146 ^ 



fulvous ill the middle. The depression at the sides of the scutellum 

 covered with longish fulvous pubescence. , , 



This species belongs to Saussure's group 3 b, Cf. Syn. of American 

 Wasps, 209, 



3947 Ancistrocerus gnnriisonensis sp. nov. 



Black; the head, thorax, and base of abdomen thickly covered with 

 long fuscous pubescence; the clypeus, a triangular mark above the 

 antennae, mandibles, a small mark on the outer orbits near the top, a 

 line on the apex of pronotum, a small irregular mark on the sides of 

 the scutellum, the outer edge of the tegulae broadly and broad lines 

 (the first only above) on the abdominal segments, bright lemon yellow. 

 Antennal scape yellow, the flagellum reddish brown below; the hook 

 reddish brown, short, not reaching to the base of the last joint. Wings 

 hyaline, the costa, stigma, and basal nervures fulvous, the apical 

 nervures blackisd. Legs black; the four anterior femora broadly tow- 

 ards the apex the posterior knees and all the tibiae and tarsi bright 

 lemon yellow. Male. Length to end of second segment 5 mm. Gun- 

 nison, Colorado, 



Clypeus longer than its greatest width, almost impunetate, the apex- 

 with a distinct rounded incision, the edges forming distinct triangular 

 teeth. Head above the antennae closely strongly punctured; the 

 punctures in the eye incisions stronger than elsewhere. Base of thorax 

 not quite transverse, the middle being slightly dilated; the sides are 

 distinctly bluntly angled. Apical half of scutellum with a wide distinct 

 furrow in the middle. Postscutellum coarsely (more coarsely than the 

 scutellum) rugosely punctured, depressed in the middle, the apex trans- 

 verse Sides of metanotum distinctly margined, projecting below the 

 middle into a sharp angle. Pro and mesothorax closely, rugosely punc- 

 tured, the upper part somewhat strongly, the lower part of the met- 

 apleurae finely and more closely longitudinally striated; the metanotum 

 acieulated and hollowed. Abdomen, except on the basal slope, closely 

 punctured, the apices of the first and second segments not reflexed; the 

 last segment is entirely black. 



Belongs to Saussure's Section C, Syn. of American Wasps, 167. It 

 is not unlike A. ormsbyensis Cami.; that species is larger and more 

 stoutly built; its wings have a distinct fulvous color; its clypeus is 

 longer compared with the width, with the apical incision deeper; the 

 furrow on the scutellum is longer and deeper; the sides of the metano- 

 tum at the base more distinctly and strongly reticulated. 



3949 Ancistrocerus lineativentris sp. nov. 



Black; the clypeus, labrum, mandibles except narrowly at the base 

 and on the innerside, antennal scape except above, a small mark over 

 the antennae, a short narrow line on the top of the outer orbits, the 

 upper edge of the pronotum including the lateral projecting edges. 



