AMERICAN HYMENOPTERA. 265 



Head and thorax sparsely covered with longish blackish hair and more 

 sparsely with longish silvery pubescence; the clypeus more densely than the 

 rest. Its apex is testaceous and is broadly rounded. Basal two-thirds of mandi- 

 bles testaceous, the apical black. The basal half of the pronotum is depressed, 

 the apical being clearly raised above it; it is bordered all round with testaceous. 

 Tubercles large, flat, testaceous, the sides and apex bordered with silvery pubes- 

 cence. Mesopleurpe roundly bulging out; a large, round fovea in the centre. 

 Post-scutellum bordered by keels, the part on either side densely covered with 

 silvery pubescence. Apical slope of nietanotum closely, transversely striated ; 

 there is a large curved fovea on the upper part of the metapleurse. The meso- 

 pleural furrow bears in the middle some stout stria:'. Abdominal petiole as long 

 as the 2nd and the half of. the 3i'd segment. 



Hab. — Mexico. 



Crabro mexicaniis sp. nov. 



Black; the mandibles broadly at the base, the greater part of the antennal 

 scape, the lateral third of the apex of the ))ronotum, the scutellar keels, a curved 

 line on either side of the apex of post-scutelUim, a line on the propleurje, united 

 to the line on the pronotum, joined to the yellow tubercles and continued down 

 the apex of the propleurse, yellow; the fore femora (except a black band behind) 

 tibife and tarsi, a line on the underside of the middle femora at the apex, the 4 

 hind knees, the basal half of the posterior tibiae behind and the greater part of 

 the hind tarsi, yellow. Flagellum of anteuijai brownish beneath. Wings hya- 

 line, the uervures black. % . Length 5 mm. 



Face and clypeus densely covered with silvery pubescence; the middle of 

 clypeus bearing 4 short, obtuse teeth, the outer sharper and narrower than the 

 inner. Vertex and front above shagreened ; the frontal depression bordered 

 above by a keel ; a distinct, deep furrow runs to it from the ocelli. The upper 

 part of the eyes is bordered by a furrow, which is obscurely crenulated on the 

 outer side. Occiput acutely margined. Mesonotum closely, minutely punctured ; 

 its centre at the base is depressed and there is a shallow furrow on either side of 

 the depression ; on the outer side of these, at the extreme base, is a row of 4 or 

 5 foveas. Hinder edge of scuteilum obscurely striated ; a stout keel in the centre 

 of the basal depression. Metanotal area bounded by a keel, which is bordered 

 by a furrow on the inner side ; in the centre are 2 keels, which converge slightly 

 towards the apex ; on either side of these, at the base, is a curved keel, forming 

 a semi-circular area; the apical slope has the central depression obscurely trans- 

 versely striated. Mesopleurje densely covered with silvery pubescence ; on the 

 top, at the base, are 4 stout keels; the furrow bordering these bears some stout 

 keels and reaches close to the sternum ; the apical furrow is crenulated. Meta- 

 pleurse with a line of foveas near the base and another bordering the apex. First 

 abdominal segment broad at the base, becoming gradually wider towards the 

 apex; it is longer than the 2nd segment Hind tibiae with 4 obtuse teeth, the 

 central pair the larger. Apical abcissa of radius straight, not oblique; recurrent 

 nervure received in the middle of the cellule. 



Hab. — Mexico. 



Comes near to C. yacataaensis and C. montezmna. The ocelli are 

 in a curve; the occiput roundly incised. 



TRANS. AM. ENT. 80C. XXX. (34) SEPTEMBER. 1904. 



