DESCRIPTION OF THE SPECIES. 261 



down, so that the distance between them is remarkably large. 

 Otherwise the head is beset with almost bristle-like white stubble- 

 shaped pile. The very large and sharply defined frontal lunule, 

 the face, including the cheeks, and the lower half of the occiput 

 are whitish ; the upper part of the latter blackish, although 

 covered with whitish pollen. The perpendicular diameter of the 

 eyes has about double the length of the horizontal one ; neverthe- 

 less, the cheeks are remarkably broad ; a brownish stripe runs 

 from the lower corner of the eye perpendicularly towards the 

 edge of the mouth ; the hairs, inserted upon its lower end, are 

 brownish-black or black. The first two antennal joints are clay- 

 yellowish; the third joint is dark brown, rather large, short-oval 

 in outline ; arista bare, not incrassated at the basis, black. Oral 

 opening larger than in the preceding species; its transverse 

 diameter comparatively larger; proboscis and palpi short, brown. 

 The very convex thorax and the turgid scutellum are deep black, 

 shining, with a very weak metallic, violet reflection ; the remark- 

 ably broad lateral stripes and the anterior end of the broad middle 

 stripe are bare. The lateral stripes are bordered with coarse, 

 yellowish, stubble-shaped pile, and the posterior two-thirds of the 

 middle stripe, besides being covered with white pollen, are 

 densely beset with similar hairs. The ordinary bristles of the 

 thoracic dorsum are black, and more numerous than usual, as 

 there are four pairs of them along the longitudinal middle line, 

 the anterior pair being inserted immediately in front of the 

 transverse suture. The shining black metathorax has, under the 

 swelling lying immediately under the scutellum, a crossband of 

 thick white pollen. The pleurae show upon the greater part of 

 their upper half, a thin, whitish-gray pollen, and are everywhere 

 beset with stubble-like white hairs. The abdomen seems to be 

 covered everywhere with a thin gray dust, which is somewhat 

 more dense and more whitish-gray upon the posterior border of 

 the single segments ; its rather long stubble-like pile is white. 

 The comparatively long and pointed ovipositor is deep black, 

 shining, and beset with short, fine, black pile. Feet chestnut- 

 brownish. Wings short, rather broad in proportion to their 

 length ; the altogether black venation is very similar to that of 

 the immediately preceding species, except that the comparatively 

 broad marginal cell is divided in two halves by a perpendicular 

 crossvein, which touches the costa at a point perceptibly nearer 



