AMERICAN HYMENOPTERA. 389 



DESCRIPTIONS OF FOUR NEW SPECIES OF 

 ODYNERFS FROM MEXICO. 



BY P. CAMERON. 



Odynerus (Stenancistrocerus) solan* sp. nov. 



Black; a broad curved mark on the sides of the clypeus above, a small trian- 

 gular (longer than wide at the apex) above the antenna-, a small spot on the 

 innerside of the eye incision in the centre, a short line on the outer orbits above, 

 a narrow line on upper edge of pronotum, united to a similar one on the upper 

 basal half of the propleurse, a large bell-shaped mark on the pleurae below the 

 tegulse, an irregular mark on the apex of the mesonotum, opposite the tegulre, 

 postscutellum, a broad line, narrowed below, on the sides of the apical slope of 

 the metanotum, a narrow line on the apex of the 1st abdominal segment, con- 

 tinued below half way to the base of the segment, and a similar but slightly nar- 

 rower line, all round, on the 2nd, yellow. Legs black, the apex of the femora, 

 the 4 anterior tibiae and the base of the hinder in front yellow. Wings fuscous- 

 violaceous, the nervures and stigma black. £>. Length to end of 2nd segment 

 9 mm. 



Clypeus pyriform, longer than its greatest width, its apex depressed, slightly, 

 broadly, roundly incised ; sparsely punctured, the apex more strongly and closely 

 than the rest. Mandibles with a triangular mark at the junction of the basal 

 two keels. Front and vertex rather strongly and closely punctured. Prothorax 

 and mesothorax with the scutellum rather closely and strongly punctured. Teg- 

 alse large, conchiform, piceous ; opposite them is an area thickly covered with 

 silvery pubescence. Postscutellum narrowed to a blunt angle. Sides of apical 

 slope of metanotum margined by a keel above; the apical slope excavated ; the 

 central keel is on the apical half only ; the sides are blunt, not distinctly angled. 

 First segment of abdomen longish bell shaped, bluntly rounded at the suture, 

 which is stronger laterally than in the centre; it is strongly and closely punc- 

 tured, much more strongly than the sides; its apex is smooth. The 2nd segment 

 is barrel shape, longer than it is wide at the apex, which is turned up slightly. 

 The second cubital cellule is narrowed in front. Scape of antenna* yellow, the 

 flagellurn reddish-brown below. 



The body is long and slender ; the thorax is transverse in front, 

 narrowed behind ; it is more than twice longer than wide. The 

 species agrees best with Stenancistrocerus. The 1st abdominal seg- 

 ment is longer than usual. 



Odynerus (Pacliodynerus) halmus sp. nov. 

 Black; covered with a velvety pile ; a broad band (the upper third) on the top 

 of the clypeus, a broad mark over the antennae, the lower part of the eye inci- 

 sion, a longish mark near the top of the outer orbits, a moderately broad line on 

 the top of the pronotum, a narrow one on the upper half of the base of the pro- 

 pleurse, tegulaa, a spot on the sides of the scutellum, postscutellum, a large spol 

 on the upper side of the apex of metanotum, a narrow line on the apex of the 

 1st abdominal segment, dilated at the sides and having there attached to it a 



TEANS. AM. ENT. SOC. XXXI. (49 s ) OCTOBKR, 1905. 



