AGRICULTURAL EXPERIMENT STATION. 119 



as well as the short pile of the thoracic dorsum, are black. Meta- 

 thorax distinctlj" infuscated on its superior margin and its middle 

 line. Abdomen shining, with short black pile; the fourth and fifth 

 segments marked by a chestnut brown or black cross band interrupted 

 in the middle, the third usually and sometimes the second segment 

 with a lateral beginning of such a stripe indicated by a chestnut- 

 brown or black spot. Pale specimens Avithout abdominal markings 

 excepting upon the long seventh which in all specimens is dark on 

 the proximate dorsum and at the distal end. Seventh segment equal 

 to the three preceding segments taken together, very broadly trun- 

 cate and infuscated at the end. 



The seventh segment contains the retractile sheath of the oviposi- 

 tor and the ovipositor. The sheath is clyindrical,broadest at the ends. 

 Clothed with retrorse scales arranged in six longitudinal bands at the 

 base which are brownish toward the end and becoming black near 

 the base. Toward the end the scales become smaller and cover the 

 whole surface, and at the middle the six bands are merged into four. 



The ovipositor provided with two guides which are flat, obtuse at 

 the ends and extend three-fourths its length. The ovipositor brown, 

 flat, serrate on the edges, each edge with three teeth. The basal tooth 

 remote. Both faces of the distal lateral teeth each bear two rows 

 of five black bristles. See Plate II. The tip pointed. The principle 

 is that of a double edg'ed serrated hay knife or a Cry sty Bread Knife. 



The front femora are sparsely beset with bristles upon the upper 

 and under side; the middle femora are entirely without bristles; 

 upon the hind femora, likewise, there are only a few bristle-like hairs 

 before the end of the upper side; the upper side of the hind tibiae 

 is merely beset with exceedingly short bristle-like hairs. Wings of 

 the usual shape, hyaline, with a pale-brown picture or in darker 

 specimens nearly black; it consists: 1. In an oblique half cross- 

 band running from the humeral crossvein to the basis of the second 

 basal cell; 2. Of a crossband parallel to the first, abbreviated be- 

 hind, which begins at the stigma, near the anterior margin, and runs 

 across the basis of the submarginal cell, as well as across the cross 

 veins, which close the second and third basal cells, and 

 thus reaches the sixth longitudinal vein; 3. Of a rivulet 

 which begins above the posterior crossvein, near the third 

 longitudinal vein, runs from it across the posterior crossvein 

 as far as the posterior margin, is continued along this margin inside 

 of the third posterior cell, but, before reaching the sixth longitudinal 

 vein, is suddenly turned upwards, running parallel to the band 'which 

 begins at the stigma, crossing the small crossvein, and thus reaching 

 the anterior margin, where, gradually expanding', it forms a border 

 ending a little beyond the tip of the fourth crossvein. The two cross- 

 bands as Avell as the rivulet, are of moderate breadth only; the latter 

 has, in the described specimen, the following faded spots, which, 

 in more fully colored specimens, are probably less apparent or alto- 



