NO. 2178. THE GENUS BRACON FABRlCWS— MORRISON. 309 



steeply, almost vertically downwards to the insertion of the antenna. 

 Between the antennal insertions are a pair of triangular or almost 

 piatelike projections, separated along the median line by a triangular 

 or rounded groove, and with their front edges in the same plane as 

 the face, rounded off at the apex, and extending backwards between 

 the antennae as a pair of small ridges which may reach the lower edge 

 of the median ocellus. This median ocellus is placed on the sloping 

 siu-face of the vertex, and approximately as far from the lateral 

 ocelli as they are from each other. The median ocellus is circular in 

 outline, while the two lateral ocelli have the inner front margins some- 

 what flattened. All of the ocelU are placed on slight elevations, and 

 the vertex is more or less swollen between the lateral ocelli, the 

 elevation in some cases approaching the appearance of an obsolete, 

 very short, longitudinal ridge. A more or less distinct marginal 

 ridge rims along the lower border of each antennal pit to where this 

 border turns upwards parallel to the eye margin, while from here on, 

 at least, the ridge is distinct and nearly always swells into a low arch 

 which is most prominent opposite some point on the median ocellus, 

 as the lower margin, the upper margin, or the middle. From the highest 

 point the ridge decreases in height gradually until it reaches the lat- 

 eral ocellus on its side, or in some cases until it becomes obsolete 

 some distance from the lateral ocellus. The head tapers rapidly 

 behind the eyes, and the occiput is strongly emarginated. 



In all nonnal specimens the whole of the vertex, the occiput, and 

 the head behind the eyes, and usually the cheeks are shining and 

 often appear polished, while the punctuation, and with it the hairi- 

 ness, varies from quite dense to wholly lacking over the various parts 

 mentioned. Usually there is a distinct fringe of hairs, most notice- 

 able in front and below, surrounding the compound eyes. The face 

 proper extends from the antennal fossae to the olypeal foveae, two 

 small deep pits located diagonally below and inside the lower corner 

 of each eye. Even cleared speounens show no transverse sutm-e 

 separating the face from the clypeus, and for purposes of description 

 I have taken the face as extending from the antennal pits to the tip 

 of the clypeus. The face is nearly always triangularly flattened 

 below the antennae, the flattened area starting near the outer lower 

 angle of each fossa, and coming to a point on the median lino of the 

 face not far below the interantennal plates. A more or loss cUstinct 

 gi'oove runs from between the interantennal plates to the lower end 

 of this flattened area. The largest and most closely placed punctures 

 found on the head are located on this flattened surface and on the 

 face on each side of it. Nearer the sides the punctures become smaller 

 until the malar space and at least the lower portion of the olypeus are 

 rather finely punctate. From each clypeal fovea a suture, superfici- 

 ally often whoUy obsolete, runs to the lower comer of the head on 



