, broadly rounded at the apex, from which runs a short narrow point, a 

 broad line on the base of the second segment; it becoming gradually narrowed 

 towards the apex, to which is attached a narrower and shorter transverse mark, 

 the sides of which become gradually narrowed to a point; broad bands, extend- 

 ing slightly beyond the middle, on the ba.se of the following three segments, a 



TRANS. AM. ENT. SOC. XXXIV. JULY, 1908. 



