Hymenoptera from Central America. 269 



mark, triangularly pointed at the base and the apex, the 

 extrenae apex being bordered with black. The median seg- 

 ment has a broad black line, slightly and gradually narrowed 

 towards the apex, and at the sides is a shorter and narrower 

 black line inside the spiracles, which does not reach the apex. 

 The propleurte are coarsely punctured, except on the lower 

 part and close to the tegulje, the punctures on the lower part 

 running into reticulations ; the oblique furrow on the meso- 

 pleurse is deep, moderately wide, but becoming narrowed 

 towards the apex. Petiole shining, impunctate, depressed 

 and black in the centre at the base. The second to the fifth 

 segments broadly black at the base, the black on the second 

 segment dilated in the middle and extending along the sides 

 to the apex as a narrow line. The ventral segments are 

 narrowly edged with black at the apex. Legs yellow, the 

 femora lined with black above, the hinder coxae black on tlie 

 lower side, the middle trochanters blackish. The second 

 cubital cellule is shorter than the third, oblique, shortly petio- 

 lated above; the third cubital cellule becomes wider towards 

 the apex ; the first recurrent nervure is interstitial, the second 

 received shortly before the middle of the cellule. The base 

 of the fore wing to the transverse basal nervure and the apex 

 to the middle of the cubital cellules suffused wath fulvous. 



This species bears a great resemblance to a wasp (Polistes), 

 which fact is of interest in connexion with their supposed 

 habits. 



Trigonalys apia'penms, sp. n. 



Nigra, dense fulvo pilosa, abdominis apice late fulvo, tibiis tarsisque 



posticis testaceis ; alls fulvo-hjalinis, apice fumatis. $ . 

 Long. 8 millim. 



Hab. Mexico, Atoyac in Vera Cruz (//. H. Sm.ith). 



Antennse as long as the tJiorax, the middle thickened, the 

 apical part gradually and sharply narrowed ; almost bare, 

 the third and fourth joints testaceous ; black at the apex ; 

 the third joint distinctly longer than the fourth. Head closely 

 punctured on the front and vertex ; densely covered, the 

 mandibles (except the teeth) and clypeus included, with long 

 fulvous hair ; the clypeus shining, impunctate. Thorax 

 covered with fulvous hair, closely punctured ; the mesonotura 

 almost transverse at the base, depressed in the middle at the 

 base, and with a narrow indistinct furrow down the sides j 

 the scutellum rugosely punctured, thickly covered with long 

 lulvous hair, the sides at the apex with two narrow keels j 



