88 N. H. AGR. EXPERIMENT STATION. [Bulletin 171 



Wings — Length 5 mm., width 2.25 mm. Hyaline, crossed with 

 four dark bands. The first band crosses the wing near the base; 

 the second, third and fourth are confluent anteriorly about the 

 middle of the wing margin, and diverge posteriorly; the second 

 band joins the first at the posterior margin of the wing. Fine 

 pubescence covers the wing, white in hyaline parts and black 

 over bands. 



Abdomen — Black, crossed with four white bands which border 

 the posterior margins of the second, third, fourth and fifth tergites. 

 Abdomen with seven segments, widening from the first to the 

 third, which is broadest, then rapidly narrowing to the seventh, 

 which has the shape of a truncate cone and forms a firm protection 

 for the ovipositor. 



Ovipositor — When not in use, entirely retracted within seventh 

 segment of abdomen. Extended, broadest at base, tapering to 

 a sharp point at tip; horn-like,- brownish; a groove in under sur- 

 face, covered by two flaps extending half-way from base to tip. 

 Sheath of ovipositor thin, with many chitinous projections, the 

 sheath disappearing withing the last abdominal segment when 

 ovipositor is retracted. 



Adult Male. General appearance similar to that of female, 

 but smaller. Length 4.5 mm. 



The markings of head, thorax and wings are identical with those 

 of the female. 



Abdomen — -With seven segments, but apparently with only 

 five because the sixth and seventh are retracted beneath the 

 fifth. White bands border the posterior margins of the second, 

 third and fourth tergites. The sixth segment is unsymmetrical, 

 reduced on the right side. The seventh bears a pair of chitinous 

 appendages. There is a very long, slender, chitinous penis, 

 which is retracted into a pocket beneath the fifth tergite. 



The Egg. Length 1 mm., width .25 mm. Shining white. 

 Obtusely rounded at one end, somewhat tapering at the other. 

 The blunt end provided with a short pedicel. This end covered 

 with a network of ridges forming irregular hexagons, smaller at 

 the end of the egg, larger and more regular toward the middle, 

 becoming faint and gradually disappearing one third to one 

 half away from pedicellate end to pointed end of egg. Pedicellate 

 end of egg slightly darkened. 



