32 HYMENOPTERA ACULEATA. 



mandibles narrow and tridentate in the Si in the ? and 9 

 wide, with two stronger teeth, and numerous smaller ones. 

 Thorax in the <S with two very strong crenate lines con- 

 verging from the front of the mesonotum and uniting 

 near its centre, ? with the thorax widest across the 

 middle, ? thorax much widest in front, propodeum with 

 two spines in. the ? and ?, with two angles in the (?, 

 wings with one submarginal cell, in the S very pilose ; 

 basal node of the petiole nearly square, scarcely raised 

 posteriorly, third segment of the abdomen in the ? and 

 5 very long, nearly covering the following segment, sting 

 very small ; there is only one known species, which exists 

 in small communities, and makes its nests in the ground. 

 Forel says that the 5 at the least sign of danger folds 

 up its legs and antennae like those of the nymph, and 

 falls down, remaining motionless; the species is rare and 

 hardly anything is known of its habits. 



M. Latreillei, Cwt. — S shining, black, vertex of the 

 head much raised between the eyes, ocelli large, antennas 

 finely pilose with the first joint about as long as the second 

 and third together, remaining joints about sub-equal in 

 length, except the apical, which is about equal to the two 

 preceding together. Thorax above, very shining, clothed 

 with long hairs, converging lines of the mesonotum, and 

 transverse impression in front of the scutellum, strongly 

 crenate, propodeum with two short angular spines ; wings 

 very dark, and pilose fringed with fine hairs ; abdomen 

 smooth and shining, clothed with long hairs ; legs piceous. 



? and 5 pitchy brown, dull, head and thorax longitu- 

 dinally rugose, clothed with semi-erect hairs, mouth parts, 

 antennte, and legs reddish testaceous. Scape of antennas 

 curved, about as long as the flagellum without the apical 

 joint, wings in the ? very dusky, not so pilose as in the 

 S , propodeum with two strong spines, testaceous towards 

 their apices ; abdomen beyond the petiole shining, clothed 

 with long hairs, its apex more or less testaceous. 



