AMERICAN HYMENOPTERA. 387 



die; that on the 2nd is deeper and more clearly defined than that on the 3rd. 

 Palpi black. Areolet small, triangular; the nervures thick; the recurrent nerv- 

 ure is dilated backwards in front. Mesopleural furrow narrow, not very deep, 

 smooth. 



Hab. — Mexico. 



Comes nearest, of the known Central American species, to A. 

 tibialis Cam. 



Cenostomus trichiosoinus spi nov. 



Black; densely covered all over with white pubescence; the 2nd abdominal 

 segment testaceous, the base of the 4 front tibia? narrowly and the hinder tibiae 

 to shortly beyond the middle, pale yellow; the latter with a black mark near 

 the base. Wings hyaline, slightly suffused with fuscous towards the apex, the 

 costa and stigma black, the nervures testaceous. 9 • Length 8; terebra 1 mm. 



Antennas 37-jointed, densely covered with short black pubescence. Face 

 closely and strongly punctured ; the clypeus is more strongly, less closely punc- 

 tured, except narrowly in the centre and more broadly at the apex, where it is 

 smooth. Front and vertex closely punctured, except round the ocelli and a tri- 

 angular space below them, where they are smooth and shining. Prouotum and 

 mesonotum weakly punctured; their pleurae, except at the base, smooth and 

 shining. The scutellum roundly convex, weakly punctured. Median segment 

 closely, rugosely punctured ; it is more densely and longly covered with white 

 hair than the mesonotum ; there is a smooth keel down the apical half in the 

 centre. Pleural sutures stoutly crenulated. Abdomen smooth, the apical seg- 

 ments densely pilose; the suturiform articulations smooth, narrow, curved. 

 Areolet triangular, the uervures touching in front. Legs stout, the calcaria pale 

 at the base. 



Hab. — Mexico. 



The maxillary palpi, so far as I can make out without extraction, 

 appear to be 4-jointed, and this, with the triangular areolet and 

 that the parapsidal furrows do not extend much beyond the middle, 

 makes me refer the species to Cenostomus Foerster. Foerster says 

 of his genus "Das Gesicht ist hier zwar verliingert, aber aus dem 

 Munde ragt kein riisselformiger oder Konischer Zapfen hervor, wie . 

 manihu so hochst charakteristisch bei den Agathidoiden findet." 

 In my species there is a distinct malar space, in length about two- 

 thirds of the antennal scape; but the face is not so much length- 

 ened — rostriform — as in Agathis. 



cynipim:. 



Heptamerocera azteca sp. nov. 

 Black; smooth and shining, the antennas, teguhe and legs bright red ; wings 

 clear hyaline, the nervures pale testaceous. Abdominal bail- fringe rufous. 

 Apex of scutellum with a deep, longer than broad, cup; the keels bordering the 



TRANS. AM. ENT. SOC. XXXI. OCTOBER, 1905. 



